684 lines
21 KiB
Markdown
684 lines
21 KiB
Markdown
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Helios4 SoC (Armada 388) SDIO controller supports up to UHS-I speed mode.
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Following modes are supported:
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* Default Speed (DS)–up to 25 MHz, 1.8V/3.3V signaling
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* High Speed (HS)–up to 50 MHz, 1.8V/3.3V signaling
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* SDR12–SDR up to 25 MHz, 1.8V/3.3V signaling
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* SDR25–SDR up to 50 MHz, 1.8V/3.3V signaling
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* SDR50–SDR up to 100 MHz, 1.8V signaling
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* DDR50–DDR up to 50 MHz, 1.8V/3.3V signaling
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However, it is not compatible with all cards even though the SD cards are declared as UHS-I capable. To keep it compatible with most of card, Helios4 device tree only define by default [Normal Speed mode](https://www.sdcard.org/consumers/choices/speed_class/index.html).
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!!! Warning
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Enabling High Speed and UHS-I support could lead to unbootable system because of incompatible microSD card.
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!!! Important
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From *Linux Kernel 4.19* onwards, High Speed and UHS-I modes for Helios4 do NOT work. It requires further work on our side.
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## Device Tree Modification
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To enable High Speed mode and UHS-I support, Helios4 device tree need to be modified.
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The following instructions are executed under Helios4.
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### Prerequisites
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* Helios4 Linux Kernel Source Code
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* Build Essentials package
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Install the dependencies and extract the source into ~/src/linux
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```
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sudo apt-get -y install build-essential linux-source-4.14.87-next-mvebu
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mkdir -p ~/src/linux
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tar Jxf /usr/src/linux-source-$(uname -r).tar.xz -C ~/src/linux
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```
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!!! note
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You will need to choose the right *linux-source* package that matches the kernel version you are running. Check kernel version with command **uname -r**.
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### Patching and Compilation
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Download and apply [this patch](/files/sdcard/helios4_dtb_sd_uhs_linux_stable.patch) to Linux kernel source code.
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```
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cd ~/src/linux
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wget https://wiki.kobol.io/files/sdcard/helios4_dtb_sd_uhs_linux_stable.patch
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git apply --apply --verbose helios4_dtb_sd_uhs_linux_stable.patch
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```
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Compile the device tree into dtb
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```
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cp /boot/config-$(uname -r) .config
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make armada-388-helios4.dtb
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cp arch/arm/boot/dts/armada-388-helios4.dtb armada-388-helios4.dtb.uhs
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```
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!!! Info
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Precompiled dtb for Linux kernel 4.14 can be found [here](/files/sdcard/armada-388-helios4.dtb.uhs)
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Copy new dtb to /boot/dtb/, backup the original dtb and create symlink to new dtb
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```
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sudo cp armada-388-helios4.dtb.uhs /boot/dtb/
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cd /boot/dtb/
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sudo cp armada-388-helios4.dtb armada-388-helios4.dtb.ori
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sudo ln -sf armada-388-helios4.dtb.uhs armada-388-helios4.dtb
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```
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Reboot the system.
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## Recovery
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If the system become unbootable after applying modified dtb, recover the system by [connecting to Helios4 serial console](/install/#step-4-connect-to-helios4-serial-console)
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and run following commands
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```
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setenv fdt_addr 0x2040000
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setenv bootargs "console=ttyS0,115200 root=/dev/mmcblk0p1 rootwait rootfstype=ext4 ubootdev=mmc scandelay ignore_loglevel"
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load mmc 0:1 ${fdt_addr} /boot/dtb/armada-388-helios4.dtb.ori
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load mmc 0:1 ${ramdisk_addr_r} /boot/uInitrd
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load mmc 0:1 ${kernel_addr_r} /boot/zImage
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setenv fdt_high 0xffffffff
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setenv initrd_high 0xffffffff
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bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr}
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```
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After successfully boot to Linux, restore the original dtb and remove the modified one.
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```
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sudo mv -f /boot/dtb/armada-388-helios4.dtb.ori /boot/dtb/armada-388-helios4.dtb
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sudo rm /boot/dtb/armada-388-helios4.dtb.uhs
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```
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## Performance Testing
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The test methodology is adapted from
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[SD card performance - Research guides & tutorials - Armbian forum](https://forum.armbian.com/topic/954-sd-card-performance/)
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with slightly modified parameter to run the test on SD card mounted under /mnt/sdcard.
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```
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iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 -f /mnt/sdcard/iozone-test.dat
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```
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To automate the test, a test script named [run_sdcard_test.sh](/files/sdcard/run_sdcard_test.sh) was created.
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### Test Procedure
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**1.** Prepare the system to boot from SPI and Rootfs located on USB drive. See [SPI (NOR Flash) page](/spi/).
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**2.** Build and replace Helios4 dtb as instructed in [Device Tree Modification](#device-tree-modification).
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**3.** Install iozone and download the test script
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```
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sudo apt-get -y install iozone3
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wget https://wiki.kobol.io/files/sdcard/run_sdcard_test.sh
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chmod 755 run_sdcard_test.sh
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```
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**4.** Override kernel loglevel on every boot
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```
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sudo sed -i 's/^exit 0/dmesg -n 8\nexit 0/g' /etc/rc.local
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```
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**5.** Make sure armada-388-helios4.dtb points to armada-388-helios4.dtb.uhs
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```
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cd /boot/dtb/
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sudo ln -sf armada-388-helios4.dtb.uhs armada-388-helios4.dtb
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```
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**6.** Reboot and cancel U-Boot autoboot.
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**7.** Read SD card info and boot to Linux
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```
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mmc rescan
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mmc info
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bootd
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```
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**8.** Observe whether any error/warning on sd card detection in console and check whether sdcard is detected.
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```
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dmesg | grep "mmc"
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lsblk
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```
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**9.** Run the test script
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```
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sudo ./run_sdcard_test.sh
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```
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The test script will display the test progress and log result into log file : *SD_test_**<sdcard_address\>**\_[**<sdcard_name\>**]\_**<date_in_YYYYMMDD_HHMMSS\>**.log*
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Example filename: SD_test_mmc0:aaaa-[SU08G]_20181212_034241.log
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If the SD card is not detected, the test script would exit without saving any log file.
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**10.** Change armada-388-helios4.dtb to point back to armada-388-helios4.dtb.ori
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```
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cd /boot/dtb/
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sudo ln -sf armada-388-helios4.dtb.ori armada-388-helios4.dtb
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```
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**11.** Repeat step **6** until **9** to test in Normal Speed mode.
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**12.** Repeat step **5** until **11** for other card.
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**13.** Remove kernel loglevel override done in step **4**.
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```
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sudo sed -i '/^dmesg -n 8/d' /etc/rc.local
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```
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### Tested MicroSD Card
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Below a non-exhaustive list of microSD Card models that we tested to check compatibility with UHS-I speed mode. We will keep populating this list with new microSD Card models.
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| **MicroSD Card Model** | **UHS-I Compatibility Result** |
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|--------------------|----------------|
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| [Kingston Mobile Card microSDHC (16GB)](#kingston-mobile-card-microsdhc-16gb)|not compatible|
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| [Samsung microSDHC UHS-I Card EVO Plus (32GB)](#samsung-microsdhc-uhs-i-card-evo-plus-32gb)|**yes, but no performance improvement if used as boot drive**|
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| [SanDisk Extreme microSDHC UHS-I Card (32GB)](#sandisk-extreme-microsdhc-uhs-i-card-32gb)|**yes, performance boosted**|
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| [SanDisk Extreme PRO microSDHC UHS-I Card (32GB)](#sandisk-extreme-pro-microsdhc-uhs-i-card-32gb)|**yes, performance boosted**|
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| [SanDisk Ultra microSD UHS-I Card (32GB)](#sandisk-ultra-microsd-uhs-i-card-32gb)|**yes, but no performance improvement**|
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| [SanDisk Ultra microSD UHS-I Card (16GB)](#sandisk-ultra-microsd-uhs-i-card-16gb)|not compatible|
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| [SanDisk Ultra microSD UHS-I Card 48MBps (16GB)](#sandisk-ultra-microsd-uhs-i-card-48mbps-16gb)|not compatible|
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| [SanDisk Ultra microSD UHS-I Card 30MBps (8GB)](#sandisk-ultra-microsd-uhs-i-card-30mbps-8gb)|**yes, but no performance improvement**|
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| [Strontium Nitro MicroSD Card (16GB)](#strontium-nitro-microsd-card-16gb)|**yes, performance boosted**|
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| [Toshiba MicroSD Exceria Pro (16GB)](#toshiba-microsd-exceria-pro-16gb)|not compatible|
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| [Transcend microSDHC Premium (8GB)](#transcend-microsdhc-premium-8gb)|**yes, but no performance improvement**|
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#### Kingston Mobile Card microSDHC (16GB)
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*Specifications*
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| | |
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| -----|------|
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| Product Page | [https://www.kingston.com/en/flash/microsd_cards/sdc10g2](https://www.kingston.com/en/flash/microsd_cards/sdc10g2) |
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| Manufacture Id | 0x00009f |
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| OEM ID | 0x5449 |
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| Product Name | SD16G |
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| HW Revision | 0x3 |
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| FW Revision | 0x0 |
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| Serial Number | 0x5b3003c7 |
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| Manufacture Date | 07/2018 |
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| Capacity Standard | SDHC |
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| SD version* | 1.0 |
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| Mode* | SD Legacy |
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| Bus Speed* | 25000000 |
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| Bus Width* | 4-bit |
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!!! Notes
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* Value taken from U-Boot "mmc info".
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*Test Result* : Failed!
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```
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mmc0: new SDHC card at address 0001
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mmcblk0: mmc0:0001 SD16G 14.6 GiB
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mmcblk0: p1
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```
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The card was detected by Linux but when the test runnning, kernel console constantly emits
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```
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mmcblk0: error -110 transferring data, sector 2433024, nr 1024, cmd response 0x900, card status 0xb00
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mmcblk0: retrying using single block read
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mmc0: Timeout waiting for hardware interrupt.
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mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
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mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00000202
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mmc0: sdhci: Blk size: 0x00007200 | Blk cnt: 0x00000030
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mmc0: sdhci: Argument: 0x00252400 | Trn mode: 0x00000033
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mmc0: sdhci: Present: 0x01e70206 | Host ctl: 0x00000011
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mmc0: sdhci: Power: 0x0000000f | Blk gap: 0x00000000
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mmc0: sdhci: Wake-up: 0x00000000 | Clock: 0x0000fa07
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mmc0: sdhci: Timeout: 0x00000003 | Int stat: 0x00000000
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mmc0: sdhci: Int enab: 0x02ff008b | Sig enab: 0x02ff008b
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mmc0: sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
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mmc0: sdhci: Caps: 0x25fcc8b2 | Caps_1: 0x00002f77
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mmc0: sdhci: Cmd: 0x0000123a | Max curr: 0x00000000
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mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x47305b30
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mmc0: sdhci: Resp[2]: 0x53443136 | Resp[3]: 0x009f5449
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mmc0: sdhci: Host ctl2: 0x00000008
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mmc0: sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x7f0b95d0
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mmc0: sdhci: ============================================
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mmcblk0: error -110 transferring data, sector 2434048, nr 1024, cmd response 0x900, card status 0xb00
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mmc0: Timeout waiting for hardware interrupt.
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```
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And the still did not finished the test after 8 hours.
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---
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#### Samsung microSDHC UHS-I Card EVO Plus (32GB)
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*Specifications*
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| | |
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| -----|------|
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| Product Page | [https://www.samsung.com/us/computing/memory-storage/memory-cards/microsdhc-evo-plus-memory-card-w--adapter-32gb--2017-model--mb-mc32ga-am/](https://www.samsung.com/us/computing/memory-storage/memory-cards/microsdhc-evo-plus-memory-card-w--adapter-32gb--2017-model--mb-mc32ga-am/) |
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| Manufacture Id | 0x00001b |
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| OEM ID | 0x534d |
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| Product Name | EB1QT |
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| HW Revision | 0x3 |
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| FW Revision | 0x0 |
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| Serial Number | 0x6d4061eb |
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| Manufacture Date | 06/2018 |
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| Capacity Standard | SDHC |
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| SD version* | 3.0 |
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| Mode* | SD High Speed (50MHz) |
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| Bus Speed* | 50000000 |
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| Bus Width* | 4-bit |
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!!! Notes
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* Value taken from U-Boot "mmc info".
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*Test Result*
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```
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[ 3.428116] mmc0: new high speed SDHC card at address 0001
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[ 3.434040] mmcblk0: mmc0:0001 EB1QT 29.8 GiB
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[ 3.517590] mmcblk0: p1
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[ 48.452996] mmc0: card 0001 removed
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[ 50.155681] mmc0: new ultra high speed DDR50 SDHC card at address 0001
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[ 50.162494] mmcblk0: mmc0:0001 EB1QT 29.8 GiB
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[ 50.169200] mmcblk0: p1
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```
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Card speed stays at high speed during boot up while other UHS-I compatible card switched to ultra high speed.
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It only changed to ultra high speed after remove and reinsert the card.
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If the card is used as boot/system drive, it is not allowed to be removed during runtime therefore no performance gain since the speed stays at high speed.
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---
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#### SanDisk Extreme microSDHC UHS-I Card (32GB)
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*Specifications*
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| | |
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| -----|------|
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| Product Page | [https://www.sandisk.com/home/memory-cards/microsd-cards/extreme-microsd](https://www.sandisk.com/home/memory-cards/microsd-cards/extreme-microsd) |
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| Manufacture Id | 0x000003 |
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| OEM ID | 0x5344 |
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| Product Name | SM32G |
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| HW Revision | 0x8 |
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| FW Revision | 0x0 |
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| Serial Number | 0x4313d13b |
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| Manufacture Date | 10/2018 |
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| Capacity Standard | SDHC |
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| SD version* | 3.0 |
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| Mode* | SD High Speed (50MHz) |
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| Bus Speed* | 50000000 |
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| Bus Width* | 4-bit |
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!!! Notes
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* Value taken from U-Boot "mmc info".
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*Test Result*
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```
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mmc0: new ultra high speed DDR50 SDHC card at address aaaa
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mmcblk0: mmc0:aaaa SM32G 29.7 GiB
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mmcblk0: p1
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```
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---
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#### SanDisk Extreme PRO microSDHC UHS-I Card (32GB)
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*Specifications*
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| | |
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| -----|------|
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| Product Page | [https://www.sandisk.com/home/memory-cards/microsd-cards/extremepro-microsd](https://www.sandisk.com/home/memory-cards/microsd-cards/extremepro-microsd) |
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| Manufacture Id | 0x000003 |
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| OEM ID | 0x5344 |
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| Product Name | SP32G |
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| HW Revision | 0x8 |
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| FW Revision | 0x0 |
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| Serial Number | 0x122a8270 |
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| Manufacture Date | 10/2017 |
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| Capacity Standard | SDHC |
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| SD version* | 3.0 |
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| Mode* | SD High Speed (50MHz) |
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| Bus Speed* | 50000000 |
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| Bus Width* | 4-bit |
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!!! Notes
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* Value taken from U-Boot "mmc info".
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*Test Result*
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```
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mmc0: new ultra high speed DDR50 SDHC card at address e624
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mmcblk0: mmc0:e624 SP32G 29.7 GiB
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mmcblk0: p1
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```
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---
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#### SanDisk Ultra microSD UHS-I Card (32GB)
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*Specifications*
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| | |
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| -----|------|
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| Product Page | [https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-for-smartphones](https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-for-smartphones) |
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| Manufacture Id | 0x000003 |
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| OEM ID | 0x5344 |
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| Product Name | SL32G |
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| HW Revision | 0x8 |
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| FW Revision | 0x0 |
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| Serial Number | 0x0c9daa71 |
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| Manufacture Date | 04/2014 |
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| Capacity Standard | SDHC |
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| SD version* | 3.0 |
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| Mode* | SD High Speed (50MHz) |
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| Bus Speed* | 50000000 |
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| Bus Width* | 4-bit |
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!!! Notes
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* Value taken from U-Boot "mmc info".
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*Test Result*
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```
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mmc0: new ultra high speed DDR50 SDHC card at address aaaa
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mmcblk0: mmc0:aaaa SL32G 29.7 GiB
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mmcblk0: p1
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mmc0: Tuning failed, falling back to fixed sampling clock
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mmcblk0: error -84 transferring data, sector 62333824, nr 8, cmd response 0x900, card status 0xb00
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```
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Even though there are some errors, the test finished without much improvement.
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---
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#### SanDisk Ultra microSD UHS-I Card (16GB)
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|
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*Specifications*
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|
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| | |
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| -----|------|
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| Product Page | [https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-for-smartphones](https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-for-smartphones) |
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| Manufacture Id | 0x000003 |
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| OEM ID | 0x5344 |
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| Product Name | SL16G |
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| HW Revision | 0x8 |
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| FW Revision | 0x0 |
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| Serial Number | 0xa5253c77 |
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| Manufacture Date | 04/2017 |
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| Capacity Standard | SDHC |
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| SD version* | 3.0 |
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| Mode* | SD High Speed (50MHz) |
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| Bus Speed* | 50000000 |
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| Bus Width* | 4-bit |
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!!! Notes
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* Value taken from U-Boot "mmc info".
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*Test Result* : Failed!
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```
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mmc0: new ultra high speed DDR50 SDHC card at address aaaa
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mmcblk0: mmc0:aaaa SL16G 14.8 GiB
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||
mmcblk0: error -84 sending status command, retrying
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmcblk0: error -84 sending status command, retrying
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmcblk0: error -84 sending status command, aborting
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmcblk0: unable to read partition table
|
||
mmc0: card aaaa removed
|
||
mmc0: new high speed SDHC card at address aaaa
|
||
mmcblk0: mmc0:aaaa SL16G 14.8 GiB
|
||
mmcblk0: error -84 sending status command, retrying
|
||
mmcblk0: error -84 sending stop command, original cmd response 0x900, card status 0x900
|
||
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0
|
||
mmcblk0: error -84 sending stop command, original cmd response 0x900, card status 0x900
|
||
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0
|
||
```
|
||
|
||
The card was not detected by Linux.
|
||
|
||
---
|
||
|
||
#### SanDisk Ultra microSD UHS-I Card 48MBps (16GB)
|
||
|
||
|
||
|
||
*Specifications*
|
||
|
||
| | |
|
||
| -----|------|
|
||
| Product Page | [https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-48mbs](https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-48mbs) |
|
||
| Manufacture Id | 0x000003 |
|
||
| OEM ID | 0x5344 |
|
||
| Product Name | SL16G |
|
||
| HW Revision | 0x8 |
|
||
| FW Revision | 0x0 |
|
||
| Serial Number | 0x349f2b91 |
|
||
| Manufacture Date | 01/2016 |
|
||
| Capacity Standard | SDHC |
|
||
| SD version* | 3.0 |
|
||
| Mode* | SD High Speed (50MHz) |
|
||
| Bus Speed* | 50000000 |
|
||
| Bus Width* | 4-bit |
|
||
|
||
!!! Notes
|
||
* Value taken from U-Boot "mmc info".
|
||
|
||
*Test Result* : Failed!
|
||
|
||
```
|
||
mmc0: new ultra high speed DDR50 SDHC card at address aaaa
|
||
mmcblk0: mmc0:aaaa SL16G 14.8 GiB
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
|
||
mmcblk0: p1
|
||
mmcblk0: error -84 transferring data, sector 10240, nr 8, cmd response 0x900, card status 0xb00
|
||
mmcblk0: error -84 transferring data, sector 8784, nr 72, cmd response 0x900, card status 0xb00
|
||
mmcblk0: error -84 transferring data, sector 8784, nr 72, cmd response 0x900, card status 0xb00
|
||
mmcblk0: retrying using single block read
|
||
mmcblk0: error -84 transferring data, sector 8856, nr 360, cmd response 0x900, card status 0xb00
|
||
mmcblk0: error -84 transferring data, sector 8856, nr 360, cmd response 0x900, card status 0xb00
|
||
```
|
||
|
||
The card was not detected by Linux.
|
||
|
||
---
|
||
|
||
#### SanDisk Ultra microSD UHS-I Card 30MBps (8GB)
|
||
|
||
|
||
|
||
*Specifications*
|
||
|
||
| | |
|
||
| -----|------|
|
||
| Product Page | [https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-for-smartphones](https://www.sandisk.com/home/memory-cards/microsd-cards/ultra-microsd-for-smartphones) |
|
||
| Manufacture Id | 0x000003 |
|
||
| OEM ID | 0x5344 |
|
||
| Product Name | SU08G |
|
||
| HW Revision | 0x8 |
|
||
| FW Revision | 0x0 |
|
||
| Serial Number | 0x2369e07f |
|
||
| Manufacture Date | 12/2013 |
|
||
| Capacity Standard | SDHC |
|
||
| SD version* | 3.0 |
|
||
| Mode* | SD High Speed (50MHz) |
|
||
| Bus Speed* | 50000000 |
|
||
| Bus Width* | 4-bit |
|
||
|
||
!!! Notes
|
||
* Value taken from U-Boot "mmc info".
|
||
|
||
*Test Result*
|
||
|
||
```
|
||
mmc0: new ultra high speed DDR50 SDHC card at address aaaa
|
||
mmcblk0: mmc0:aaaa SU08G 7.40 GiB
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
|
||
mmcblk0: p1
|
||
```
|
||
|
||
Even though there are some errors, the test finished. Many of test cases see performance reduction.
|
||
|
||
|
||
|
||
---
|
||
|
||
#### Strontium Nitro MicroSD Card (16GB)
|
||
|
||
|
||
|
||
*Specifications*
|
||
|
||
| | |
|
||
| -----|------|
|
||
| Product Page | [http://www.strontium.biz/products/memory-cards/mobile-memory-cards/#seven](http://www.strontium.biz/products/memory-cards/mobile-memory-cards/#seven) |
|
||
| Manufacture Id | 0x000084 |
|
||
| OEM ID | 0x5446 |
|
||
| Product Name | SD |
|
||
| HW Revision | 0x0 |
|
||
| FW Revision | 0x0 |
|
||
| Serial Number | 0x954b266b |
|
||
| Manufacture Date | 09/2016 |
|
||
| Capacity Standard | SDHC |
|
||
| SD version* | 3.0 |
|
||
| Mode* | SD High Speed (50MHz) |
|
||
| Bus Speed* | 50000000 |
|
||
| Bus Width* | 1-bit |
|
||
|
||
!!! Notes
|
||
* Value taken from U-Boot "mmc info".
|
||
|
||
*Test Result*
|
||
|
||
```
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmc0: new ultra high speed DDR50 SDHC card at address 0001
|
||
mmcblk0: mmc0:0001 SD 14.6 GiB
|
||
mmcblk0: p1
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
mmc0: Tuning failed, falling back to fixed sampling clock
|
||
```
|
||
|
||
Even though there are some warnings, the test finished.
|
||
|
||
|
||
|
||
---
|
||
|
||
#### Toshiba MicroSD Exceria Pro (16GB)
|
||
|
||
|
||
|
||
|
||
*Specifications*
|
||
|
||
| | |
|
||
| -----|------|
|
||
| Product Page | [https://www.toshiba-memory.com/products/toshiba-microsd-cards-exceria-pro-m401/](https://www.toshiba-memory.com/products/toshiba-microsd-cards-exceria-pro-m401/) |
|
||
| Manufacture Id | 0x000002 |
|
||
| OEM ID | 0x544d |
|
||
| Product Name | UC0C5 |
|
||
| HW Revision | 0x5 |
|
||
| FW Revision | 0x0 |
|
||
| Serial Number | 0xd2a0e6a3 |
|
||
| Manufacture Date | 11/2016 |
|
||
| Capacity Standard | SDHC |
|
||
| SD version* | 3.0 |
|
||
| Mode* | SD High Speed (50MHz) |
|
||
| Bus Speed* | 50000000 |
|
||
| Bus Width* | 4-bit |
|
||
|
||
!!! Notes
|
||
* Value taken from U-Boot "mmc info".
|
||
|
||
*Test Result* : Failed!
|
||
|
||
```
|
||
mmc0: error -84 whilst initialising SD card
|
||
```
|
||
|
||
The card was not detected by Linux.
|
||
|
||
---
|
||
|
||
#### Transcend microSDHC Premium (8GB)
|
||
|
||
|
||
|
||
*Specifications*
|
||
|
||
| | |
|
||
| -----|------|
|
||
| Product Page | [https://www.transcend-info.com/Products/No-320](https://www.transcend-info.com/Products/No-320) |
|
||
| Manufacture Id | 0x000074 |
|
||
| OEM ID | 0x4a45 |
|
||
| Product Name | USD |
|
||
| HW Revision | 0x1 |
|
||
| FW Revision | 0x0 |
|
||
| Serial Number | 0x4568e585 |
|
||
| Manufacture Date | 06/2014 |
|
||
| Capacity Standard | SDHC |
|
||
| SD version* | 3.0 |
|
||
| Mode* | SD High Speed (50MHz) |
|
||
| Bus Speed* | 50000000 |
|
||
| Bus Width* | 1-bit |
|
||
|
||
*Test Result*
|
||
|
||
```
|
||
mmc0: new high speed SDHC card at address b368
|
||
mmcblk0: mmc0:b368 USD 7.45 GiB
|
||
mmcblk0: p1
|
||
```
|
||
|
||
|
||
|
||
---
|
||
|
||
**Value taken from U-Boot "mmc info"*
|