86 lines
2.7 KiB
Markdown
86 lines
2.7 KiB
Markdown
## Hardware
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System-On-Module used by Helios4 provide an SPI NOR flash [Winbond W25Q32](https://www.winbond.com/hq/product/code-storage-flash-memory/serial-nor-flash/?__locale=en&selected=32Mb#Density) connected to SPI bus 1 Chip Select 0.
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By default, Helios4 configured to boot from microSD card. To boot from SPI NOR flash (after [writing U-Boot into SPI NOR flash](#write-u-boot-to-spi-nor-flash)), please change Boot Mode DIP switch SW1 to:
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## Build U-Boot for SPI NOR flash
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Refer to [U-Boot](/uboot) page to build the image.
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!!! info
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Prebuilt SPI image of U-Boot 2013.01 can be downloaded from [here](/files/software/u-boot-2013.01-spi.bin).
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## Write U-Boot to SPI NOR flash
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### Prerequisites
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1. Access to Helios4 Serial Console. Please refer to [Install](/install/#step-4-connect-to-helios4-serial-console) page for instructions.
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2. Bootable U-Boot on microSD card.
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### Using Linux
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!!! info
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Concurrent access on SPI NOR and SATA drive can lead to unstable SATA. The following instructions has taken this issue into consideration and workaround it by disabling the SATA temporary.
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Put u-boot binaries on home folder and rename it as **u-boot-spi.bin**.
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Download boot_spi_en.scr from [here](/files/software/boot_spi_en.scr) and put it to / and then reboot the system
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```
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sudo wget https://wiki.kobol.io/files/software/boot_spi_en.scr -O /boot_spi_en.scr
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sudo reboot
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```
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Switch to Helios4 serial console. Press any key to cancel the autoboot and execute these commands
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```
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setenv script_name "boot_spi_en.scr"
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stage_boot mmc_scr
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```
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It will boot to Linux with modified device tree.
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- - -
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Log in to Helios4, verify whether mtdblock0 is exist using **lsblk**, and write the u-boot to SPI flash using this command
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```
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sudo dd if=~/u-boot-spi.bin of=/dev/mtdblock0
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```
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Set DIP switches SW1 to SPI Boot
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and reboot the system.
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Observe the boot message on serial console, it should display
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```
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BootROM - 1.73
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Booting from SPI flash
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```
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## Set Up U-Boot
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Add U-Boot ENV variable.
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```
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setenv fdt_high 0xffffffff
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setenv initrd_high 0xffffffff
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setenv fdtfile armada-388-helios4.dtb
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saveenv
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```
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To automatically boot Linux on microSD card
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```
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setenv bootargs '${console} root=/dev/mmcblk0p1 rootwait'
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setenv bootcmd 'ext2load mmc 0:1 ${kernel_addr_r} /boot/zImage; ext2load mmc 0:1 ${ramdisk_addr_r} /boot/uInitrd; ext2load mmc 0:1 ${fdt_addr} /boot/dtb/${fdtfile}; bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr}'
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saveenv
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```
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!!! info
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The prebuilt SPI image has been configured to automatically run /boot/boot.scr and /boot.scr on microSD. There is no need to configure u-boot to boot Armbian on microSD.
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