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Reword important note on UHS support from LK 4.19 onwards.

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Gauthier Provost 2019-07-27 11:28:47 +08:00
parent 6723446e26
commit e20d3f7f1c
1 changed files with 3 additions and 3 deletions
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docs/sdcard.md
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@ -15,6 +15,9 @@ However, it is not compatible with all cards even though the SD cards are declar
!!! Warning !!! Warning
Enabling High Speed and UHS-I support could lead to unbootable system because of incompatible microSD card. Enabling High Speed and UHS-I support could lead to unbootable system because of incompatible microSD card.
!!! Important
From *Linux Kernel 4.19* onwards, High Speed and UHS-I modes for Helios4 do NOT work. It requires further work on our side.
## Device Tree Modification ## Device Tree Modification
To enable High Speed mode and UHS-I support, Helios4 device tree need to be modified. To enable High Speed mode and UHS-I support, Helios4 device tree need to be modified.
@ -36,9 +39,6 @@ tar Jxf /usr/src/linux-source-$(uname -r).tar.xz -C ~/src/linux
!!! note !!! note
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**. 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**.
Currently it does NOT work with *Linux Kernel 4.19* onward.
### Patching and Compilation ### Patching and Compilation
Download and apply [this patch](/files/sdcard/helios4_dtb_sd_uhs_linux_stable.patch) to Linux kernel source code. Download and apply [this patch](/files/sdcard/helios4_dtb_sd_uhs_linux_stable.patch) to Linux kernel source code.