[LEDE-DEV] [openwrt/openwrt] ar71xx: Ubiquiti Airmax M: add relocate-kernel to invalidate cache

[Etienne Champetier]

Hi Matthias,

2018-04-26 11:43 GMT-07:00 LEDE Commits <lede-commits at lists.infradead.org>:
> neoraider pushed a commit to openwrt/openwrt.git, branch lede-17.01:
> https://git.lede-project.org/eed9d40133fe6468cc253d0345c7d7332d2aaa7c
>
> commit eed9d40133fe6468cc253d0345c7d7332d2aaa7c
> Author: Matthias Schiffer <mschiffer at universe-factory.net>
> AuthorDate: Thu Apr 26 20:04:48 2018 +0200
>
>     ar71xx: Ubiquiti Airmax M: add relocate-kernel to invalidate cache
>
>     Some Ubiquiti U-boot versions, in particular the "U-Boot 1.1.4.2-s956
>     (Jun 10 2015 - 10:54:50)" found with AirOS 5.6, do not correctly flush the
>     caches for the whole kernel address range after decompressing the kernel
>     image, leading to hard to debug boot failures, depending on kernel version
>     and configuration.
>
>     As a workaround, prepend the relocate-kernels loader, which will invalidate
>     the caches after moving the kernel to the correct load address.

So if I understand correctly,
with this commit I don't need to downgrade my bullet M to v.5.5.10
(U-Boot 1.1.4.2-s594 (Dec  5 2012 - 15:23:07))
and I can just downgrade to v.5.6.x (U-Boot 1.1.4.2-s956 (Jun 10 2015
- 10:54:50)) and maybe even the firsts 6.0.X (without the signed
image)

mtdparts differences between the 2 uboot version:
https://community.ubnt.com/t5/airOS-SDK-Custom-Development/5-6-2-TFTP-ERROR/m-p/1310208/highlight/true#M2354

Thanks
Etienne

>
>     Reported-by: Andreas Ziegler <dev at andreas-ziegler.de>
>     Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
> ---
>  target/linux/ar71xx/image/ubnt.mk | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/target/linux/ar71xx/image/ubnt.mk b/target/linux/ar71xx/image/ubnt.mk
> index 65ed708..899d5d0 100644
> --- a/target/linux/ar71xx/image/ubnt.mk
> +++ b/target/linux/ar71xx/image/ubnt.mk
> @@ -47,6 +47,7 @@ define Device/ubnt-xm
>    UBNT_TYPE := XM
>    UBNT_BOARD := XM
>    UBNT_CHIP := ar7240
> +  KERNEL := kernel-bin | patch-cmdline | relocate-kernel | lzma | uImage lzma
>    IMAGES := sysupgrade.bin factory.bin
>    IMAGE/factory.bin = $$(IMAGE/sysupgrade.bin) | mkubntimage-split
>    IMAGE/sysupgrade.bin = append-kernel | pad-to $$$$(BLOCKSIZE) | append-rootfs | pad-rootfs | check-size $$$$(IMAGE_SIZE)
>
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