[PATCH 1/2] ramips: mt7621: Add Arcadyan WE420223-99 support

[Harm Berntsen]

On Wed, 2022-12-28 at 00:11 +0100, Rafał Miłecki wrote:
> On 15.08.2022 12:30, Harm Berntsen via openwrt-devel wrote:
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> (...)
> 
>  > 5. Ensure the bootpartition variable is set to 0 in the U-Boot
>  >    environment located at 0x30000
> 
> There should be really a Linux parser picking the correct set of
> partitions. Such limitations make behaviour too much unpredictable if
> not making it possible to brick a device.

Thanks for your feedback!

The fw_setenv tool from U-Boot can parse this format. My patch includes
a uboot-envtools addition to make this change easy to do from OpenWrt
initramfs. On the Wiki I also described the flashing process using a
Raspberry Pi [1], also using fw_setenv. 

Although the bootloader supports A/B partitioning, my patch reduces to
a single big A setup (for more storage space), so the only valid
setting is bootpartition=0. Note that bootpartition=1 can be made to
work, that would require changing the partition layout in the .dts and
kernel boot parameters. 

I think there is little risk in bricking as the steps currently require
you to directly connect to the flash chip. Once you can do that,
creating/restoring back-ups is trivial.

[1]
https://openwrt.org/inbox/toh/arcadyan/astoria/we420223-99#flashing_openwrt