[OpenWrt-Devel] Random data on rootfs_data for tp-wr2543nd-v1 only with ath79

[Chuanhong Guo]

Hi!

On Fri, Feb 7, 2020 at 6:44 AM Luiz Angelo Daros de Luca
<luizluca at gmail.com> wrote:
>
> Hello,
>
> I isolated the problem to be kernel upgrade from 4.14 to 4.19. If I build ath79 with 4.14, it simply works.
> The mtd problem also happens while booting 4.19 without touching the flash 4.19 (using initram image).
>

Flash reading is handled differently between 4.14 and 4.19. 4.14 reads
directly from 0x1f000000 where spi is mapped. But the interface used
for that got removed in 4.19 so bit-bang mode is used instead.
Could you try if removing
target/linux/ath79/patches-4.14/461-spi-ath79-add-fast-flash-read.patch
also breaks ath79/4.14?

Regards,
Chuanhong Guo

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