[OpenWrt-Devel] ath79: NAND bad eraseblocks in MikroTik RouterBOARD 922UAGS-5HPacD

[Michal Cieslakiewicz]

On Wed, 29 Jan 2020 17:40:43 +0100
"Roger Pueyo Centelles | Guifi.net via openwrt-devel"
<openwrt-devel at lists.openwrt.org> wrote:

> Hi all,
>
> It seems like the NAND flash is read with different endiannesses:
>
> [...]
> 
> I wonder, though, which is the "correct" one --or how to change
> ath79's, so that it is coherent with the previous target--.
> 
> Roger
>

Hello Roger,

Please try adding 'qca,nand-swap-dma;' to '&nand' section in
router dts file. This in theory should fix endianness problem.

Explanation:
In ar71xx target this router is initialized by file
target/linux/ar71xx/files/arch/mips/ath79/mach-rb922.c. 
NAND controller setup is located in function rb922gs_nand_init(), there
'ath79_nfc_set_swap_dma(true)' is invoked. In ath79 device tree
such byte-swapping is enabled by setting 'qca,nand-swap-dma'.

By looking at C file, I have also found that this router uses
model-specific ath79_nfc_set_scan_fixup() routine - a functionality
that is not implemented in ath79, because there was no need for such
quirks, at least not until now.

Best regards
Michal

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