This is the boot on the vendor legacy code - OpenWrt 18.06ish, with kernel
4.14.131, with probably a bunch of their customizations, but:
[ 9.398860] [NAND]select ecc bit:12, sparesize :112 spare_per_sector=28
[ 9.412077] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
[ 9.424719] nand: Macronix NAND 128MiB 3,3V 8-bit
[ 9.434084] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB
size: 32
But under 5.10 on 22.03 (I also tried 5.15 with current development, but that
has unrelated issues):
[ 16.071380] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
[ 16.084185] nand: Macronix MX30LF1G28AD
[ 16.091826] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB
size: 128
[ 16.107083] mt7621-nand 1e003000.nand: ECC strength adjusted to 12 bits
[ 16.163318] 8 fixed-partitions partitions found on MTD device mt7621-nand
Suffice to that accessing the device (nanddump) does not go well.
I did look around the code, and in particular at the nand_onfi.c code,
where the OOB is set based upon various metrics. I tried hard wiring
here to 32, but this caused other problems with ECC determination.
It turns out the legacy code actually uses a whole other driver:
/******************************************************************************
* mtk_nand2.c - MTK NAND Flash Device Driver
*
* Copyright 2009-2012 MediaTek Co.,Ltd.
Suffice to say it does not build under current kernels, even with some
attempts in this direction.
What should I be looking at here - I can put some debug/queries under the legacy
code if need be, but clearly the current code needs to be updated to support
this. I haven't looked at the datasheet yet for this part, but probably
I should do.
Many thanks.
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