2013/12/4 Enric Balletbo Serra <eballe...@gmail.com>: > Dear Pekon, > > I'm trying to enable the support for BCH8 for platforms that do not > have ELM hardware engine. Maybe I'm missing something but my first and > quick attempt was applying the following patch: > > http://pastebin.com/VUjuGChR > > With this patch I'm able to switch to > OMAP_ECC_BCH8_CODE_HW_DETECTION_SW with the nandecc hw bch8 command. > > Then I tried to flash a ubi rootfs into the nand, but the kernel can't > mount the filesystem, I see messages like that: > > [ 3.703582] ecc unrecoverable error > [ 3.707244] UBI warning: ubi_io_read: error -74 (ECC error) while > reading 64 bytes from PEB 2:0, read only 64 bytes, retry > > OTOH, if I flash the rootfs from the kernel (my board sets the ecc to > bch8) I don't have any problem, I can mount without problems. > > I saw that the OOB layout is not the same when I flash the rootfs from > the u-boot or from the kernel. For example: > > If the rootfs is flashed from the kernel the OOB data is like that: > > U-Boot # nand dump.oob 0x680000 > Page 00680000 dump: > OOB: > ff ff 79 43 68 64 3b 80 > b2 46 49 4d 58 2a 6d ff > 52 3f 7d 2a 7f a2 98 70 > 57 32 30 35 c7 ff ff ff > ff ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff > > If the rootfs is flashed for the u-boot the OOB data is like data: > > Page 00680000 dump: > OOB: > ff ff 79 43 68 64 3b 80 > b2 46 49 4d 58 2a 6d 52 > 3f 7d 2a 7f a2 98 70 57 > 32 30 35 c7 ff ff ff ff > ff ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff > > Note that look the same except after byte number 16. In the first case is > ff 52 3f 7d 2a 7f a2 98 70 > and in the second case is > 52 3f 7d 2a 7f a2 98 70 > > It's possible that something is wrong writting the OOB data ? Any clue > ? I'm in the right direction or completely wrong ? > > Thanks in advance, > Enric
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