NAND ECC errors after flashing from 4.9.11 kernel

mihaitaivascu — Mon, 08 Apr 2019 14:18:01 GMT

Hello,

I have the following issues when booting the barebox after I have flashed a new image on nand from Linux using UBI FS tools: ubiformat, ubiattach, etc

Board: Phytec phyCORE-i.MX6 Ultra Lite SOM
detected i.MX6 UltraLite revision 1.1
mdio_bus: miibus0: probed
eth0: got preset MAC address: 50:2d:f4:10:d2:69
nand: ONFI flash detected
nand: NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron MT29F4G08ABADAH4), 512MiB, page size: 2048, OOB size: 64
Bad block table found at page 262080, version 0x01
Bad block table found at page 262016, version 0x01
nand_bbt: ECC error in BBT at 0x00001ffe0005
nand_bbt: ECC error in BBT at 0x00001ffc0005
Scanning device for bad blocks
Bad block table written to 0x00001ffe0000, version 0x01
Bad block table written to 0x00001ffc0000, version 0x01
imx-usb 2184200.usb: USB EHCI 1.00
imx-esdhc 2190000.usdhc: registered as 2190000.usdhc
netconsole: registered as netconsole-1
phySOM-i.MX6: Using environment in NAND flash
malloc space: 0x8fe7d300 -> 0x9fcfa5ff (size 254.5 MiB)
running /env/bin/init...

nand0.fit1: error -74 (ECC error) while reading 64 bytes from PEB 797:0
nand0.fit1: error -74 (ECC error) while reading 64 bytes from PEB 798:0
nand0.fit1: error -74 (ECC error) while reading 64 bytes from PEB 799:0
ubi0: scanning is finished
nand0.fit1: error -74 (ECC error) while reading 22528 bytes from PEB 232:4096
nand0.fit1: error -74 (ECC error) while reading 22528 bytes from PEB 233:4096
ubi0 error: vtbl_check: bad CRC at record 0: 0xa38af6d6, not 0x4d272fba
Volume table record 0 dump:
reserved_pebs 579
alignment 1
data_pad 0
vol_type 2
upd_marker 0
name_len 3
name fit
crc 0x4d272fba
ubi0 error: vtbl_check: bad CRC at record 0: 0xa38af6d6, not 0x4d272fba
Volume table record 0 dump:
reserved_pebs 579
alignment 1
data_pad 0
vol_type 2
upd_marker 0
name_len 3
name fit
crc 0x4d272fba
ubi0 error: process_lvol: both volume tables are corrupted
ubi0 error: ubi_attach_mtd_dev: failed to attach mtd0, error -22
failed to attach: Invalid argument

Both barebox and linux use flash based BBT, I have enabled Software BCH ECC in both barebox and linux.

This happens only after I update the nand partiotions from linux.

If I do it from barebox, evrtything is ok.

The device tree in abrebox and linux is the same in regard to nand partition table.

I use barebox 2018.04 and 4.9.11 NXP kernel on an imx6ul platform

Does anybody know what possible reasons could be other than a hw or sw driver bug?

Thanks,

Mihaita

Re: NAND ECC errors after flashing from 4.9.11 kernel

b36401 — Tue, 09 Apr 2019 05:19:33 GMT

It seems MT29F4G08ABADAH4 NAND chip driver in new kernel is differ than in old one in point of ECC calculation.
So you need to re-format NAND structure with kobs-ng.

Alternativelly you can try to compile the driver from old kernel in new one.

Re: NAND ECC errors after flashing from 4.9.11 kernel

mihaitaivascu — Tue, 09 Apr 2019 08:48:10 GMT

Hello,

Thanks for your reply. It seems that downporting the gpmi driver to 4.8 was the solution.

Re: NAND ECC errors after flashing from 4.9.11 kernel

steveschefterti — Tue, 16 Apr 2019 15:50:08 GMT

I am using u-boot rather than barebox, but I expect the issue is the same. You can force the gpmi-nand driver in Linux to use a backward compatible ECC by adding the following to gpmi-nand in the device tree:

fsl,legacy-bch-geometry;

Note the cautions in the Linux kernel code about this being a less safe ECC.

i.MX ProcessorsのトピックRe: NAND ECC errors after flashing from 4.9.11 kernel

NAND ECC errors after flashing from 4.9.11 kernel

Re: NAND ECC errors after flashing from 4.9.11 kernel

Re: NAND ECC errors after flashing from 4.9.11 kernel

Re: NAND ECC errors after flashing from 4.9.11 kernel