On 2/11/23 08:10, Chuanhong Guo wrote:
Hi!
# nanddump -a /dev/mtd2
ECC failed: 8
ECC corrected: 0
Number of bad blocks: 0
Number of bbt blocks: 0
Block size 131072, page size 2048, OOB size 128
Dumping data starting at 0x00000000 and ending at 0x00040000...
libmtd: error!: MEMGETBADBLOCK ioctl failed for eraseblock 0 (mtd2)
error 77 (Bad message)
nanddump: error!: libmtd: mtd_is_bad
I haven't been able to find anything on what this error means in practice.
You could try printing the spare size and ecc strength used in the
old driver, replacing the calculation in the new driver with
hard-coded values and see if that works. If it works, you can
implement the ecc strength override in our driver.
Thanks. I'm not real familiar with this, so it's slow going. I'm sure the
answer is simple. Here's some more info from u-boot:
# MTK NAND # : Use HW ECC
NAND ID [C2 F1 80 91 03]
Device found in MTK table, ID: c2f1, EXT_ID: 809103
Support this Device in MTK table! c2f1
select_chip
[NAND]select ecc bit:12, sparesize :112 spare_per_sector=28
Signature matched and data read!
load_fact_bbt success 1023
load fact bbt success
[mtk_nand] probe successfully!
mtd->writesize=2048 mtd->oobsize=112, mtd->erasesize=131072 devinfo.iowidth=8
From the vendor mtk_nand2 driver:
nand_chip->ecc.mode = hw->nand_ecc_mode; /* enable ECC */
nand_chip->ecc.strength = 1;
[ 9.398860] [NAND]select ecc bit:12, sparesize :112 spare_per_sector=28
Also note:
mtd->oobsize = devinfo.sparesize;
Which might be the misreporting.
In our driver, it comes out as:
[ 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
I tried adjusting in nand_onfi.c ecc_bits = 12 and spare_bytes_per_page to 112,
to no avail.
I set that back, and then in mt7621_nfc_calc_ecc_strength tried setting the
strength to 1, with no obvious difference.
What to try next, thanks!
_______________________________________________
openwrt-devel mailing list
openwrt-devel@lists.openwrt.org
https://lists.openwrt.org/mailman/listinfo/openwrt-devel
