Hi Team,
I have encountered a problem with my new NAND flash K9F4G08U0E from Samsung. The previous NAND is K9F4G08U0D while works fine on our customized board based on PTI Flashboard2.
The NAND reports ECC error when mounting UBI file system.
[ 53.063079] nand_do_read_ops - ecc error page = 42431
[ 53.068511] UBI error: ubi_io_read: error -74 (ECC error) while reading 70 bytes from PEB 602:129024, read 70 bytes
[ 53.079833] UBIFS error (pid 1424): ubifs_check_node: bad magic 0xffff1831, expected 0x6101831
[ 53.089843] UBIFS error (pid 1424): ubifs_check_node: bad node at LEB 600:124928
[ 53.098693] UBIFS error (pid 1424): ubifs_read_node: expected node type 2
[ 53.106292] UBIFS warning (pid 1424): ubifs_ro_mode: switched to read-only mode, error -117
I did some tests using U-boot and here is what I found.
I used the same test procedure with both K9F4G08U0D and K9F4G08U0E.
OMAP3_EVM # nand erase 40000 2000
OMAP3_EVM # mw.b 84000000 ff 20000
OMAP3_EVM # mw.b 85000000 00 20000
OMAP3_EVM # nand write 84000000 40000 20000
OMAP3_EVM # nand dump 40000
Page 00040000 dump:
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OOB:
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OMAP3_EVM # nand write 85000000 40000 20000
OMAP3_EVM # nand dump 40000
Page 00040000 dump:
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OOB:
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The content of that page on K9F4G08U0E is corrupted whereas the content of that page on K9F4G08U0D is all zeroes.
My questions are:
1. the behavior of K9F4G08U0E is normal or not?
2. If it is normal, how should I fix this problem? In u-boot or in kernel?
Here is how u-boot writes UBI image to flash:
if fatload mmc 0:3 ${loadaddr} ubi.img; then
echo Ubi found on sdcard, flashing to nand, this could take a bit...
nandecc hw 2
nand erase 0x00780000 0x1F880000
nand write ${loadaddr} 0x00780000 0x${filesize_pg}
fi
Any suggestion is appreciated,
Thanks in advance,
James