[U-Boot-Users] NAND driver question
I have been experiencing a few problems when using a NAND flash for storage in u-boot.
When I'm reading large files (7MB) from the NAND, periodically there will be a NAND ECC read error when using the following command:
=> nand read 400000 0 154000 NAND read: device 0 offset 0x0, size 0x154000 1392640 bytes read: ERROR.
After turning on debug, the problem is occurring in the nand_read_ecc function whereby the ecc check fails. After running it numerous times, there seems to be no correlation between pages that fail and appears to be completely random. Has anyone else had these problems?
Furthermore, the "nand write" command doesn't skip bad blocks. Are you supposed to use a different command to write files to the NAND that skips the bad blocks?
Thanks Craig
"nand write.jffs2" skips bad blocks. I always thought that was a bad name as it has nothing to do with jffs2 other than skipping is how jffs2 handles bad blocks...
Zach
Craig Millen wrote:
I have been experiencing a few problems when using a NAND flash for storage in u-boot.
When I'm reading large files (7MB) from the NAND, periodically there will be a NAND ECC read error when using the following command:
=> nand read 400000 0 154000 NAND read: device 0 offset 0x0, size 0x154000 1392640 bytes read: ERROR.
After turning on debug, the problem is occurring in the nand_read_ecc function whereby the ecc check fails. After running it numerous times, there seems to be no correlation between pages that fail and appears to be completely random. Has anyone else had these problems?
Furthermore, the "nand write" command doesn't skip bad blocks. Are you supposed to use a different command to write files to the NAND that skips the bad blocks?
Thanks Craig
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On Tuesday 29 January 2008, Craig Millen wrote:
I have been experiencing a few problems when using a NAND flash for storage in u-boot.
When I'm reading large files (7MB) from the NAND, periodically there will be a NAND ECC read error when using the following command:
=> nand read 400000 0 154000 NAND read: device 0 offset 0x0, size 0x154000 1392640 bytes read: ERROR.
After turning on debug, the problem is occurring in the nand_read_ecc function whereby the ecc check fails. After running it numerous times, there seems to be no correlation between pages that fail and appears to be completely random. Has anyone else had these problems?
No. NAND blocks can fail and generate ECC errors. But your description doesn't really sound like this is a NAND chips related problem. Does this happen on multiple boards or just s single one? This looks more like a timing problem or something like this to me.
IIRC, then you had to change the 4xx NDFC driver to access the NAND via 8bit access, correct? I have used this driver on multiple 4xx boards and on all boards this driver can be used as is, meaning with 32bit access enabled. Perhaps you still have a problem with the interface to the NAND chips.
Furthermore, the "nand write" command doesn't skip bad blocks. Are you supposed to use a different command to write files to the NAND that skips the bad blocks?
As already mentioned the .jffs2" extension is what you want. ".i" for "image" should do too.
Best regards, Stefan
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participants (3)
-
Craig Millen -
Stefan Roese -
Zach Sadecki