Hi again:
This more of a note than a question. I have this issue that I also had with the kernel: Yet for me to find out, reading (particularly out of band data) doesn't work properly unless an empty MTD_NAND_READ0 command is sent after the intial one:
this->cmdfunc (mtd, MTD_NAND_READX, column, page); ==> this->cmdfunc (mtd, MTD_NAND_READ0, -1, -1); <==
I've inserted this second line after all the MTD_NAND_READX commands except for MTD_NAND_READID
Without it, what would happen is that it would start reading the ecccode a few bytes before, hence it won't match with the calculated ecccode. Also the blocks, where I wrote to the first page, would be listed as bad when they're not; understandable since again it is reading the wrong bytes. ------------------------------------------------------------------------------- INCA-IP-ROM # nand write 80400000 0 1000
NAND write: device 0 offset 0, size 4096 ... nand_write_ecc: to = 0x00000000, len = 4096 4096 bytes written: OK INCA-IP-ROM # nand read 80800000 0 1000
NAND read: device 0 offset 0, size 4096 ... nand_read_ecc: from = 0x00000000, len = 4096 ECC bytes are: 96 9a 6b 9a 9a 97 66 a6 9b aa 96 97 3c f0 3f f3 3f cf a9 a6 9b 59 59 57 ECC bytes are: ff ff ff ff ff ff ff ff ff ff 33 30 33 f0 cc f3 03 ff ff 03 cf 33 55 65 nand_read_ecc: Failed ECC read, page 0x00000001 nand_read_ecc: Failed ECC read, page 0x00000001 nand_read_ecc: Failed ECC read, page 0x00000001 4096 bytes read: ERROR -------------------------------------------------------------------------------- When I do a nand dump, the oob data looks like this:
OOB: 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 ff ff ff ff 33 30 33 f0 cc f3 03 ff ff 03 cf 33 55 65 5b 59 5a a7 69 aa 5b 5a aa 6b
I am testing Large page NAND ST 01GW3B on the INCA-IP board.
This extra READ cmd was there in the old cmd_nand.c file in the NanD_ReadBuf function.