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mxs_nand: Fix ECC strength for NAND flash with OOB size of 224

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On a board with an i.mx28 and a Micron MT29F4G08ABAEAH4, Linux says:

NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron MT29F4G08ABAEAH4),
512MiB, page size: 4096, OOB size: 224) the ECC strength is 16.

root@(none):/sys/devices/virtual/mtd/mtd0# for i in ecc_strength oobsize subpagesize; do echo $i = `cat $i`; done
ecc_strength = 16
oobsize = 224
subpagesize = 4096

The ECC strength was not properly discovered by U-Boot causing the data
written by Linux to return an -74 (EBADMSG) when read from U-Boot. This
patch fixes mxs_nand_get_ecc_strength() to function in case of a NAND
flash with page_data_size = 4096 and page_oob_size= 224.

Signed-off-by: Elie De Brauwer <eliedebrauwer@gmail.com>
Acked-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Elie De Brauwer 2013-08-24 16:51:24 +02:00 • committed by Stefano Babic
parent 47ac53d7ae
commit a8f2d0e675
1 changed files with 3 additions and 0 deletions
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3
drivers/mtd/nand/mxs_nand.c
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@ -155,6 +155,9 @@ static inline uint32_t mxs_nand_get_ecc_strength(uint32_t page_data_size,
if (page_oob_size == 218)
return 16;
if (page_oob_size == 224)
return 16;
}
return 0;