From: Ofer Heifetz oferh@marvell.com
The chunk size represents the size of the data chunks, which is used by the controllers that allow to split transferred data.
However, the initial chunk size is used in a non-split way, during device identification. Therefore, it must be large enough for all the NAND commands issued during device identification. This includes NAND_CMD_PARAM which was recently changed to transfer up to 2048 bytes (for the redundant parameter pages).
Thus, the initial chunk size should be 2048 as well.
On Armada 370/XP platforms (NFCv2) booted without the keep-config devicetree property, this commit fixes a timeout on the NAND_CMD_PARAM command:
[..] pxa3xx-nand f10d0000.nand: This platform can't do DMA on this device pxa3xx-nand f10d0000.nand: Wait time out!!! nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x38 nand: Micron MT29F8G08ABABAWP nand: 1024 MiB, SLC, erase size: 512 KiB, page size: 4096, OOB size: 224
This commit is taken from Linux: 'commit c7f00c29aa8' ("mtd: pxa3xx_nand: Increase the initial chunk size")
Signed-off-by: Chris Packham judge.packham@gmail.com Signed-off-by: Ofer Heifetz oferh@marvell.com Reviewed-by: Igal Liberman igall@marvell.com Cc: Stefan Roese sr@denx.de Cc: Simon Glass sjg@chromium.org --- drivers/mtd/nand/pxa3xx_nand.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c index 575fdd2..835b419 100644 --- a/drivers/mtd/nand/pxa3xx_nand.c +++ b/drivers/mtd/nand/pxa3xx_nand.c @@ -1376,7 +1376,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd) goto KEEP_CONFIG;
/* Set a default chunk size */ - info->chunk_size = 512; + info->chunk_size = PAGE_CHUNK_SIZE;
ret = pxa3xx_nand_sensing(host); if (ret) {