In omap nand driver we used to do 32-bit reads (in function omap_read_buf_pref, using 'ioread32_rep' i.e.: __raw_readsl), and it was working fine till some time back. But now, somehow, this has got some problem. Reads are not being done successfully, and driver gives lots for error reprot like below: td->read(0x604 bytes from 0x1fc) returned ECC error uncorrectable error : uncorrectable error : uncorrectable error : uncorrectable error : uncorrectable error : uncorrectable error : mtd->read(0x520 bytes from 0x2e0) returned ECC error While if we change 32-bit reads to 16-bit reads (using 'ioread16_rep' i.e.: __raw_readwl) makes it working fine. (A patch to do this is listed below at the bottom of this mail.) I have not seen any change in routine '__raw_readsl'. So, could someone help me find out the root cause the issue? Thanks for any input. -- Regards, Vimal Singh diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index aaef170..dc493f5 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -288,14 +288,14 @@ static void omap_read_buf_pref(struct mtd_info struct omap_nand_info, mtd); uint32_t pfpw_status = 0, r_count = 0; int ret = 0; - u32 *p = (u32 *)buf; + u16 *p = (u16 *)buf; /* take care of subpage reads */ - for (; len % 4 != 0; ) { + for (; len % 2 != 0; ) { *buf++ = __raw_readb(info->nand.IO_ADDR_R); len--; } - p = (u32 *) buf; + p = (u16 *) buf; /* configure and start prefetch transfer */ ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x0); @@ -308,10 +308,10 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len) } else { do { pfpw_status = gpmc_prefetch_status(); - r_count = ((pfpw_status >> 24) & 0x7F) >> 2; - ioread32_rep(info->nand_pref_fifo_add, p, r_count); + r_count = ((pfpw_status >> 24) & 0x7F) >> 1; + ioread16_rep(info->nand_pref_fifo_add, p, r_count); p += r_count; - len -= r_count << 2; + len -= r_count << 1; } while (len); /* disable and stop the PFPW engine */ -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html