[PATCH v5 00/14] Armada 370/XP NAND support
Arnaud Ebalard
arno at natisbad.org
Wed Nov 27 15:52:52 EST 2013
Hi,
arno at natisbad.org (Arnaud Ebalard) writes:
> Well, I guess the bad block the driver put in the bbt are not that bad
> in practice, i.e. they were mistakenly marked that way. I also
> guess^Whope there is a some low level command I could use to simply
> clear the bbt (the NAND had no bad block prior to the test). Any help
> would be appreciated on that point.
Replying to myself w/ the solution: just in case it happens to someone
else, it's as simple as using flash_erase w/ -N option on a kernel
modified (in drivers/mtd/nand/nand_base.c) to allow write to a bad
block w/ the following patch:
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index bd39f7b..e70ef60 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2591,6 +2591,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
instr->state = MTD_ERASING;
while (len) {
+#if 0
/* Check if we have a bad block, we do not erase bad blocks! */
if (nand_block_checkbad(mtd, ((loff_t) page) <<
chip->page_shift, 0, allowbbt)) {
@@ -2599,6 +2600,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
instr->state = MTD_ERASE_FAILED;
goto erase_exit;
}
+#endif
/*
* Invalidate the page cache, if we erase the block which
After a reboot on that modified kernel, a simple call to flash_erase
using -N option will erase the badblocks:
# flash_erase -N /dev/mtd4 0 0
Then, at next reboot an empty bad block table is recreated.
NAND: (ID 0xf1ad) 128 MiB
Bad block table not found for chip 0
Bad block table not found for chip 0
Bad block table written to 0x000007fe0000, version 0x01
Bad block table written to 0x000007fc0000, version 0x01
FPU not initialized
USB 0: Host Mode
USB 1: Host Mode
Ezequiel, I am back in business to test a v2 ;-)
Cheers,
a+
ps: primary source: http://lists.infradead.org/pipermail/linux-mtd/2012-June/041969.html
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