Reserved blocks are used for storing bad block tables. With "nand bad" command, these reserved blocks are shown as bad blocks. This is leading to confusion when compared with Linux bad blocks. Hence, display "bbt reserved" when printing reserved blocks with "nand bad" command.
To acheive this, return 2 which represents reserved from nand_isbad_bbt() instead of 1 in case of reserved blocks and catch it in cmd/nand.c.
"nand bad" command display's hexadecimal numbers, so add "0x" prefix.
Example log will show up as below.
ZynqMP> nand bad
Device 0 bad blocks: 0x00400000 0x16800000 0x16c00000 0x17000000 0x3d800000 0x3e400000 0xe8400000 0xff000000 (bbt reserved) 0xff400000 (bbt reserved) 0xff800000 (bbt reserved) 0xffc00000 (bbt reserved) 0x116800000 0x116c00000 0x1ff000000 (bbt reserved) 0x1ff400000 (bbt reserved) 0x1ff800000 (bbt reserved) 0x1ffc00000 (bbt reserved)
Signed-off-by: Ashok Reddy Soma ashok.reddy.soma@amd.com Reviewed-by: Michael Trimarchi michael@amarulasolutions.com ---
Changes in v2: - Changed "Reserved for bbt" to (bbt reserved) - Updated description and the log in the description
cmd/nand.c | 9 ++++++--- drivers/mtd/nand/raw/nand_bbt.c | 3 ++- 2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/cmd/nand.c b/cmd/nand.c index 9a723f5757..b41e54ec42 100644 --- a/cmd/nand.c +++ b/cmd/nand.c @@ -567,9 +567,12 @@ static int do_nand(struct cmd_tbl *cmdtp, int flag, int argc,
if (strcmp(cmd, "bad") == 0) { printf("\nDevice %d bad blocks:\n", dev); - for (off = 0; off < mtd->size; off += mtd->erasesize) - if (nand_block_isbad(mtd, off)) - printf(" %08llx\n", (unsigned long long)off); + for (off = 0; off < mtd->size; off += mtd->erasesize) { + ret = nand_block_isbad(mtd, off); + if (ret) + printf(" 0x%08llx%s\n", (unsigned long long)off, + ret == 2 ? "\t (bbt reserved)" : ""); + } return 0; }
diff --git a/drivers/mtd/nand/raw/nand_bbt.c b/drivers/mtd/nand/raw/nand_bbt.c index 911472e91e..cd451870a6 100644 --- a/drivers/mtd/nand/raw/nand_bbt.c +++ b/drivers/mtd/nand/raw/nand_bbt.c @@ -1330,6 +1330,7 @@ int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs) * @mtd: MTD device structure * @offs: offset in the device * @allowbbt: allow access to bad block table region + * Return: 0 - good block, 1- bad block, 2 - reserved block */ int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) { @@ -1348,7 +1349,7 @@ int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) case BBT_BLOCK_WORN: return 1; case BBT_BLOCK_RESERVED: - return allowbbt ? 0 : 1; + return allowbbt ? 0 : 2; } return 1; }