Re: [PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

[Harvey Hunt <harvey.hunt@imgtec.com>]

Hi Boris,

On 26/02/16 00:57, Boris Brezillon wrote:
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
>   drivers/mtd/nand/nand_base.c | 183 +++++++++++++++++++------------------------
>   drivers/mtd/nand/nand_bch.c  |   3 +-
>   2 files changed, 82 insertions(+), 104 deletions(-)
>
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 91672bf..17504f2 100644
[...]

I just pulled your nand/ecclayout branch from github and tested out your 
latest patchset "mtd: rework ECC layout definition" on a Ci20 
(jz4780_{nand,bch}) and noticed that my board was failing to boot.

I bisected to this patch, here is the kernel's output during boot:

479556d ("mtd: nand: core: use mtd_ooblayout_xxx() helpers where 
appropriate"):

[ 0.256349] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[ 0.262860] nand: Micron MT29F64G08CBAAAWP
[ 0.266970] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 8192, 
OOB size: 448
[ 0.274856] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[ 0.288982] Bad block table not found for chip 0
[ 0.297673] Bad block table not found for chip 0
[ 0.302328] Scanning device for bad blocks
[ 0.320135] Bad eraseblock 90 at 0x00000b400000
[ 0.324829] Bad eraseblock 91 at 0x00000b600000
[ 0.931085] Bad eraseblock 4092 at 0x0001ff800000
[ 0.935947] Bad eraseblock 4093 at 0x0001ffa00000
[ 0.944878] nand_bbt: error while writing bad block table -34
[ 0.950666] jz4780-nand: probe of 1b000000.nand-controller failed with 
error -34
[ 0.958302] UBI error: cannot open mtd 3, error -19
[ 0.963002] UBI error: cannot open mtd 4, error -19[ 0.970419] clk: Not 
disabling unused clocks
[ 0.975011] UBIFS error (pid: 1): cannot open "ubi1:root", error -19VFS: 
Cannot open root device "ubi1:root" or unknown-block(0,0): error -19
[ 0.987810] Please append a correct "root=" boot option; here are the 
available partitions:
[ 0.996210] Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
[ 1.004498] Rebooting in 10 seconds..

6625d32 ("mtd: use mtd_ooblayout_xxx() helpers where appropriate"):

[ 0.256232] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[ 0.262745] nand: Micron MT29F64G08CBAAAWP
[ 0.266854] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 8192, 
OOB size: 448
[ 0.274739] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[ 0.285993] Bad block table found at page 1048320, version 0x01
[ 0.294353] Bad block table found at page 1048064, version 0x01
[ 0.301523] nand_read_bbt: bad block at 0x00000b400000
[ 0.306677] nand_read_bbt: bad block at 0x00000b600000
[ 0.312289] 5 ofpart partitions found on MTD device 
1b000000.nand-controller.1
[ 0.319553] Creating 5 MTD partitions on "1b000000.nand-controller.1":
[ 0.326098] 0x000000000000-0x000000800000 : "u-boot-spl"
[ 0.331757] 0x000000800000-0x000000a00000 : "u-boot"
[ 0.337185] 0x000000a00000-0x000000c00000 : "u-boot-env"
[ 0.342903] 0x000000c00000-0x000004c00000 : "boot"
[ 0.348109] 0x000004c00000-0x000200000000 : "system"
[ 0.354284] ubi0 error: ubi_attach_mtd_dev: More than 64 PEBs are needed 
for fastmap, sorry.
[...]

I'll look into this more later today, but wanted to run it by you in 
case you have any thoughts.

Thanks,

Harvey