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8fb46725cf
Specify 4-bit ECC strength instead of 8-bit, to resolve NAND I/O errors
on ELECOM WRC-X3000GS2.
ELECOM WRC-X3000GS2 has a Macronix MX35UF1G24AD SPI-NAND chip as a flash
storage. That chip is registered as a chip that has 128 bytes OOB and
requires 8-bit ECC, and described as the same in the Macronix's datasheet.
But on WRC-X3000GS2, 8-bit ECC breaks NAND I/O on mtdblock devices with
the following errors and 4-bit ECC needs to be used to resolve this issue.
current (ECC strength=8):
```
[ 1.401566] 0x000000480000-0x000000500000 : "0:appsblenv"
[ 1.407128] 1 fixed-partitions partitions found on MTD device 0:appsblenv
[ 1.410663] Creating 1 MTD partitions on "0:appsblenv":
[ 1.417359] 0x000000000000-0x000000040000 : "env-data"
[ 1.479865] u-boot-env-layout: probe of 79b0000.qpic-nand:flash@0:partitions:partition-0-appsblenv:partition@0:nvmem-layout failed with error -74
root@OpenWrt:~# strings /dev/mtdblock10
[ 55.693754] mtdblock: MTD device '0:appsblenv' is NAND, please consider using UBI block devices instead.
[ 55.694660] I/O error, dev mtdblock10, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2
[ 55.703147] I/O error, dev mtdblock10, sector 8 op 0x0:(READ) flags 0x80700 phys_seg 3 prio class 2
[ 55.711884] I/O error, dev mtdblock10, sector 16 op 0x0:(READ) flags 0x80700 phys_seg 2 prio class 2
[ 55.720778] I/O error, dev mtdblock10, sector 24 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
[ 55.730310] I/O error, dev mtdblock10, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[ 55.738607] Buffer I/O error on dev mtdblock10, logical block 0, async page read
```
after fixing (ECC strength=4):
```
[ 1.402301] 0x000000480000-0x000000500000 : "0:appsblenv"
[ 1.407909] 1 fixed-partitions partitions found on MTD device 0:appsblenv
[ 1.411370] Creating 1 MTD partitions on "0:appsblenv":
[ 1.418075] 0x000000000000-0x000000040000 : "env-data"
(no error)
root@OpenWrt:~# strings /dev/mtdblock10
[ 39.131008] mtdblock: MTD device '0:appsblenv' is NAND, please consider using UBI block devices instead.
bootcmd=bootipq
baudrate=115200
wifi2=7C:F8:54:01:BD:F3
CRASH_COUNT=0
...
```
Fixes:
|
||
|---|---|---|
| .. | ||
| airoha | ||
| apm821xx | ||
| archs38 | ||
| armsr | ||
| at91 | ||
| ath79 | ||
| bcm27xx | ||
| bcm47xx | ||
| bcm53xx | ||
| bcm4908 | ||
| bmips | ||
| d1 | ||
| gemini | ||
| generic | ||
| imx | ||
| ipq40xx | ||
| ipq806x | ||
| ixp4xx | ||
| kirkwood | ||
| lantiq | ||
| layerscape | ||
| loongarch64 | ||
| malta | ||
| mediatek | ||
| mpc85xx | ||
| mvebu | ||
| mxs | ||
| octeon | ||
| omap | ||
| pistachio | ||
| qoriq | ||
| qualcommax | ||
| qualcommbe | ||
| ramips | ||
| realtek | ||
| rockchip | ||
| sifiveu | ||
| siflower | ||
| starfive | ||
| stm32 | ||
| sunxi | ||
| tegra | ||
| uml | ||
| x86 | ||
| zynq | ||
| Makefile | ||