nand flash disable ecc

[Ivan Riabtsov]

i turned off checking in dts file but still get the following error message:

[   10.526949] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 64 bytes from PEB 0:0, read only 64 bytes, retry
[   10.540822] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 64 bytes from PEB 0:0, read only 64 bytes, retry
[   10.554798] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 64 bytes from PEB 0:0, read only 64 bytes, retry
[   10.568493] ubi0 error: ubi_io_read: error -74 (ECC error) while
reading 64 bytes from PEB 0:0, read 64 bytes
[   10.578964] CPU: 0 PID: 1 Comm: swapper Not tainted 5.10.50 #1
[   10.585306] Hardware name: Freescale MXS (Device Tree)

at the same time I can boot the system with nfs root, write the ubifs
image to nand and on the next boot it is successfully mounted
automatically, probably the problem is that uboot does not write the
image correctly, tell me what can be done, imx28 system, arm
processor?


вт, 3 авг. 2021 г. в 12:42, Ivan Riabtsov <ivriabtsov at gmail.com>:
>
> Hello. Please tell me how to disable ecc checking in nand memory? I
> only found this:
> https://www.kernel.org/doc/html/v4.14/driver-api/mtdnand.html#ecc-selection-constants
> but didn't figure out how to disable ecc checking.
> What i did:
>
> diff -Naur linux-5.10.50_orig/drivers/mtd/nand/raw/nand_base.c
> linux-5.10.50/drivers/mtd/nand/raw/nand_base.c
> --- linux-5.10.50_orig/drivers/mtd/nand/raw/nand_base.c 2021-07-14
> 17:56:55.000000000 +0300
> +++ linux-5.10.50/drivers/mtd/nand/raw/nand_base.c 2021-08-03
> 11:20:41.566988751 +0300
> @@ -43,6 +43,7 @@
>  #include <linux/mtd/partitions.h>
>  #include <linux/of.h>
>  #include <linux/gpio/consumer.h>
> +#include <linux/printk.h>
>
>  #include "internals.h"
>
> @@ -4902,9 +4903,12 @@
>   int err;
>
>   err = of_property_read_string(np, "nand-ecc-mode", &pm);
> ####### at this point the checkout is turned off, as I assume. Since
> the debug message in the kernel appears exactly in this place
> + pr_emerg("!!!!!!!!!!!!err is %d, prop is: %s\n", err, pm);
>   if (err)
> - return NAND_ECC_ENGINE_TYPE_INVALID;
> + return NAND_ECC_ENGINE_TYPE_NONE;
> + /*return NAND_ECC_ENGINE_TYPE_INVALID;*/
>
> + printk(KERN_EMERG "!!!!!!!!!prop is: %s\n", pm);
>   for (eng_type = NAND_ECC_NONE;
>        eng_type < ARRAY_SIZE(nand_ecc_legacy_modes); eng_type++) {
>   if (!strcasecmp(pm, nand_ecc_legacy_modes[eng_type])) {
>
> but it doesn't work. Please, tell me, how i can disable ecc checking?