nand flash disable ecc

[Ayan Halder]

On 03/08/2021 11:33, Ivan Riabtsov wrote:
> 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?

Please check the kernel config options. You may need to check the 
CONFIG_MTD_<>_ECC options and disable them via menuconfig.

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