nand flash disable ecc

nand flash disable ecc

[Ivan Riabtsov]

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?

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Re: 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@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?

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Re: 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@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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