topic Re: imx6ul NAND flash MXS NAND: BCH read timeout problem in i.MX Processors

imx6ul NAND flash MXS NAND: BCH read timeout problem

kr90911 — Wed, 19 Aug 2020 04:15:37 GMT

Hi all,

I want my imx6ul custom board boot from NAND flash,so I flash NAND with UUU.

The NAND flash on my custom board is IS34ML02G084-BLI_63BGA,and bsp version is sumo L4.14.98-2.3.1

I modified u-boot-imx\2018.03-r0\git\include\linux\mtd\rawnand.h :

#define NAND_MFR_SANDISK 0x45
#define NAND_MFR_INTEL        0x89
#define NAND_MFR_ATO           0x9b
#define NAND_MFR_ISSI           0xc8 //add this line

and u-boot-imx\2018.03-r0\git\drivers\mtd\nand\nand_ids.c:

{"IS34ML02G084 2G 3.3V 8-bit",
{ .id = {0xc8, 0xda, 0x90, 0x95, 0x44, 0x7f, 0x7f, 0x7f} },
SZ_64K, SZ_256, SZ_128K, 0, 8, 64,NAND_ECC_INFO(4, SZ_512),4 },

struct nand_manufacturers nand_manuf_ids[] = {
{NAND_MFR_ISSI, "ISSI"},//add this line

When UUU load u-boot to ram: SDP: boot -f u-boot-nand-2018.03-r0.imx

The log from terminal showed:

U-Boot 2018.03-4.14.98-2.3.1+gb1840a0 (Aug 19 2020 - 03:43:18 +0000)
CPU: Freescale i.MX6UL rev1.2 528 MHz (running at 396 MHz)
CPU: Industrial temperature grade (-40C to 105C) at 38C
Reset cause: POR
Model: Freescale i.MX6 UltraLite 14x14 EVK Board
Board: MX6UL 14x14 EVK
DRAM: 256 MiB
NAND: 256 MiB
MMC: FSL_SDHC: 0
Loading Environment from NAND... MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout

How to fix it and make the flash progress continue?

Re: imx6ul NAND flash MXS NAND: BCH read timeout problem

igorpadykov — Wed, 19 Aug 2020 06:36:16 GMT

Hi west

for "MXS NAND: BCH read timeout" error one can consider below patch

[U-Boot] MTD: mxs_nand: Fix BCH read timeout error on boards requiring ECC - Patchwork

Best regards
igor
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Re: imx6ul NAND flash MXS NAND: BCH read timeout problem

kr90911 — Wed, 19 Aug 2020 06:57:43 GMT

Hi Igor,

Thanks for your quick reply.

I checked the file in patch and add:

diff --git a/drivers/mtd/nand/raw/mxs_nand_spl.c b/drivers/mtd/nand/raw/mxs_nand_spl.cindex c628f3adec..ba85baac60 100644
--- a/drivers/mtd/nand/raw/mxs_nand_spl.c
+++ b/drivers/mtd/nand/raw/mxs_nand_spl.c
@@ -201,6 +201,7 @@  static int mxs_nand_init(void)
  /* setup flash layout (does not scan as we override that) */
   mtd->size = nand_chip.chipsize;
   nand_chip.scan_bbt(mtd);
+ mxs_nand_setup_ecc(mtd);
    return 0;  }

After rebuild u-boot-nand,the BCH read timeout problem still there.

Re: imx6ul NAND flash MXS NAND: BCH read timeout problem

kr90911 — Thu, 20 Aug 2020 06:15:07 GMT

Hi Igor,

Could you give me some more further information to deal with this problem?

Re: imx6ul NAND flash MXS NAND: BCH read timeout problem

igorpadykov — Thu, 20 Aug 2020 07:24:06 GMT

one can try to follow

How-To use NAND boot on i.MX6UL EVK board

Best regards
igor