How to modify U-boot configuration in Linux user space

[Huazhi_Hank_Gon]

Hi,

Can I modify the u-boot configuration after booting into the Linux? I don't want to do that by entering into the u-boot setting prompt to do this.

Thanks...

Hank

[vijayk]

Hi Huazhi

While I am building the u-boot with env option i am getting some error. May be some tool chain issue. i am compiling with cross-compiler tools from Android.

ln -s ../../lib_generic/crc32.c crc32.c

crc32.c:14:20: error: stdint.h: No such file or directory

fw_env.c:27:19: error: errno.h: No such file or directory

fw_env.c:28:19: error: fcntl.h: No such file or directory

fw_env.c:29:19: error: stdio.h: No such file or directory

fw_env.c:30:20: error: stdlib.h: No such file or directory

fw_env.c:32:20: error: string.h: No such file or directory

fw_env.c:33:23: error: sys/types.h: No such file or directory

fw_env.c:34:23: error: sys/ioctl.h: No such file or directory

fw_env.c:35:22: error: sys/stat.h: No such file or directory

fw_env.c:36:20: error: unistd.h: No such file or directory

fw_env.c:43:27: error: mtd/mtd-user.h: No such file or directory

fw_env_main.c:42:19: error: stdio.h: No such file or directory

fw_env_main.c:43:20: error: string.h: No such file or directory

fw_env_main.c:44:20: error: stdlib.h: No such file or directory

/home/vijay/build/ch10-2.2/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-gcc -Wall -DUSE_HOSTCC -I/home/vijay/work/allgo/env_uboot/uboot-imx/include crc32.c  fw_env.c  fw_env_main.c -o fw_printenv

crc32.c:14:20: error: stdint.h: No such file or directory

crc32.c:81: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'crc_table'

crc32.c:157: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'crc32'

crc32.c:204: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'crc32_wd'

fw_env.c:27:19: error: errno.h: No such file or directory

fw_env.c:28:19: error: fcntl.h: No such file or directory

fw_env.c:29:19: error: stdio.h: No such file or directory

fw_env.c:30:20: error: stdlib.h: No such file or directory

fw_env.c:32:20: error: string.h: No such file or directory

fw_env.c:33:23: error: sys/types.h: No such file or directory

fw_env.c:34:23: error: sys/ioctl.h: No such file or directory

fw_env.c:35:22: error: sys/stat.h: No such file or directory

fw_env.c:36:20: error: unistd.h: No such file or directory

fw_env.c:43:27: error: mtd/mtd-user.h: No such file or directory

fw_env.c:59: error: expected specifier-qualifier-list before 'ulong'

fw_env.c:69: error: unknown field 'mtd_type' specified in initializer

fw_env.c:69: error: 'MTD_ABSENT' undeclared here (not in a function)

fw_env.c:71: error: unknown field 'mtd_type' specified in initializer

fw_env.c:88: error: expected specifier-qualifier-list before 'uint32_t'

fw_env.c:93: error: expected specifier-qualifier-list before 'uint32_t'

fw_env.c:106: error: expected specifier-qualifier-list before 'uint32_t'

fw_env.c:113: error: unknown field 'flag_scheme' specified in initializer

fw_env.c:219: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'getenvsize'

fw_env.c: In function 'fw_getenv':

fw_env.c:239: error: 'struct environment' has no member named 'data'

fw_env.c:243: error: 'struct environment' has no member named 'data'

Thanks

Vijay

[LeonardoSandova]

Any reason for your native compilation? It seems that the filesystem does not have the necessary headers.

[vijayk]

Hi Leonardo,

Thanks for your response. It was due to compiler issue when i used gcc its working

[ajithpv]

Hi Huazhi,

               Please do the changes which navanisrivastava mentioned in the reply. You have to change the fw_env.config with respect to your system modification rather than simply putting it into /etc. you can easily check this from /proc/mtd.

Once you configure the appropriate values in fw_env.config, then rest of the stuffs are pretty easy and same....

Best regards

Ajith P V

[jiye]

mine is SD card I do not find /proc/mtd exist in my directory do you have any suggestions ?

[Huazhi_Hank_Gon]

Hi Ajith,

Thanks for you reply again. Actually I have done some research about the config file. Here is the link I referred to...

    bootloaders:u-boot:env    [Analog Devices | Mixed-signal and Digital Signal Processing ICs] 

My configuration is

# MTD device name    Device offset    Env.size    Flash sector size    number of sectors

/dev/mtd0                   0xC0000         0x2000      0x2000

And fw_printenv always reported CRC error here.

Here is my console

root@freescale /media$ cat /proc/mtd

dev:    size   erasesize  name

mtd0: 01000000 00080000 "bootloader"

mtd1: 00500000 00080000 "nand.kernel"

mtd2: 10000000 00080000 "nand.rootfs"

mtd3: 10000000 00080000 "nand.userfs1"

mtd4: 1eb00000 00080000 "nand.userfs2"

#define CONFIG_ENV_SECT_SIZE    (8 * 1024)

#define CONFIG_ENV_SIZE         CONFIG_ENV_SECT_SIZE

#if defined(CONFIG_FSL_ENV_IN_NAND)

  #define CONFIG_ENV_IS_IN_NAND 1

  #define CONFIG_ENV_OFFSET 0x200000

#elif defined(CONFIG_FSL_ENV_IN_MMC)

  #define CONFIG_ENV_IS_IN_MMC 1

  #define CONFIG_ENV_OFFSET (768 * 1024)

#elif defined(CONFIG_FSL_ENV_IN_SATA)

  #define CONFIG_ENV_IS_IN_SATA   1

  #define CONFIG_SATA_ENV_DEV     0

  #define CONFIG_ENV_OFFSET       (768 * 1024)

#elif defined(CONFIG_FSL_ENV_IN_SF)

  #define CONFIG_ENV_IS_IN_SPI_FLASH 1

  #define CONFIG_ENV_SPI_CS 1

  #define CONFIG_ENV_OFFSET       (768 * 1024)

#else

  #define CONFIG_ENV_IS_NOWHERE

[navanisrivastav]

Hi Huazhi,

For fw_env.config, your configuration should contain-

MTD device name- /dev/mtdX

     X should be the mtd block number in which your environment address is residing.

Device offset- This would always be 0x0000

Env.size- 0x2000 ( according to CONFIG_ENV_SIZE )

Flash sector size- (CONFIG_ENV_SIZE / Number of sectors)

Number of sectors- (CONFIG_ENV_SIZE  / NAND Block Size(get it from datasheet) )

For your reference this is my configuration

# MTD device name

Device offset        Env. size

Flash sector size

Number of sectors

/dev/mtd1                       0x0000          0x100000                0x20000                 8

when-

#define CONFIG_ENV_SECT_SIZE

(1024 * 1024)

and Block Size for my NAND is 128K

Hope it helps.. All the Best :smileyhappy::smileyhappy:

[ajithpv · Accepted solution]

Hi Huazhi,

               Even I also referred the same link which u provided in above query. For getting the "fw_setenv", do the following steps.

In uboot:

1) give 'env' (optional parameter) in uboot and compile it

2) this will generate the 'fw_printenv' in the U-Boot directory tools/env

3) Copy the fw_env.config file too.

3) follow the next steps from the "U-boot environment variables in linux link"

Please let me know any additional details you want for fw_printenv and fw_setenv.

Best regards

Ajith P V

[Huazhi_Hank_Gon]

Hi. Your are right. It worked. However when I ran it, it shows CRC checksum error.

Do you have any suggestion about this? Thanks again.

[navanisrivastav]

Hi Huazhi,

     Please check fw_env.config file ( u-boot/tools/env/fw_env.config) and make required changes related to env size, Flash sector size and Number of sectors according to flash which you are using. I got similar error but on changing mentioned parameters i got desired output.

[jiye]

Hi,

How can I get the env size, Flash sector size and Number of sectors according to flash which I am using. I have a ls1021a-twr eva board and it's boot from SD card. I do not know how to set the right value in the fw_env.config

Please refer to my post here 

https://community.nxp.com/message/1211889 

[ajithpv]

Hi navanisrivastava,

                            Yes, this is what exactly has to be done. Appreciate for your sincere effort.

Thank you

Ajith P V

[jiangshao]

Hi, I have the same question , someone here can help me?

How to get u-boot environment variables info of sabresd-mx6dq?

[gonfer]

I think you can instruct U-Boot to load arguments from a file. Then, you can modify this file from Linux user space. Please, check U-Boot documentation.

[ajithpv]

Hi Huazhi,

               I used the same uboot utility in i.MX257 board. its working for me..!

Best regards

Ajith P V

[ajithpv]

Hi Huazhi,

               May I know which BSP you are using and how you configured the "fw_setenv"?

Ajith P V

[Huazhi_Hank_Gon]

Hi, Thank you for your replay. I'm using imx53 BSP 11.09 and the package I choose is u-boot tools. What did you choose?

[RobinGong]

I think you can create one file which contain the new boot param. Then use "dd" command in kernel to write the file to the u-boot param area.  

[Huazhi_Hank_Gon]

I have tried to dump the "Uboot area" on the sd card. But the address of the uboot parameter turns to be different for different configurations.

I saw that there is a uboot utils which can do this easily and I enabled this option in my BSP build. But it just doesn't have that tool. Here is the link of the tool I'm talking about.

U-boot environment variables in linux - eLinux.org

[daiane_angolini]

I believe there is no "easy" way to do that from linux prompt. You would need to copy a file to a memory region, raw way

What´s the use case?