How to modify U-boot configuration in Linux user space

36,562 Views

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

1 Solution

16,056 Views

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

View solution in original post

23 Replies

15,435 Views

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

15,435 Views

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

15,435 Views

Hi Leonardo,

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

15,451 Views

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

15,443 Views

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

15,451 Views

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

15,451 Views

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:

16,057 Views

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

15,451 Views

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.

15,451 Views

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.

15,451 Views

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

15,451 Views

Hi navanisrivastava,

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

Thank you

Ajith P V

15,451 Views

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

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

15,451 Views

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.

15,451 Views

Hi Huazhi,

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

Best regards

Ajith P V

15,451 Views

Hi Huazhi,

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

Ajith P V

15,451 Views

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?

15,451 Views

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.

15,453 Views

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

15,453 Views

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?