How to access u boot environment from linux?

akomarov80 — Wed, 03 Jul 2013 20:24:12 GMT

Hello

I try to make firmware update tool for imx35. But i have one problem (

How can I access and change the u-Boot env variables in linux. Using the u-boot/tools/env directory in u boot directory:

u-boot$ make env

Which created the executable file fw_printenv. I copied this to /usr/sbin and on target etc/fw_env.config file:

# Configuration file for fw_(printenv/saveenv) utility. # Up to two entries are valid, in this case the redundand # environment sector is assumed present. # MTD device name Device offset Env. size Flash sector size /dev/mtd0 0x00000 0x20000 0x80000

target#./fw_printenv 

What is causing this error?
Warning: Bad CRC, using default environment
bootcmd=bootp; setenv bootargs root=/dev/nfs nfsroot=${serverip}:${rootpath} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; bootm
bootdelay=5
baudrate=115200

target# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00080000 00020000 "Bootloader"
mtd1: 00300000 00020000 "nor.Kernel.1"
mtd2: 00300000 00020000 "nor.Kernel.2"
mtd3: 01c00000 00020000 "nor.rootfs.1"
mtd4: 01c00000 00020000 "nor.rootfs.2"
mtd5: 00003000 00020000 "FIS directory"
mtd6: 02001000 00020000 "Redboot config"
mtd7: 00300000 00080000 "nand.bootloader"
mtd8: 00500000 00080000 "nand.kernel"
mtd9: 10000000 00080000 "nand.rootfs"
mtd10: 00800000 00080000 "nand.configure"
mtd11: 6f000000 00080000 "nand.userfs"

(((

Re: How to access u boot environment from linux?

Yuri — Thu, 12 Sep 2013 08:41:44 GMT

Basically it is possible to build U-boot tools (particularly -

fw_printenw) under LTIB using U-boot package :

$ ./ltib -m prep -p u-boot

$ ./ltib -m scbuild -p u-boot

$ ./ltib -m shell

LTIB> cd rpm/BUILD/u-boot-2009.08

LTIB> make env

After that directory rpm/BUILD/u-boot-2009.08 /tools/env contains the needed files.

To configure correctly fw_env.config, please use section FLASH and environment

organization in board header file (say, mx35_3stack.h or mx35_3stack_mmc.h)
in U-boot directory

include/configs/mx35_<reference board name>.h

There environment parameters are as following :

CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, CONFIG_ENV_SIZE.

Linux fw_env.config may be as following :

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

/dev/mtd0 0xC0000 0x2000 0x2000 1

Device offset = CONFIG_ENV_OFFSET in mx35_3stack.h (768 * 1024)

Env. size = CONFIG_ENV_SIZE in mx35_3stack.h (128 * 1024)

Flash sector size = CONFIG_ENV_SIZE.

topic How to access u boot environment from linux? in i.MX Processors

How to access u boot environment from linux?

Re: How to access u boot environment from linux?