[U-Boot-Users] problems with CRC in fw_printenv and fw_setenv utility and use

[techie_vasu <deepavas@gmail.com>]

Hello,

  Can you please tell me how to build the fw_setenv and fw_printenv using
the mtd-user.h file? I am new to Linux. Please help. I don't see mtd/ in
proc/ directory.

Thanks


u-boot user wrote:
> 
> Hello all,
> 
> I have built the binary fw_printenv by using mtd-user.h from mtd-utils on
> the internet as it fw_printenv won't compile it without using that file.
> So I have used mtd-user.h and mtd-abi.h. The contents of my configuration
> file are 
> # MTD device name       Device offset   Env. size       Flash sector size
> /dev/mtd1               0x0000          0x4000          0x4000 
> 
> When I run fw_printenv  it complained with error Warning : Bad CRC using
> default environment in env_init function in fw_env.c source code. To gain
> a better understanding I print the value crc1 calculated using
> crc32(0,environment.data,ENV_SIZE).  The value it prints is CRC
> computed:FE641197
> If I print the environment.crc value it is D0CA8A0E. As the checksum
> values are different crc1_ok is not set and I get the error. Any clue as
> to why these values would be different? 
> 
> When I use the fw_setenv utility to set an environment variable it gives
> the following errors 
> Writing CRC value to flash: D0C78567
> Unlocking flash...
> Other dev values are: 0
> Current dev value: 0
> Done
> Erasing old environment...
> MTD erase error on /dev/mtd1: Invalid argument
> Error: can't write fw_env to flash
> 
> I want to be able to set bootvars and print bootvars from user space Linux
> code. Linux has support for mtd-utils we tested the mtd-utils interface.
> 
> I look forward to your replies. I appreciate your help.
> 
> Thanks and Regards
> 

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