Mike Frysinger wrote:
On Monday 20 April 2009 11:46:22 Gerrit Van Damme wrote:
I've copied a flash image of one board to another one and changed the ethaddr (environment variable) of course when I start Uboot now the system says: CRC bad, using default environment variables. Now what I would like to do is recalculate that CRC, change it in the image and then copy it to the second board. Can anyone tell me how I can calculate the CRC and where it is located. I already understood that it's a CRC32.
"saveenv". the CRC is the first 4 bytes of the environment and is calculated using the environment. -mike
Hey Mike,
Thanks for your answer.
The saveenv command doesn't work for me because then the default env variables are stored and this is what I want to avoid.
It's already a good thing that I can see that the first 4 bytes really look like the CRC of the environment. So this was really helpfull info. Now you tell me it's calculated using the environment. In the source code I found the env variables crc calculated for a size of ENV_SIZE, but I was unable to see how it was defined. Do you have more info on this?
Is the environment data (for crc calculation) terminated by a certain char (or sequence of chars) ?
Thanks and regards,
Gerrit