[U-Boot] where is the crc stored?
What area of memory is the crc stored for a partition? I would like to find some detailed documentation on the crc (how big is it, where it is stored, how to invalidate to force the booting from a second area).
Dear John Stile,
In message 1356114777.28896.92.camel@genx you wrote:
What area of memory is the crc stored for a partition?
Which sort of partitions are you talking here?
I would like to find some detailed documentation on the crc (how big is it, where it is stored, how to invalidate to force the booting from a second area).
In general, erasing the whole region will usually work ;-)
Best regards,
Wolfgang Denk
On Fri, 2012-12-21 at 20:54 +0100, Wolfgang Denk wrote:
Dear John Stile,
In message 1356114777.28896.92.camel@genx you wrote:
What area of memory is the crc stored for a partition?
Which sort of partitions are you talking here?
Maybe partition is the wrong word for a memory address region.
I am a total new-bee, but I have read there is a crc check in u-boot.
The crc check can result in a: Warning: Bad CRC, using default environment
The crc is considered during the bootcmd.
I would like to find some detailed documentation on the crc (how big is it, where it is stored, how to invalidate to force the booting from a second area).
In general, erasing the whole region will usually work ;-)
Best regards,
Wolfgang Denk
I would like to know where this crc is stored.
I would like to know is it 8-bit, 16-bit, and 32-bit, or other.
Dear John Stile,
In message 1356125251.28896.119.camel@genx you wrote:
I am a total new-bee, but I have read there is a crc check in u-boot.
Actually there are several such checks, for several different purposes.
The crc check can result in a: Warning: Bad CRC, using default environment
THis is when checking if there is a valid environment. So we are talkign about the CRC which protects the persistent environment copy. The structure of this is defined in "include/environment.h", see struct environment_s - as you can see, this is a CRC32.
The crc is considered during the bootcmd.
No, this has absolutely nothing to do with bootcmd.
I would like to know where this crc is stored.
In the first 4 bytes of the external representation of the environment.
I would like to know is it 8-bit, 16-bit, and 32-bit, or other.
32 bit.
Best regards,
Wolfgang Denk
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Wolfgang Denk