In message 200404221231280781.010AF649@smtp.wanadoo.fr you wrote:

I am trying to boot linux with a board based on an atmel at91rm9200.

U-boot is running but the crc show a strange behaviour : when used on a small amount of memory, like 0x2000 or 0x1000, evrything seems fine. However, with bigger amount, the cpu seems to hang.

With a 0x20000 size, it always fails. With 0x10000 it sometimes works.

Check your download address, and your load address; calculate how big the uncompressed size of your image is; check for overlaps.

In short: download to a different (higher) address.

Best regards,

Wolfgang Denk