In message INPD6P$312004E151C9812F7DD3EEB54320D940@libero.it you wrote:
Now I have u-boot-1.1.3 on AT91RM9200DK, but something is still going wrong :-(
Yes. The problem is: You did not read the manual.
U-Boot> tftp 21000000 uImage
...
U-Boot> tftp 21100000 ramdisk
So it seems you want to boot a Linux kernel with root file system in a ramdisk image, but then...
U-Boot> bootm 21000000
...I did not see where you defined your "bootargs" variable, and the correct boot comand for using a ramdisk has two arguments instead of one.
May be into boot.bin there were some setting necessary for the system ?
Nargh. Please forget boot.bin. You will not need it any more.
AFAIK nobody (either Atmel) uses u-boot stored at the beginning of the flash (as many others ARM board producers do), but AT91 uses a pre-bootloader.
I don't know where you got this "knowledge" from, but it is plain wrong.
Any help will be appreciated
Help yourself. Read the manual.
Best regards,
Wolfgang Denk