In message DC6F86A94046A64094043D44A3A708F7A14AFA@sestoex02.enea.se you wrote:
Thanks for you answer! I have found that one, but I need to be able to specify exactly what memory range that shall be protected. I did find
The pRAM area is always at the very upper end of the RAM. If you want to pass it unchanged between U-Boot and an OS and back there are not many options.
the CONFIG_PRAM-parameter but I did not figure out how to tell u-boot exactly what range not to whipe-out. Such as do not destroy 0x1000-0x2000. Also the solution that I would like to find/create is to have the possibility to set a protect area using a system parameter in order to be able to change the protection zone without recompilation. Would that be a good feature?
I have never seen a need for this, and, given the things you have to keep in mind (memory resizing coee after reset, eventually ECC initialization, making sure that both U-Boot and the OS agree on exactly the same memory area, etc., I don;t see an easy way to do what you want, either.
Why do you have to use a specific memory range? It sounds as if this was a restriction that comes from the OS - how about fixing the problem there?
Best regards,
Wolfgang Denk