John Ashfield wrote:
u-boot setups MMU for maximum of 256M memory using Block Address Translation. Do you have any idea how to setup MMU for more than 256M (for example 1G of memory)?
You did not specify which processor, but in any case, the answer can be found in your processor manaul. For example, for the 603e core, found in many Motorola embedded PowerPC processors, you cannot access more than 256 MB using a single BAT register. I believe this is a PowerPC architectural limitation. However, you might be able to juggle your system resources/configuration to use more than one BAT for mapping in memory. There are four pairs of BAT registers used for translating data accesses, and another four pairs for instruction accesses. See "PowerPC Microprocessor Family: The Programming Environments" (the green book) and your processor manual for details.
Regards,
Chris Hallinan DS4.COM, Inc.