[U-Boot] U-Boot's memory configuration

[Roman Mashak]

Hello

I was reading the U-Boot's README, section "Memory management". I
don't quite understand, so please help me out:
1) does this section embrace various platforms and describe generic
behavior of U-boot or PPC-specific?
2) it presents memory configuration, as I understand, for the case of
booting from flash. How will it look when u-boot is loaded in RAM by
preliminary boot code?

I specifically want to understand how memory is organized by U-Boot on
ARM platform.

Sorry if question sounds silly.

-- 
Roman Mashak