[U-Boot] powerpc unlock cache difference between e300 and e500

[Scott Wood]

On Thu, 6 Jan 2011 11:11:21 +0800
YiChao Ma <ycma at mail.ustc.edu.cn> wrote:

> hi:
>   My question is why e500 unlock_ram_in_cache in board.c ,and e300 unlock_ram_in_cache in bootm.c?

e500 uses the data cache for normal caching after it's done with
the locked SRAM.  e300 doesn't -- mainly as a matter of history and
needing to fixing any bugs that pop up.  So it only needs to unlock the
cache sometime before transferring control to the OS.

-Scott