[U-Boot] [PATCH] ppc: Unlock cache-as-ram in a consistent manner

[Liu Dave-R63238]

> Previously, non-e500 architectures only unlocked their data 
> cache which
> was used as early RAM when booting to Linux using the "bootm" command.
> This change causes all PPC boards with 
> CONFIG_SYS_INIT_RAM_LOCK defined
> to unlock their data cache during U-Boot's initialization.  This
> improves U-Boot performance and provides a common cache state when
> booting to different OSes.
> 
> Signed-off-by: Peter Tyser <ptyser at xes-inc.com>
> ---
> I've tested this on 86xx boards, it'd be great if someone 
> could test on
> 83xx and 74xx/7xx.  85xx boards should not be affected by this change.
> 
> This change assumes 
> http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/63423
> has already been applied, or the lib/ppc patches in the diffs 
> below can
> be changed to lib_ppc.

I'm afraid some 83xx boards will not work after the patch is applied.
It is some was assuming the data cache locked. (that is cache-inhibited)