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@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)