conf/machine/include: Cleanup PowerPC tunings to match README

Cleanup the PowerPC tunings to match the new tuning README file.

Default PowerPC to using TUNE_PKGARCH = ${TUNE_PKGARCH_tune-<tune>}

Fix AVAILTUNE settings in ppc603e, and ppce500mc to be addative.

Correct potentially overlapping "spe" definitions in ppce500 and ppce500v2.

(From OE-Core rev: f81f71bcff4bb1032b034b068efe6065113ca9e7)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/meta/conf/machine/include/powerpc/README b/meta/conf/machine/include/powerpc/README
new file mode 100644
index 0000000000..e87fb5082c
--- /dev/null
+++ b/meta/conf/machine/include/powerpc/README
@@ -0,0 +1,17 @@
+2012/03/30 - Mark Hatle <mark.hatle@windriver.com>
+  - Initial revision
+
+There are 4 primary PowerPC ABIs.
+# *) Hard/Soft Floating Point
+# *) 32-bit/64-bit
+
+TUNE_ARCH is defined as either "powerpc" or "powerpc64" based on the m32 
+or m64 feature.
+
+May of the PowerPC package archictures are based on legacy Linux names.
+However, a general naming scheme should be similar to: ppc[64][<family>][-nf].
+(Note: the default package architectures are "powerpc" and "powerpc64".)
+
+TUNE_PKGARCH is defined as TUNE_PKGARCH_tune-${DEFAULTTUNE}.  All 
+PowerPC tunings are required to define TUNE_PKGARCH_tune-<tune>.
+