eglibc and PowerPC SPE documentaion, courtesy Nate CASE.

 /trunk/config/libc.in         |    7     7     0     0 +++++++
 /trunk/arch/powerpc/config.in |   11    10     1     0 ++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

2 files changed, 17 insertions, 1 deletions

diff --git a/arch/powerpc/config.in b/arch/powerpc/config.in
index dc871a0d..6a0b9104 100644
--- a/arch/powerpc/config.in
+++ b/arch/powerpc/config.in
@@ -14,4 +14,13 @@ config ARCH_POWERPC_SPE
     depends on EXPERIMENTAL
     default n
     help
-      Add support for the Signal Processing Engine.
+      Add support for the Signal Processing Engine.  This will set up
+      the toolchain so that it supports the SPE ABI extensions. This
+      mainly targets Freescale e500 processors.
+
+      Setting this option will append "spe" to the end of your target
+      tuple name (e.g., powerpc-e500v2-linux-gnuspe) so that the gcc
+      configure/build system will know to include SPE ABI support.
+      It will also automatically add "-mabi=spe -mspe" to your
+      TARGET_CFLAGS, and "--enable-e500_double" to your CC_EXTRA_CONFIG,
+      so you do not need to explicitly add them.
diff --git a/config/libc.in b/config/libc.in
index e9a6ad93..a8cf28ce 100644
--- a/config/libc.in
+++ b/config/libc.in
@@ -23,6 +23,13 @@ config LIBC_EGLIBC
     select LIBC_SUPPORT_NPTL
     select LIBC_SUPPORT_LINUXTHREADS
     depends on EXPERIMENTAL
+    help
+      EGLIBC (Embedded GLIBC) is a variant of the standard GNU GLIBC
+      that is designed to work well on embedded systems.  EGLIBC strives
+      to be source and binary compatible with GLIBC.  Its goals include
+      a reduced footprint, configurable components, and improved
+      cross-compilation support.  EGLIBC also includes some embedded ports
+      (such as e500/spe) that are normally separate add-ons of GLIBC.
 
 if LIBC_EGLIBC
 source config/libc/eglibc.in