Switch to little-endian buildroot
This change switches the default toolchain target to little-endian, so
we're able to build buildroot packages as LE.
Firmware components (skiboot, hostboot, etc) are kept as BE, so we
compile the toolchain as biarch.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/openpower/package/skiboot/skiboot-0002-libflash-Provide-an-internal-parity-implementation-t.patch b/openpower/package/skiboot/skiboot-0002-libflash-Provide-an-internal-parity-implementation-t.patch
new file mode 100644
index 0000000..e377567
--- /dev/null
+++ b/openpower/package/skiboot/skiboot-0002-libflash-Provide-an-internal-parity-implementation-t.patch
@@ -0,0 +1,87 @@
+From de70ad43ccee4dd51e9d38325c7713f590323a47 Mon Sep 17 00:00:00 2001
+From: Jeremy Kerr <jk@ozlabs.org>
+Date: Mon, 23 Feb 2015 16:43:53 +0800
+Subject: [PATCH] libflash: Provide an internal parity implementation, to
+ remove libgcc dependency
+
+In commit 8f5b8616, we introduced a dependency on libgcc, for the
+__builtin_parityl() function in commit 6cfaa3ba.
+
+However, if we're building with a biarch compiler, we may not have a
+libgcc available.
+
+This commit removes the __builtin_parityl() call, and replaces with the
+equivalent instructions, and removes the dependency on libgcc.
+
+Although this is untested, I have confirmed that the __builtin_parityl()
+functions emits the same instructions (on power7 and power8, with
+gcc-4.9) as we're using in the parity() function.
+
+Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
+---
+ Makefile.main | 5 ++---
+ libflash/ecc.c | 14 +++++++++++++-
+ 2 files changed, 15 insertions(+), 4 deletions(-)
+
+diff --git a/Makefile.main b/Makefile.main
+index 665baf4..b5376fc 100644
+--- a/Makefile.main
++++ b/Makefile.main
+@@ -120,7 +120,6 @@ OBJS += $(LIBPORE)
+ endif
+ OBJS += $(LIBC) $(CCAN) $(DEVSRC_OBJ)
+ OBJS_NO_VER = $(OBJS)
+-EXTRA_LIBS = -Wl,-lgcc
+ ALL_OBJS = $(OBJS) version.o
+
+ ALL_OBJS_1 = $(ALL_OBJS) asm/dummy_map.o
+@@ -130,12 +129,12 @@ $(TARGET).lid: $(TARGET).elf
+ $(call Q,OBJCOPY, $(OBJCOPY) -O binary -S $^ $@, $@)
+
+ $(TARGET).tmp.elf: $(ALL_OBJS_1) $(TARGET).lds $(KERNEL)
+- $(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(ALL_OBJS_1) $(EXTRA_LIBS) -o $@, $@)
++ $(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(ALL_OBJS_1) -o $@, $@)
+
+ asm/real_map.o : $(TARGET).tmp.map
+
+ $(TARGET).elf: $(ALL_OBJS_2) $(TARGET).lds $(KERNEL)
+- $(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(ALL_OBJS_2) $(EXTRA_LIBS) -o $@, $@)
++ $(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(ALL_OBJS_2) -o $@, $@)
+
+ $(SUBDIRS):
+ $(call Q,MKDIR,mkdir $@, $@)
+diff --git a/libflash/ecc.c b/libflash/ecc.c
+index 9293743..3d94594 100644
+--- a/libflash/ecc.c
++++ b/libflash/ecc.c
+@@ -88,6 +88,18 @@ static uint8_t syndromematrix[] = {
+ UE, UE, UE, UE, 4, UE, UE, UE, UE, UE, UE, UE, UE, UE, UE, UE,
+ };
+
++static uint8_t parity(uint64_t data)
++{
++ uint8_t p;
++
++ asm volatile(
++ "popcntb %1,%0\n"
++ "prtyd %1,%1\n"
++ : "=r"(p) : "r"(data));
++
++ return p;
++}
++
+ /**
+ * Create the ECC field corresponding to a 8-byte data field
+ *
+@@ -100,7 +112,7 @@ static uint8_t eccgenerate(uint64_t data)
+ uint8_t result = 0;
+
+ for (i = 0; i < 8; i++)
+- result |= __builtin_parityl(eccmatrix[i] & data) << i;
++ result |= parity(eccmatrix[i] & data) << i;
+
+ return result;
+ }
+--
+1.9.1
+