update CFLAGS for armv7

This updates $CFLAGS used for armv7. Most of them were just added
to be consistent with what u-boot does. The important ones here
are -march=armv7-a and -mthumb (to allow 16-bit Thumb instructions).

I removed the hard float support because it got errors and
coreboot should never use floats anyway. We're still having trouble
with enums but I want to see how far it gets with this patch.

Also, put the flags in a form that makes diffs easier to read. It's
almost impossible otherwise.

Finally, move some flags to the architecture Makefile, and
rely on the fact that some are set for all architectures.

Depends-On: I6f730d017391f9ec4401cdfd34931c869df10a9e
Change-Id: Ia8a1ae22959933e06f7b996d1832cea40819f1ff
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/2075
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/armv7/Makefile.inc

@@ -138,6 +138,16 @@ endif
 ################################################################################
 # done
 
+CFLAGS += \
+	-fno-common\
+	-ffixed-r8\
+	-mabi=aapcs-linux\
+	-march=armv7-a\
+	-marm\
+	-mno-unaligned-access\
+	-mthumb\
+	-mthumb-interwork
+
 # For various headers imported from Linux
 CFLAGS += -D__KERNEL__
 CFLAGS += -D__LINUX_ARM_ARCH__=7

util/xcompile/xcompile

@@ -106,14 +106,9 @@ detect_special_flags() {
 		CFLAGS="$CFLAGS -Wl,--build-id=none"
 
 	case "$architecture" in
-		arm )
+	armv7 )
-			# testcc "$CC" "$CFLAGS -mcpu=cortex-a9" &&
+		ARMFLAGS=""
-			#	CFLAGS="$CFLAGS -mcpu=cortex-a9"
+		testcc "$CC" "$CFLAGS $ARMFLAGS"&&CFLAGS="$CFLAGS $ARMFLAGS"
-			testcc "$CC" "\
-$CFLAGS -ffixed-r8 -msoft-float -marm -mabi=aapcs-linux \
--mno-thumb-interwork -march=armv7 -mno-thumb-interwork" && CFLAGS="\
-$CFLAGS -ffixed-r8 -msoft-float -marm -mabi=aapcs-linux \
--mno-thumb-interwork -march=armv7 -mno-thumb-interwork"
 			;;
 	esac
 }