[U-Boot] [RFC] ARM: Toolchain configuration for Cortex A8 based OMAP3?

[Dirk Behme <dirk.behme@googlemail.com>]

While preparing U-Boot patches for ARM Cortex A8 based OMAP3 [1], we 
found that we use CodeSourcery ARM toolchain [2], and the way we 
locally modified main Makefile to use this toolchain is most probably 
incompatible with mainline.

Please find below some diffs what we did locally.

We now like to discuss/ask what's the best way to align this with 
mainline to be able to submit OMAP3 patches?

Any hints or proposals?

Many thanks,

Dirk

[1] 
http://www.sakoman.net/cgi-bin/gitweb.cgi?p=u-boot-omap3.git;a=summary 
('common' branch)

[2] http://www.codesourcery.com/gnu_toolchains/arm/portal/release313

Relevant parts of OMAP3 patch we talk about here (most probably 
reformated cause of copy & paste to mailtool, so just for discussion. 
Final patches will be sent by git-send-mail). Note the -lgcc_eh which 
seems to be CodeSourcery specific, and the -march=armv7a in config.mk.

diff -uprN uboot_clean/Makefile uboot_beagle/Makefile
--- uboot_clean/Makefile	2008-08-22 19:57:05.000000000 +0200
+++ uboot_beagle/Makefile	2008-08-22 19:53:52.000000000 +0200
@@ -141,7 +141,7 @@ ifeq ($(ARCH),ppc)
  CROSS_COMPILE = ppc_8xx-
  endif
  ifeq ($(ARCH),arm)
-CROSS_COMPILE = arm-linux-
+CROSS_COMPILE = arm-none-linux-gnueabi-
  endif
  ifeq ($(ARCH),i386)
  CROSS_COMPILE = i386-linux-
@@ -253,7 +253,7 @@ LIBBOARD = board/$(BOARDDIR)/lib$(BOARD)
  LIBBOARD := $(addprefix $(obj),$(LIBBOARD))

  # Add GCC lib
-PLATFORM_LIBS += -L $(shell dirname `$(CC) $(CFLAGS) 
-print-libgcc-file-name`) -lgcc
+PLATFORM_LIBS += -L $(shell dirname `$(CC) $(CFLAGS) 
-print-libgcc-file-name`) -lgcc -lgcc_eh

  # The "tools" are needed early, so put this first
  # Don't include stuff already done in $(LIBS)
@@ -2641,6 +2641,18 @@ SMN42_config	:	unconfig
  	@$(MKCONFIG) $(@:_config=) arm arm720t SMN42 siemens lpc2292

 
#########################################################################
+## ARM CORTEX Systems
+#########################################################################
+omap3_beagle_config :	unconfig
+	@$(MKCONFIG) $(@:_config=) arm omap3 beagle omap3
+
+omap3_overo_config :	unconfig
+	@$(MKCONFIG) $(@:_config=) arm omap3 overo omap3
+
+omap3_evm_config :	unconfig
+	@$(MKCONFIG) $(@:_config=) arm omap3 evm omap3
+
+#########################################################################
  ## XScale Systems
 
#########################################################################

diff -uprN uboot_clean/cpu/omap3/config.mk 
uboot_beagle/cpu/omap3/config.mk
--- uboot_clean/cpu/omap3/config.mk	1970-01-01 01:00:00.000000000 +0100
+++ uboot_beagle/cpu/omap3/config.mk	2008-08-22 19:52:20.000000000 +0200
@@ -0,0 +1,34 @@
+#
+# (C) Copyright 2002
+# Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+#
<cut GPL>
+#
+PLATFORM_RELFLAGS += -fno-strict-aliasing  -fno-common -ffixed-r8 \
+	-msoft-float
+
+PLATFORM_CPPFLAGS += -march=armv7a
+# 
=========================================================================
+#
+# Supply options according to compiler version
+#
+# 
=========================================================================
+#PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
+PLATFORM_CPPFLAGS +=$(call cc-option)
+PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call 
cc-option,-malignment-traps,))