EXTRA_TARGET_ARCH_NAME=i686 under "Toolchain Options" in menuconfig
export ARCH=x86_64 in env for this target
Makefile below, which is not sufficient for an x86_64 system since grub is broken for this. What you also need to do is during image make to swap the x86_64 stage files normally used with stage files from a working x86 (not 64) target. This is not for the fainthearted and, I cannot hold your hand, so, be prepared for a lot of "non-boot" debug. Will not be replying further.
#
# Copyright (C) 2006-2010 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=grub
PKG_VERSION:=0.97
PKG_RELEASE:=3
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=ftp://alpha.gnu.org/gnu/grub
PKG_MD5SUM:=cd3f3eb54446be6003156158d51f4884
PKG_BUILD_DEPENDS:= grub/host
PKG_INSTALL:=1
include $(INCLUDE_DIR)/host-build.mk
include $(INCLUDE_DIR)/package.mk
define Package/grub
SUBMENU:=Boot Loaders
CATEGORY:=Utilities
SECTION:=utils
TITLE:=GRand Unified Bootloader
URL:=http://www.gnu.org/software/grub/
DEPENDS:=@TARGET_x86
endef
MY_CONFIGURE_ARGS += \
--disable-auto-linux-mem-opt \
--disable-hercules \
--without-curses \
MY_CONFIGURE_VARS += \
grub_cv_prog_objcopy_absolute=yes \
CONFIGURE_ARGS += $(MY_CONFIGURE_ARGS)
CONFIGURE_VARS += $(MY_CONFIGURE_VARS)
ifeq ($(HOST_OS),Darwin)
HOST_CFLAGS += $(call host-cc-option,-m32)
HOST_CFLAGS += $(call host-cc-option,-fnested-functions)
endif
ifeq ($(HOST_OS),FreeBSD)
ifeq ($(HOST_ARCH),amd64)
HOST_CFLAGS += $(call host-cc-option,-m32)
HOST_CFLAGS += $(call host-cc-option,-B/usr/lib32)
HOST_CFLAGS += $(call host-cc-option,-L/usr/lib32)
endif
endif
HOST_CFLAGS += $(call host-cc-option,-fno-stack-protector)
HOST_CFLAGS += $(call host-cc-option,-U_FORTIFY_SOURCE)
ifeq ($(ARCH),x86_64)
# Need to compile package as 32 bits
# Assumes EXTRA_TARGET_ARCH_NAME=i686 set in config
# TOOLS_DIR=$(TOPDIR)/staging_dir/toolchain-i386_gcc-$(GCCV)_$(LIBC)-$(LIBCV)
# TOOLS_DIR=/mnt/sda1/OpenWrt_r29322/trunk/staging_dir/toolchain-i386_gcc-$(GCCV)_$(LIBC)-$(LIBCV)
TOOLS_DIR=/home/rossb/OpenWrt/x86/OpenWrt_r29322/staging_dir/toolchain-i386_gcc-$(GCCV)_$(LIBC)-$(LIBCV)
TARGET_CFLAGS = \
-L$(TOOLS_DIR)/lib \
-L$(TOOLS_DIR)/lib/gcc/i486-openwrt-linux-gnu/$(GCCV) \
-B$(TOOLS_DIR)/lib \
-B$(TOOLS_DIR)/lib/gcc/i486-openwrt-linux-gnu/$(GCCV) \
-I$(TOOLS_DIR)/usr/include \
-I$(TOOLS_DIR)/include
LINK_STAGES=ln -sf $(ARCH)-openwrt $(1)/usr/lib/grub/i386-openwrt
HOST_CFLAGS += $(call host-cc-option,-O2)
endif
HOST_CONFIGURE_ARGS += $(MY_CONFIGURE_ARGS) \
--sbindir="$(STAGING_DIR_HOST)/bin" \
--disable-graphics \
HOST_CONFIGURE_VARS += $(MY_CONFIGURE_VARS)
define Host/Configure
(cd $(HOST_BUILD_DIR); aclocal && autoconf && automake)
$(call Host/Configure/Default)
endef
ifeq ($(HOST_OS),Darwin)
define Host/Compile
$(MAKE) -C $(HOST_BUILD_DIR)/lib
$(MAKE) -C $(HOST_BUILD_DIR)/stage2 libgrub.a
$(MAKE) -C $(HOST_BUILD_DIR)/grub
endef
define Host/Install
$(MAKE) -C $(HOST_BUILD_DIR)/grub install
endef
endif
define Build/InstallDev
$(INSTALL_DIR) $(1)/usr/lib
$(CP) $(PKG_INSTALL_DIR)/usr/lib/grub $(1)/usr/lib/
$(LINK_STAGES)
# Temporary non-boot problem: use stage files from -m32 build
# x86_64 Uncomment next 3
cp -f ./files/e2fs_stage1_5 $(STAGING_DIR_HOST)/lib/grub/i386-pc
cp -f ./files/stage1 $(STAGING_DIR_HOST)/lib/grub/i386-pc
cp -f ./files/stage2 $(STAGING_DIR_HOST)/lib/grub/i386-pc
endef
define Package/grub/install
$(INSTALL_DIR) $(1)/usr/bin
$(CP) $(PKG_INSTALL_DIR)/usr/bin/* $(1)/usr/bin/
$(INSTALL_DIR) $(1)/usr/lib
$(CP) $(PKG_INSTALL_DIR)/usr/lib/* $(1)/usr/lib/
$(INSTALL_DIR) $(1)/usr/sbin
$(CP) $(PKG_INSTALL_DIR)/usr/sbin/* $(1)/usr/sbin/
# target/linux/x86/image/Makefile hardcodes i386-openwrt
# link to X86-64 grub stages (x86_64) only
$(LINK_STAGES)
# Temporary non-boot problem: use stage files from -m32 build
# x86_64 Uncomment next 3
cp -f ./files/e2fs_stage1_5 $(1)/usr/lib/grub/i386-openwrt
cp -f ./files/stage1 $(1)/usr/lib/grub/i386-openwrt
cp -f ./files/stage2 $(1)/usr/lib/grub/i386-openwrt
endef
ifeq ($(HOST_ARCH),x86_64)
define Require/working-gcc-m32
echo 'int main(int argc, char **argv) { return 0; }' | \
gcc -x c -o $(TMP_DIR)/a.out - -m32 -lc
endef
endif
$(eval $(call Require,working-gcc-m32, \
Please install 32 bit development files. (gcc-multilib on Debian/Ubuntu, gcc.i686, libgcc.i686, and glibc-devel.i686 on CentOS/Fedora/RHEL) \
))
$(eval $(call HostBuild))
$(eval $(call BuildPackage,grub))
