From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Sat, 25 Aug 2012 10:22:58 +0200 Subject: [Buildroot] [PATCH] grub: add host support In-Reply-To: <1345042674-28463-1-git-send-email-rbraun@sceen.net> References: <1345042674-28463-1-git-send-email-rbraun@sceen.net> Message-ID: <20120825102258.3ba3a0dd@skate> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello Arnout, Since you had a look some time ago at Grub (and the problem of building it on x86-64), could you have a look at the below proposal from Richard? Richard proposes to add a host variant of Grub. At some point, I think we discussed changing the target variant so that it gets built with the host compiler (since Grub is always built for x86/x86-64 systems). With Richard's proposal below, I'm a bit worried about the fact that the user needs to do "make host-grub" manually. Of course, we can add the host-grub package for the "Host utilities" menu. But anyway, I want your opinion on this. Thanks! Thomas Le Wed, 15 Aug 2012 16:57:54 +0200, Richard Braun a ?crit : > This change makes it possible to use a grub executable built for the > host to install the boot loader inside an image. It's also a hack to > make it possible to work around x86_64 issues, as long as the user has > 32-bits libraries available to his native toolchain. > > -- Informative part -- > > This change alone doesn't mean you'll have grub magically installed in > your rootfs. First, legacy grub apparently requires a partition table to > mount file systems. You must work around this limitation yourself. Then, > it requires crafting the file system so that grub stuff is provided at > the proper location (e.g. in boot/grub inside your rootfs). On x86_64 > systems, the target grub simply doesn't build, so you'll need to build > host-grub manually and, for example, make your post-build script do > anything necessary so that the host grub is able to setup the boot > loader on your disk image. > > This part is intended as a hint to people trying to use buildroot for > embedded x86 targets in the hope it helps. Included here is a reference > shell script that doesn't require root privileges, which you can use as > a template for your own projects : > > set -e > > CF_SIZE=1024966656 # 1024 MB > CF_BOOT_SIZE=8388608 # 8 MiB > CF_HPC=16 # Heads per cylinder > CF_SPT=63 # Sectors per track > > IMAGES_DIR="output/images" > KERNEL_IMG="$IMAGES_DIR/bzImage" > CF_IMG="$IMAGES_DIR/cf.img" > BOOT_DIR="output/target_boot" > BOOT_IMG="$IMAGES_DIR/bootfs.ext2" > ROOTFS_IMG="$IMAGES_DIR/rootfs.squashfs" > > HOST_DIR="output/host" > SFDISK="$HOST_DIR/usr/sbin/sfdisk" > GENEXT2FS="$HOST_DIR/usr/bin/genext2fs" > E2FSCK="$HOST_DIR/usr/sbin/e2fsck" > GRUB="$HOST_DIR/usr/sbin/grub" > > rm -f $CF_IMG $BOOT_IMG > > make host-util-linux host-genext2fs host-e2fsprogs host-grub > > echo > > cf_boot_start=64 > cf_boot_size=$(($CF_BOOT_SIZE / 512)) > cf_rootfs_start=$(($cf_boot_start + $cf_boot_size)) > cf_sectors=$(($CF_SIZE / 512)) > cf_rootfs_size=$(($cf_sectors - $cf_rootfs_start)) > > cat << EOF > CF layout : > boot: $cf_boot_start ($cf_boot_size) > rootfs: $cf_rootfs_start ($cf_rootfs_size) > > EOF > > cf_cylinders=$(($cf_sectors / ($CF_SPT * $CF_HPC))) > cf_heads=$((($cf_sectors / $CF_SPT) % $CF_HPC)) > cf_sectors=$((($cf_sectors % $CF_SPT) + 1)) > > cat << EOF > CHS emulation: > cylinders: $cf_cylinders > heads: $cf_heads > sectors: $cf_sectors > > EOF > > dd if=/dev/zero of=$CF_IMG bs=1 count=0 seek=$CF_SIZE > $SFDISK -q -L -uS -C $cf_cylinders -H $cf_heads -S $cf_sectors --no-reread $CF_IMG << EOF > $cf_boot_start $cf_boot_size L * > $cf_rootfs_start $cf_rootfs_size > EOF > > $GENEXT2FS -m 0 -b $(($cf_boot_size / 2)) -d $BOOT_DIR -N 64 -U $BOOT_IMG > $E2FSCK -fyDC0 $BOOT_IMG || true > dd if=$BOOT_IMG of=$CF_IMG conv=notrunc seek=$cf_boot_start bs=512 > > dd if=$ROOTFS_IMG of=$CF_IMG conv=notrunc seek=$cf_rootfs_start bs=512 > > $GRUB --device-map=/dev/null --batch << EOF > device (hd0) $CF_IMG > root (hd0,0) > setup (hd0) > EOF > > echo > > Signed-off-by: Richard Braun > --- > boot/grub/grub.mk | 19 +++++++++++++++++++ > 1 files changed, 19 insertions(+), 0 deletions(-) > > diff --git a/boot/grub/grub.mk b/boot/grub/grub.mk > index e8d66f1..c4f52cc 100644 > --- a/boot/grub/grub.mk > +++ b/boot/grub/grub.mk > @@ -82,4 +82,23 @@ define GRUB_UNINSTALL_TARGET_CMDS > rm -rf $(TARGET_DIR)/boot/grub > endef > > +HOST_GRUB_POST_PATCH_HOOKS += GRUB_DEBIAN_PATCHES > + > +HOST_GRUB_CONF_ENV = \ > + CFLAGS="$(GRUB_CFLAGS) -fno-stack-protector" \ > + grub_cv_prog_objcopy_absolute=yes > + > +HOST_GRUB_CONF_OPT = \ > + --disable-auto-linux-mem-opt \ > + --disable-graphics > + > +define HOST_GRUB_INSTALL_CMDS > + install -m 0755 -D $(@D)/grub/grub $(HOST_DIR)/usr/sbin/grub > + mkdir -p $(HOST_DIR)/boot/grub > + cp $(@D)/stage1/stage1 $(HOST_DIR)/boot/grub > + cp $(@D)/stage2/*1_5 $(HOST_DIR)/boot/grub > + cp $(@D)/stage2/stage2 $(HOST_DIR)/boot/grub > +endef > + > $(eval $(autotools-package)) > +$(eval $(host-autotools-package)) -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com