x86: add grub2 iso support

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33639 3c298f89-4303-0410-b956-a3cf2f4a3e73

Config.in

@@ -81,7 +81,7 @@ menu "Target Images"
 	config TARGET_ROOTFS_ISO
 		bool "iso"
 		default n
-		depends TARGET_ROOTFS_INITRAMFS && TARGET_x86
+		depends on TARGET_x86_generic
 		help
 		  Create some bootable ISO image
 

target/linux/x86/base-files/lib/preinit/20_check_iso

@@ -0,0 +1,5 @@
+check_for_iso() {
+	grep -qE '/dev/root.*iso9660' /proc/mounts && ramoverlay
+}
+
+boot_hook_add preinit_mount_root check_for_iso

target/linux/x86/image/Makefile

@@ -10,6 +10,7 @@ include $(INCLUDE_DIR)/image.mk
 export PATH=$(TARGET_PATH):/sbin
 
 GRUB2_MODULES = at_keyboard biosdisk boot chain configfile ext2 linux ls part_msdos reboot serial vga
+GRUB2_MODULES_ISO = at_keyboard biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial vga
 GRUB_TERMINALS =
 GRUB_SERIAL_CONFIG =
 GRUB_TERMINAL_CONFIG =
@@ -159,7 +160,31 @@ define Image/Build/squashfs
 	$(call prepare_generic_squashfs,$(KDIR)/root.squashfs)
 endef
 
-define Image/Build/iso 
+ifdef CONFIG_X86_USE_GRUB2
+  define Image/Build/iso
+	$(INSTALL_DIR) $(KDIR)/root.grub/boot/grub $(KDIR)/grub2
+	$(CP) $(KDIR)/bzImage $(KDIR)/root.grub/boot/vmlinuz
+	grub-mkimage \
+		-o $(KDIR)/grub2/eltorito.img \
+		-O i386-pc \
+		-c ./grub-early.cfg \
+		$(GRUB2_MODULES_ISO)
+	cat \
+		$(STAGING_DIR_HOST)/lib/grub/i386-pc/cdboot.img \
+		$(KDIR)/grub2/eltorito.img \
+		> $(KDIR)/root.grub/boot/grub/eltorito.img
+	sed \
+		-e 's#@SERIAL_CONFIG@#$(strip $(GRUB_SERIAL_CONFIG))#g' \
+		-e 's#@TERMINAL_CONFIG@#$(strip $(GRUB_TERMINAL_CONFIG))#g' \
+		-e 's#@CMDLINE@#root=/dev/sr0 rootfstype=iso9660 rootwait $(strip $(call Image/cmdline/$(1)) $(BOOTOPTS) $(GRUB_CONSOLE_CMDLINE))#g' \
+		-e 's#@TIMEOUT@#$(GRUB_TIMEOUT)#g' \
+		./grub-iso.cfg > $(KDIR)/root.grub/boot/grub/grub.cfg
+	$(CP) $(KDIR)/bzImage $(KDIR)/root.grub/boot/vmlinuz
+	mkisofs -R -b boot/grub/eltorito.img -no-emul-boot -boot-info-table \
+		-o $(KDIR)/root.iso $(KDIR)/root.grub $(TARGET_DIR)
+  endef
+else
+  define Image/Build/iso
 	$(INSTALL_DIR) $(KDIR)/root.grub/boot/grub
 	$(CP) \
 		$(KDIR)/stage2_eltorito \
@@ -173,7 +198,8 @@ define Image/Build/iso
 	$(CP) $(KDIR)/bzImage $(KDIR)/root.grub/boot/vmlinuz 
 	mkisofs -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4 -boot-info-table \
 		-o $(KDIR)/root.iso $(KDIR)/root.grub 
-endef 
+  endef
+endif
 
 ifneq ($(CONFIG_X86_VDI_IMAGES),)
   define Image/Build/vdi

target/linux/x86/image/grub-iso.cfg

@@ -0,0 +1,10 @@
+@SERIAL_CONFIG@
+@TERMINAL_CONFIG@
+
+set default="0"
+set timeout="@TIMEOUT@"
+set root='(cd)'
+
+menuentry "OpenWrt" {
+	linux /boot/vmlinuz @CMDLINE@ noinitrd reboot=bios
+}