x86: when building image.iso, use isohybrid if it exists
When building image.iso (make isoimage), use the isohybrid tool if it
exists. isohybrid is a script included with Syslinux 3.72 and higher,
which creates an image that can be booted either as a hard disk
(including removable, e.g. USB disk) or as a CD-ROM.
If isohybrid doesn't exist, then this has no effect.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index 7ee102f..cceba1f 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -181,6 +181,7 @@
mkisofs -J -r -o $(obj)/image.iso -b isolinux.bin -c boot.cat \
-no-emul-boot -boot-load-size 4 -boot-info-table \
$(obj)/isoimage
+ isohybrid $(obj)/image.iso 2>/dev/null || true
rm -rf $(obj)/isoimage
zlilo: $(BOOTIMAGE)