Difference between revisions of "Mboot.c32"

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(added the forgotten '---')
(better match to the syntax (but still not verified))
Line 38: Line 38:
LABEL freebsd
LABEL freebsd
   KERNEL mboot.c32
   KERNEL mboot.c32
   APPEND  freebsd_kernel --- freebsd_initial_ramdisk kernel_option --- kernel_option
   APPEND  freebsd_kernel kernel_option kernel_option --- freebsd_initial_ramdisk  

Revision as of 20:41, 18 April 2009


mboot.c32 is a comboot module for Syslinux that loads images using the Multiboot protocol. A really good use case for this is booting Xen, or any other hypervisor based virtualization pieces that also require an initrd/initramfs. If your Xen boot doesn't require an initrd then, then it is possible to utilize the existing kernel/append method. Another use case for mboot.c32 is to boot FreeBSD.


  • working Syslinux environment
  • mboot.c32


mboot.c32 stage1 stage1_args --- stage2 stage2_args --- stage3 stage3_args [ --- stageX stageX_args ]

The use of --- is required!


Here is an example pxelinux.cfg file for booting Xen

  KERNEL mboot.c32
  APPEND xen-3.2.gz dom0_mem=262144 --- vmlinuz-2.6.16-2-xen-686 console=tty0 root=/dev/md1 ro --- initrd.img-2.6.16-2-xen-686

Here is an example pxelinux.cfg file for booting Xen over HTTP, when using gpxelinux.0 (needs testing)

  KERNEL http://fs.local/pxe/mboot.c32
  APPEND http://fs.local/pxe/xen-3.2.gz dom0_mem=262144 --- http://fs.local/pxe/vmlinuz-2.6.16-2-xen-686 console=tty0 \
root=/dev/md1 ro --- http://fs.local/pxe/initrd.img-2.6.16-2-xen-686

Booting FreeBSD


LABEL freebsd
  KERNEL mboot.c32
  APPEND  freebsd_kernel kernel_option kernel_option --- freebsd_initial_ramdisk