Ifcpu.c32

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Revision as of 19:57, 29 November 2009 by Erwan (talk | contribs) (Updating ifcpu)

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About

ifcpu.c32 is a comboot module for Syslinux that checks some CPU flags and loads the appropriate label in a pxelinux.cfg file.

This is only available in Syslinux 3.84 or later.

Requirements

  • working Syslinux environment
  • two booting entry

Syntax

ifcpu.c32 <options> <cpu_features> -- first_label -- second_label

if the <cpu_features> match the current host, first_label is loaded, else let's boot second_label.

The use of -- is required!

Options

  • debug  : display some debugging messages
  • dry-run  : just do the detection, don't boot

CPU Features

  • 64  : CPU have to be x86_64 compatible
  • hvm  : Processor must have hardware virtualization (hvm or svm)
  • multicore : Processor must be multi-core
  • smp  : System have to be SMP

if you want to match many cpu features, just separate them with a single space

Example

Here is an example pxelinux.cfg file for booting

    label test
        com32 ifcpu.c32
        append 64 hvm multicore -- boot_entry_1 -- boot_entry_2
    label boot_entry_1
        kernel vmlinuz
        append ...
    label boot_entry_2
        kernel vmlinuz_64
        append ...

Further Reading

None