[syslinux] Recoginizng which boot agent was used

[H. Peter Anvin]

George Vicherek wrote:
> Hi,
> 
> Is there a way for init=/linuxrc to know which package (syslinux, 
> pxelinux, ...) was used for booting? What would be a reliable way to 
> detect if we booted via net or from a hdd/cdrom? Is there a variable 
> which gets initialized with the boot device?
> 

The boot loader tells the kernel, but I don't think the kernel currently 
makes this information available to the userspace.  You can of course 
pass in something on the command line to tell you.

	-hpa