[syslinux] Re: Q: passing DHCP options to the booted linux-kernel?

[H. Peter Anvin]

Ph. Marek wrote:
>>Any results ?
> 
> Yes.
> 
> There's a parameter in the pxelinux-configuration file which gets loaded via 
> tftp named "IPAPPEND". If it is set to a value of 1, pxelinux passes a 
> parameter "ip=..,..,..,..." to the kernel - can't remember just know which 
> value order. 
> 
> The linux kernel has a compile option named "ip autoconfiguration".
> With this compiled in it looks for a "ip"-parameter, and depending on other 
> settings, does DHCP, RARP or even PXE (or something other - there were 3 
> options) on the interfaces.
> 
> What I didn't find was how to specify the interface these settings apply - If 
> a machine has several network cards, the one booted from may not be eth0, and 
> AFAIK the kernel uses the parameter on eth0.
> 
> But maybe there's a trick I've missed up to now. Possibly giving the PCI id 
> (or even better, PCI location) to the kernel to specify the interface?
> 

What I might be able to do is to add an option to pass the hardware 
address to the kernel, which would specify the interface.  The PCI ID 
isn't readily available; heck, it might not *exist*.

	-hpa