[syslinux] Conditional kernel selection based on CPUID/DMI info

[Jacob Alifrangis]

I think that the best place for something like this would be in the C32
modules,

I could work up a spec for the language / keywords and place it on the
wiki for comment, might take me a few days.

This is exactly the type of leap that syslinux needs.



-----Original Message-----
From: syslinux-bounces at zytor.com [mailto:syslinux-bounces at zytor.com] On
Behalf Of H. Peter Anvin
Sent: Tuesday, January 29, 2008 12:06 PM
To: For discussion of SYSLINUX and tftp-hpa
Subject: Re: [syslinux] Conditional kernel selection based on CPUID/DMI
info

Craig Johnston wrote:
> 
> What do people think of the following for a string substitution
method?
> 
> DEFAULT linux
> 
> LABEL linux
>     KERNEL cpuselect.c32
>     APPEND ${LM?"x86_64":"i386"}/bzImage-${SMP?"smp":"up"}
> initrd=${LM?"x86_64":"i386"}/initrd-${SMP?"smp":"up"} console=ttyS0
> 
> LABEL linux-single
>     KERNEL cpuselect.c32
>      APPEND ${LM?"x86_64":"i386"}/bzImage-${SMP?"smp":"up"}
> initrd=${LM?"x86_64":"i386"}/initrd-${SMP?"smp":"up"} console=ttyS0
> single
> 
> The parameters "LM" and "SMP" are Boolean values that are set in the
> cpuselect.c32 module, and select the replacement text ala the C-like
> conditional statement.  This is just one of many ways to do something
> like this, and it would seem a lot simpler than a full fledged
> scripting language (it's all kept inside a module).
> 
> Am I reinventing the wheel here, or inventing a square wheel?  :)
> 

I think we can consider a pattern-substitution module to be the 
beginning of a scripting language.  We should probably have it collect 
information from as many sources as possible (CPUID, ...)

On the other hand, a fullblown scripting language probably would be easy

enough -- it's not really any different than what you're doing above. 
It's just a matter of having the time to do it...

	-hpa

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