Re: Hook INT18 for IBM servers?

On Monday 24 August 2009 19:13:43 Jarrod Johnson wrote:
> In short, the GIT change did allow gPXE to detect PnP capability, but
> INT19 is still detected/used, and I'm pretty sure that is an accurate
> assessment of IBM BIOS capabilities (PnP, but not BBS compliant).

Thanks for testing this.  I was waiting for an opportunity to get hold of an 
IBM to test against.

I believe that most IBM BIOSes usually have some form of "recapture INT 19" 
option.  If you use this, you should find that the BIOS overwrites the INT 19 
value written by gPXE, which will prevent gPXE interfering with the boot 
process.  You *should* then be able to select gPXE via whatever 
non-BBS-compliant boot device selection mechanism the BIOS provides.

This is based only partly on memory; I may be wrong on some of the details.

Michael

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