Hook INT18 for IBM servers?

Jarrod Johnson <[email protected]>
Newsgroups gmane.network.etherboot.user
Message-ID <[email protected]>
I see that back in December Glenn Brown pointed out that for IBM
servers in Etherboot, he changed the hook to INT18 to iret to make it
behave normally under IBM BIOS (which does not support BBS).

I don't see gPXE having any config mechanism to build to hook INT18
instead of INT19.  I changed it to hook INT18, but I couldn't figure
out the right way to iret (all my attempts just hung).  If it calls
INT18 or INT19 to exit, it ends poorly (looping/hanging).  At least
when I hooked INT18, it was able to be moved around by the BIOS setup
menu instead of forcing itself to boot first every time, though
getting to a boot device past that I couldn't figure out due to the
whole iret aspect.

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