Subject: Re: FDDI: PC/BIOS and MTU
To: Jonathan Stone <jonathan@DSG.Stanford.EDU>
From: Chris G. Demetriou <email@example.com>
Date: 06/01/1999 15:22:02
Jonathan Stone <jonathan@DSG.Stanford.EDU> writes:
> Ah, but if you put a board which (like the PCI tulip and DEFPA FDDI)
> *does* need bus-mastering, into a PCI slot which doesn't support
> bus-mastering, you've already lost. And this mostly (solely?)
> affects early 486 PCI implementations, anyway.
certainly not 'solely'. I saw it in the context of slots behind
PPBs. For whatever reason, the designers thought non-bus-mastering
slots were 'OK.'
> Isnt the tradeoff really: Are we better off to work around buggy
> BIOS/setup which dont enable the busmastering bit, or to leave it bit
> alone, and risk not catching the `board incorrectly inserted in
> non-busmaster slot' case?
Yes, that is the tradeoff. However, that wasn't the original claim,
which was that change couldn't have adverse effects. it certainly
Chris Demetriou - firstname.lastname@example.org - http://www.netbsd.org/People/Pages/cgd.html
Disclaimer: Not speaking for NetBSD, just expressing my own opinion.