Date: Sat, 31 Oct 1998 20:48:46 -0800 From: David Greenman <dg@root.com> To: John Polstra <jdp@polstra.com> Cc: Greg Lehey <grog@lemis.com>, hardware@FreeBSD.ORG Subject: Re: Mixing 8- and 16-bit shared memory ISA cards Message-ID: <199811010448.UAA02906@implode.root.com> In-Reply-To: Your message of "Sat, 31 Oct 1998 20:31:07 PST." <199811010431.UAA24975@austin.polstra.com>
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>> It affects all machines with ISA busses, not just early x86. The ed >> driver goes to great pains, however, to attempt to work around this >> problem by putting 16bit cards into 16bit memory mode only while >> actually accessing them. The rest of the time they are left in 8bit >> mode. So you should be able to mix them in the same 128K region in >> this specific case, but GENERALLY you cannot. > >Thanks for the info! That explains why I didn't see problems when I >"should" have. > >Speaking of such matters ... The manual for my SMC 8013 card says that >the card can be put into either an 8-bit or a 16-bit slot. (It's a >16-bit card.) But when I tried putting it into an 8-bit slot, and set >flags=0x2 to force 8-bit mode, the probe said something like "failed >to clear shared memory." Yeah, don't do that. :-) -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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