Date: Wed, 8 Jan 1997 13:27:23 -0500 From: "Steve Sims" <SimsS@IBM.Net> To: "Terry Lambert" <terry@lambert.org> Cc: <Hackers@FreeBSD.ORG> Subject: Re: Bounce Buffers and CCD Message-ID: <199701081828.SAA207537@smtp-gw01.ny.us.ibm.net>
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> From: Terry Lambert <terry@lambert.org> >> (Terry, I hope I haven't quoted you out of context, but I'm here to tell >> ya': BOUNCE-BUFFERS is a MANDATORY option for >16M systems, at least on >> 3.0-CURRENT with my mo-bo having PCI, ISA and VESA!) > > Then it's not required AND it's broken. 8-(. > > Bounce conditions are supposed to be autodetected. Would that it were true.... > What controller are you using? (PCI/VESA/ISA?) Plain-vanilla ISA flavor Adaptec 1542-CF, Firmware 2.02 (IIRC), defaults all around: 0x330, IRQ:11 DRQ:5 > How many address lines are propagated, if PCI/VESA? (24/32?) Beats me. How can I find out? (Not that I'm sure it matters, being an ISA-centric failure. > It may be that your motherboard is broken... literally, the config > BOUNCE_BUFFERS option is defined as turning on bouncing in conditions > where it is not supposed to be required according to the hardware > specifications for the busses involved. It may be the motherboard loses. It's pretty old; no-name P-5/90. I've got a Mach-32 card in a PCI slot, everything else is ISA; ports, SCSI. If we need more granularity to determine why this board fails, I'll pop it out and decipher the silk screening. Say the word. > If you are using an ISA bus mastering DMA controller, it's supposed > to be handled. If you are using nything else, it's supposed to be > unnecessary; if you find it necessary for non-ISA hardware, your > motherboard is not standards compliant and you should contact the > manufacturer (and send mail with make/model/revision to the hardware > list maintainers for a "don't anyone else buy one of these" note). "Supposed" being the operative term here... ;-) ...sjs...
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