Date: Sat, 27 Sep 1997 05:55:43 -0500 From: Tony Overfield <tony@dell.com> To: Terry Lambert <tlambert@primenet.com> Cc: hackers@FreeBSD.ORG Subject: Re: INB question Message-ID: <3.0.2.32.19970927055543.006bd29c@bugs.us.dell.com> In-Reply-To: <199709191444.HAA06050@usr07.primenet.com> References: <199709190659.QAA01136@word.smith.net.au>
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At 02:44 PM 9/19/97 +0000, Terry Lambert wrote: >> > Yeah; that's why I picked the extended MCA DMA ports for the detect; >> > that, and I can do the probe non-destructively, with the expectation of >> > a 0 bit in my data and no hardware configuratio changes resulting. >> >> Where is the port exactly? ie. is it likely to be sat on or masked >> over by an ISA device? > >Port 0x18 is the control, and port 0x1A is the data. Port 0x18, on many systems, is an alias of port 0x08, which is the read-only DMA status register and the write-only DMA command register. Likewise, port 0x1A is often an alias of the write-only port 0x0A DMA mask register.
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