Date: Mon, 8 Mar 1999 18:34:38 +0000 (GMT) From: Andy Doran <ad@psn.ie> To: Mike Smith <mike@smith.net.au> Cc: freebsd-hackers@freebsd.org Subject: Re: Erorr: isa_dmainit(2, 1024) failed Message-ID: <Pine.BSF.4.05.9903081826490.313-100000@vmunix.psn.ie> In-Reply-To: <199903081740.JAA06967@dingo.cdrom.com>
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> Actually, fixing it "right" will be very difficult. I suspect that the > ISA DMA code will need a statically-allocated buffer to overcome this. > I've run into the same kind of problem when working on a driver for NetBSD recently. The solution would be to use NetBSD's BUS_DMA(9), but this card needs a DMA buffer which has *crazy* alignment and position requirements. One of them is that the buffer needs to be within the first 8MB, hence the same problem. The solution for me was to put in a call to steal the DMA buffer just after the VM system is up and before buffers get allocated (which doesn't happen in FreeBSD), so why not just use a solution like this? (I think in FreeBSD the right place would be init386()). Andy. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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