Date: Sat, 20 Jul 1996 11:43:32 +0200 (SAT) From: John Hay <jhay@mikom.csir.co.za> To: hackers@FreeBSD.ORG (FreeBSD-hackers), davidg@FreeBSD.ORG Subject: Advice on PCI driver for RISCom/N2pci needed Message-ID: <199607200943.LAA12950@zibbi.mikom.csir.co.za>
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Hi I am busy looking at writing a driver for the SDL RISCom/N2pci card. The card uses the same Hitachi HD64570 chip as the Arnet and RISCom/N2 ISA cards and only have a 24 bit address bus, which means that while it is a bus master card, its DMA can only "work" in a 16MByte block. It does have a page register so you can select any 16M block to work in. At the moment it looks like the only option is to pre allocate a block of memory below 16M (maybe using the method BOUNCE_BUFFERS use???) and copy the mbufs in and out of that. Is there somebody with better/other ideas? John -- John Hay -- John.Hay@mikom.csir.co.za
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