Date: Mon, 07 Apr 1997 17:27:23 -0700 From: David Greenman <dg@root.com> To: dennis <dennis@etinc.com> Cc: hackers@FreeBSD.ORG Subject: Re: pci_map_mem reports failure Message-ID: <199704080027.RAA06278@root.com>
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Dennis: >>I've noticed that pci_map_mem() reports a failure (in the form of a >>display to the screen) if the PCI memory space is below 1 MB (dos >>space), but that the function returns OK and a virtual mapping is >>returned as well. There's a comment (in german) in the source, and >>my German is rather weak (there seems to be a reference to PCI- >>PCI bridges) .....is this a real failure, a warning, or does FreeBSD >>not support PCI memory in the DOS hole (not that you'd actually >>WANT to put it there...)? To which I said: > The test for < 1MB should only be for the < 1MB PCI memory type, but >isn't strictly necessary...I'm not familiar with what the PCI spec has to >say about it. The function ultimately calls pmap_mapdev() which has no >trouble mapping any physical address. It just occured to me that you're probably using 2.1.x, so this bug fix is probably of interest: ---------------------------- revision 1.56 date: 1996/10/14 13:04:34; author: se; state: Exp; lines: +4 -2 pci_map_mem() did a too restrictive check on the mapping type: PCI_MAP_MEMORY_TYPE_32BIT_1M should be accepted as well as PCI_MAP_MEMORY_TYPE_32BIT (and now is). (Problem reported by David Greenman.) ---------------------------- -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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