Date: Mon, 07 Apr 1997 16:28:12 -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: <199704072328.QAA05858@root.com> In-Reply-To: Your message of "Mon, 07 Apr 1997 19:19:59 EDT." <3.0.32.19970407191956.009ab270@etinc.com>
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>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...)? 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. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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