Date: Tue, 08 Apr 1997 09:08:38 -0400 From: dennis <dennis@etinc.com> To: dg@root.com Cc: hackers@FreeBSD.ORG Subject: Re: pci_map_mem reports failure Message-ID: <3.0.32.19970408090836.00694a80@etinc.com>
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At 05:27 PM 4/7/97 -0700, David Greenman wrote: >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. Actually I'm porting to 2.2.1...... > > 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.) The error I'm getting is on line 1064 of FreeBSD 2.2.1 pci.c file. Perhaps one of our german readers can translate..... :-) Dennis
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