From owner-freebsd-hackers Mon Apr 7 17:27:01 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id RAA29300 for hackers-outgoing; Mon, 7 Apr 1997 17:27:01 -0700 (PDT) Received: from root.com (implode.root.com [198.145.90.17]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id RAA29293 for ; Mon, 7 Apr 1997 17:26:57 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by root.com (8.8.5/8.6.5) with SMTP id RAA06278; Mon, 7 Apr 1997 17:27:23 -0700 (PDT) Message-Id: <199704080027.RAA06278@root.com> X-Authentication-Warning: implode.root.com: localhost [127.0.0.1] didn't use HELO protocol To: dennis cc: hackers@FreeBSD.ORG Subject: Re: pci_map_mem reports failure From: David Greenman Reply-To: dg@root.com Date: Mon, 07 Apr 1997 17:27:23 -0700 Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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