From owner-freebsd-current@FreeBSD.ORG Tue Sep 9 07:05:50 2008 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3C2111065676 for ; Tue, 9 Sep 2008 07:05:50 +0000 (UTC) (envelope-from peter@wemm.org) Received: from wr-out-0506.google.com (wr-out-0506.google.com [64.233.184.225]) by mx1.freebsd.org (Postfix) with ESMTP id 01B9C8FC2B for ; Tue, 9 Sep 2008 07:05:49 +0000 (UTC) (envelope-from peter@wemm.org) Received: by wr-out-0506.google.com with SMTP id c8so915498wra.27 for ; Tue, 09 Sep 2008 00:05:49 -0700 (PDT) Received: by 10.142.232.20 with SMTP id e20mr5627120wfh.237.1220943948676; Tue, 09 Sep 2008 00:05:48 -0700 (PDT) Received: by 10.142.255.21 with HTTP; Tue, 9 Sep 2008 00:05:48 -0700 (PDT) Message-ID: Date: Tue, 9 Sep 2008 00:05:48 -0700 From: "Peter Wemm" To: "John Baldwin" In-Reply-To: <200809081650.38774.jhb@freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <200809021033.55033.jhb@freebsd.org> <200809081650.38774.jhb@freebsd.org> Cc: freebsd-current@freebsd.org, Christian Weisgerber , Pascal Hofstee Subject: Re: No root filesystem X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Sep 2008 07:05:50 -0000 On Mon, Sep 8, 2008 at 1:50 PM, John Baldwin wrote: > On Tuesday 02 September 2008 01:41:24 pm Pascal Hofstee wrote: >> On Tue, Sep 2, 2008 at 4:33 PM, John Baldwin wrote: >> > This explains k8temp. So my earlier test patch to Christian only checked >> > on i386 which is why it didn't find an issue before. Try the updated >> > patch at http://www.FreeBSD.org/~jhb/patches/pcie.patch >> > >> > This does PCI config reads using both methods and panics if it doesn't >> > get the same result. >> >> I had to adjust the patch slightly by actually initializing edata to >> -1 to get the kernel to actually build (WARNS was complaining about >> possibly uninitialized variable edata). I then booted the resulting >> kernel and got the following boot log: >> >> [snip earlier parts of boot log] >> acpi0: <090607 RSDT1001> on motherboard >> PCIe: Memory Mapped configuration base @ 0xe0000000 >> ioapic0: routing intpin 9 (ISA IRQ 9) to vector 48 >> acpi0: [MPSAFE] >> acpi0: [ITHREAD] >> acpi0: Power Button (fixed) >> panic: pci_cfgread(0:24:0, 11, 1) => 0x6, 0xff >> cpuid = 0 >> >> According to pciconf -lv on a working kernel device 0:24:0 is the >> following: hostb0@pci0:0:24:0: class=0x060000 card=0x00000000 >> chip=0x11001022 rev=0x00 hdr=0x00 >> vendor = 'Advanced Micro Devices (AMD)' >> device = '(K8) Athlon 64/Opteron HyperTransport Technology >> Configuration' >> class = bridge >> subclass = HOST-PCI >> >> Which matches perfectly with the first previously mentioned missing >> devices that are normally attached to pcib0. > > So Linux has a rather gross work-around for this (it's a hardware bug) where > they check all the slots on bus 0, and if a device isn't found via MCFG, it > falls back to using the old style config access. That still doesn't explain > the ata issue though. Let me see if I can come up with a patch for this > issue first, and then we can move on to the ATA one. :-( > > Try http://www.FreeBSD.org/~jhb/patches/pcie_mcfg_k8.patch For what its worth, my desktop loses 4 pci devices when pcie cfgmethod is enabled. My X server won't start. I'm guessing this patch will fix it, but I'll know tomorrow. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV "All of this is for nothing if we don't go to the stars" - JMS/B5 "If Java had true garbage collection, most programs would delete themselves upon execution." -- Robert Sewell