Date: Thu, 25 Sep 2008 08:35:35 -0400 From: John Baldwin <jhb@freebsd.org> To: Navdeep Parhar <nparhar@gmail.com> Cc: freebsd-current@freebsd.org, Jia-Shiun Li <jiashiun@gmail.com> Subject: Re: Unable to boot Asus P5QL-EM w/ acpi enabled Message-ID: <200809250835.36444.jhb@freebsd.org> In-Reply-To: <20080925071118.GA8984@insightsol.com> References: <1d6d20bc0809170846g69311401j7f93f97969756e43@mail.gmail.com> <1d6d20bc0809242142ge545896u332cc8e23212383a@mail.gmail.com> <20080925071118.GA8984@insightsol.com>
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On Thursday 25 September 2008 03:11:18 am Navdeep Parhar wrote: > On Thu, Sep 25, 2008 at 12:42:38PM +0800, Jia-Shiun Li wrote: > > On Thu, Sep 25, 2008 at 1:35 AM, John Baldwin <jhb@freebsd.org> wrote: > > > On Wednesday 24 September 2008 01:11:31 pm jiashiun li wrote: > > >> > > >> I did a binary search and found the problem lies between 2008-08-22 > > >> and 2008-08-23. Here is my note: > > >> > > > If you grab the latest bits from HEAD you can use 'hw.pci.mcfg=0' to disable > > > memcfg. > > > > > > > Thanks, quick search the mailing list revealed some cases and your > > solution just a few days ago. I should have followed the mailing list > > more carefully. ;) > > > > Just curious, any idea why the memory mapped configuration prevents > > kernel from booting? Maybe buggy hardware, acpi code, or combination > > of both that users can help testing to find the cause? > > I would like to put in a me-too here. I've been using hw.pci.mcfg=0 > since it was introduced but I still don't know where exactly the problem > is, or how to pinpoint it (bad bios/bad hardware/bad phase of the > moon/etc). The bleeding versions of other OS'es seem to work out of the > box, though that doesn't mean much - I'm not sure what they do inside. I'm not sure. Probably other OS's aren't using this a lot yet so it is just buggy BIOS. Linux has a rather silly SMAP-related check (requires an explicit SMAP region that covers the memcfg area) that effectively disables memcfg on most boxes, so Linux probably isn't using it on your hardware either. -- John Baldwin
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