Date: Mon, 25 Apr 2011 15:09:47 -0400 From: John Baldwin <jhb@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: freebsd-arch@freebsd.org Subject: Re: Changing how PCI-PCI bridges do resource allocation Message-ID: <201104251509.47482.jhb@freebsd.org> In-Reply-To: <4DAE9B86.8040106@FreeBSD.org> References: <mailpost.1303239057.1899175.75529.mailing.freebsd.arch@FreeBSD.cs.nctu.edu.tw> <4DAE9B86.8040106@FreeBSD.org>
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On Wednesday, April 20, 2011 4:38:30 am Alexander Motin wrote: > Hi. > > On 19.04.2011 21:50, John Baldwin wrote: > > I've already had at least one testing report that this fixes the issues with > > some machines' BIOS clearing the I/O windows on some PCI-PCI bridges when ACPI > > is enabled as this code re-discovers the original windows and programs them > > correctly. More testing would be good however. > > I would like this helped my Acer TM6292 which also has alike problems > with missing PCIe bridge resources, but unluckily it doesn't. > > Here is verbose dmesg when my system uses this dirty hack: > http://people.freebsd.org/~mav/tm6292_pcie.patch > to restore bridges resources to the pre-ACPI state: > http://people.freebsd.org/~mav/dmesg.boot.hacks > > Here is respective `pciconf -lvcb` output: > http://people.freebsd.org/~mav/pciconf.hacks > > Here is dmesg with patches, but without NEW_PCIB: > http://people.freebsd.org/~mav/dmesg.boot.olbpcib > > Here is dmesg with patches with NEW_PCIB: > http://people.freebsd.org/~mav/dmesg.boot.newpcib Ah, your problem is we pick bad ranges when we alloc fresh resources for your bridges. I am working on making that better for ACPI, but for now you can try setting hw.acpi.host_mem_start to a value like '0xf0000000' in loader.conf. Although, it looks like it is not being honored currently. Try adding a printf in acpi_pcib_alloc_resource() in sys/dev/acpica/acpi_pcib_acpi.c to log the type, start, and end of each resource range. -- John Baldwin
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