Date: Tue, 28 Oct 2008 00:47:42 +0200 From: Serge Semenenko <serge@a-1.com.ua> To: freebsd-acpi@freebsd.org Cc: Alexander Motin <mav@freebsd.org> Subject: Re: PCIe bridges resources disappearing with ACPI enabled. Message-ID: <4906450E.4030700@a-1.com.ua> In-Reply-To: <200810271142.59666.jhb@freebsd.org> References: <4903A120.7040003@FreeBSD.org> <200810271142.59666.jhb@freebsd.org>
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John Baldwin wrote: > On Saturday 25 October 2008 06:43:44 pm Alexander Motin wrote: > >> Hi. >> >> I have spent whole day trying to investigate strange problem of my Acer >> TM6292 laptop (965GM+ICH8M). When booted with ACPI enabled, all three >> of PCIe-to-PCIe bridges appearing completely without I/O resources: >> pcib1: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0 >> pcib1: domain 0 >> pcib1: secondary bus 2 >> pcib1: subordinate bus 3 >> pcib1: I/O decode 0x0-0x0 >> pcib1: no prefetched decode >> ... >> At the same time, with ACPI disabled, resources are present. There are >> some different problem with IRQ in that case, but it is another >> question, not so interesting to me. >> >> I have tried both IO and memory mapped PCIe configuration registers >> without success. >> >> I have made heavy digging trying to find where resources disappearing. I >> have even added debug printing inside pcireg_cfgwrite() and >> pciereg_cfgwrite() to trace if somebody erases it and found nothing. >> Nothing writes into that devices configuration registers. >> > > The SMI handle could be clearing the BARs when ACPI is enabled for some > reason. Windows and Linux are smart enough to alloc resources for bridges, > but FreeBSD isn't yet. > > Thanks for a good tip. Elimination of "Store (Zero, SMIC)" string from ASL code has solved the problem.
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