Date: Mon, 4 Jan 2010 10:59:13 -0500 From: John Baldwin <jhb@freebsd.org> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: freebsd-acpi@freebsd.org Subject: Re: FreeBSD 8.0 hangs on boot with ACPI enabled Message-ID: <201001041059.13322.jhb@freebsd.org> In-Reply-To: <20100102220648.GB1616@uriah.heep.sax.de> References: <20091230082556.GD1637@uriah.heep.sax.de> <200912301122.28030.jhb@freebsd.org> <20100102220648.GB1616@uriah.heep.sax.de>
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On Saturday 02 January 2010 5:06:48 pm Joerg Wunsch wrote: > As John Baldwin wrote: > > > OTOH, I'm not sure why initializing ACPI is trashing the BAR. If > > you want, you can try to narrow down at what point the BAR gets > > reset to 0. > > Any hints about where to start doing this? I could probably run the > machine through a remote GDB, but haven't been doing that for years > (and the machine doesn't have a FireWire interface either so I'd have > to use plain RS-232), so I'd preferrably start with a bit of "printf > debugging" first. If someone can give me some hints about which > files/functions to touch, I'd be grateful. You can probably start with acpi_attach() adding a printf at the top of that and after it calls bus_generic_attach(). You will want to figure out your device's PCI address and use pci_cfgregread() to fetch the value of the BAR at each printf. -- John Baldwin
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