On Sunday 16 December 2007 06:59:39 pm Shaohua Li wrote: > On Sun, 2007-12-09 at 23:02 -0500, Mike Houston wrote: > > On Mon, 10 Dec 2007 10:31:27 +0800 > > Shaohua Li <shaohua.li@xxxxxxxxx> wrote: > > > This should exist in previous kernel (before we remove acpi > > > motherboard driver) too. Basically it's a broken BIOS. Could below > > > patch work around it? > > > > > > Thanks, > > > Shaohua > > > > > > Index: linux/drivers/pnp/system.c > > > =================================================================== > > > --- linux.orig/drivers/pnp/system.c 2007-12-10 > > > 10:17:46.000000000 +0800 +++ linux/drivers/pnp/system.c > > > > Thanks Shaohua, I tested this as well and it appears to have worked > > around the issue for me. > > > > Now, in dmesg, I get: > > > > system 00:01: ioport range 0x290-0x29f has been reserved > > (...) > > system 00:01: ioport range 0x290-0x294 could not be reserved > > > > In /proc/ioports I see: > > > > 0290-029f : pnp 00:01 > > 0290-0297 : it87 > > 0290-0297 : it87 > Unfortunately this can't solve all such issues. > > Adam & Bjorn, > Could we just reserve IO ports >= 0x1000 in pnp system driver? The > purpose of the driver is to avoid resource conflict with PCI device, and > PCI device can't user io port < 0x1000. The purpose of the PNP system driver is to avoid conflicts with *all* devices. And if the PNP core were a little smarter, we wouldn't need the system driver at all. We don't have one for PCI -- the PCI core manages resources for all PCI devices, even ones that have no driver. Why is 0x1000 a magic number? drivers/acpi/motherboard.c used to ignore IO port ranges that ended below PCIBIOS_MIN_IO (== 0x1000 for most architectures). I don't think Linux will assign IO ports below PCIBIOS_MIN_IO to a PCI device, but the BIOS could, and I've seen CardBus devices below PCIBIOS_MIN_IO. I think having drivers/pnp/system.c ignore resources below PCIBIOS_MIN_IO would be a hack that happens to cover up problems like this without understanding the real cause. Bjorn - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
