Ingo Molnar wrote: > * Yinghai Lu <yinghai@xxxxxxxxxx> wrote: > >>> This feels like a hack that accidentally covers up the problem. I >>> don't think we understand what's happening well enough. >> yes, we need to figure out why when acpi=on, those BAR are cleared, >> before pci code try to scan and read BAR. (node early pic print out >> untouched, but after APCI subsystem is enabled, those BAR got >> clearred) > > I'm wondering, how did it get cleared - some AML script told the kernel > to clear it? [ 0.012392] ACPI: Core revision 20090521 ... [ 0.117217] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it [ 0.117223] ACPI: bus type pci registered [ 0.117292] PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255 [ 0.117297] PCI: Not using MMCONFIG. [ 0.117301] PCI: Using configuration type 1 for base access [ 0.118064] bio: create slab <bio-0> at 0 [ 0.118995] ACPI: EC: Look up EC in DSDT [ 0.125066] ACPI: BIOS _OSI(Linux) query ignored [ 0.127077] ACPI: EC: non-query interrupt received, switching to interrupt mode [ 0.632002] ACPI: EC: missing confirmations, switch off interrupt mode. [ 0.793109] ACPI: Interpreter enabled [ 0.793114] ACPI: (supports S0 S3 S4 S5) [ 0.793139] ACPI: Using IOAPIC for interrupt routing [ 0.793193] PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255 [ 0.795871] PCI: MCFG area at e0000000 reserved in ACPI motherboard resources [ 0.806419] PCI: Using MMCONFIG at e0000000 - efffffff [ 0.812767] ACPI: EC: GPE = 0x18, I/O: command/status = 0x66, data = 0x62 [ 0.812772] ACPI: EC: driver started in poll mode [ 0.813206] ACPI: No dock devices found. [ 0.813879] ACPI: PCI Root Bridge [PCI0] (0000:00) could be ACPI EC AML code related. because with pci=nommconf, the BARs still get cleared. need the reporter to boot with acpi.debug_layer=0x400000 acpi.debug_level= to get more info YH -- 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
