Hi all,We have platforms that do not boot in 2.6.16, but boot OK with 2.6.15 (loop in ACPI code). After some investigations, I found this is due to pci buses that are described in the configuration, but not available in limited configurations.
These buses have a _STA method, but no _INI method.With 2.6.15, the _STA method is run, and as the bus is not present, the bus and all devices behind it are ignored. With 2.6.16, as no _INI method is provided for the bus, _STA method is not run, and then we loop when executing methods for devices behind the not present bus.
Having a look to ACPI specification, I could find nowhere the restriction that _STA method is called only when an _INI method is provided for the device:
"6.5.1 _INI (Init) ...If the _STA method indicates that the device is present, OSPM will evaluate the _INI for the device (if the _INI method exists) and will examine each of the children of the device for _INI methods. If the _STA method indicates that the device is not present, OSPM will not run the _INI and will not examine the children of the device for _INI methods. "
traces ----------------------------------------------- Device PC11 000060e4: 02 . . Name _HID 000060e9: 03 . . . PNP0A03 PCI Bus 0x030ad041 000060ee: 02 . . Name _UID 000060f3: 03 . . . 0x0b 000060f5: 02 . . Name _ADR 000060fa: 03 . . . 0x00 000060fc: 02 ---- 'PCI bus number setup by the BIOS' Method _BBN 00006102: 03 . . . 0x00 00006103: 03 . . . Return 00006104: 04 . . . . path: \_SB_.CSFF.IO15.B1__ 00006117: 02 ---- 'Dynamic_Statu' Method _STA 0000611d: 03 . . . 0x00 0000611e: 03 . . . If 00006120: 04 . . . . LEqual 00006121: 05 . . . . . path: \_SB_.CSFF.IO11.HUBD 00006134: 05 . . . . . 0x00 00006136: 04 . . . . Return 00006137: 05 . . . . . 0x0f 00006139: 03 . . . Return 0000613a: 04 . . . . 0x00 0000613c: 02 ---- 'Current Resource Setting' Method _CRS 00006142: 03 . . . 0x00 00006143: 03 . . . Return 00006144: 04 . . . . path: \_SB_.HLRS 0000614e: 03 . . . 0x01 00006150: 03 . . . 0x01 00006152: 02
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