On Friday, April 24, 2015 04:08:31 PM Suravee Suthikulpanit wrote:
On 4/16/15 20:45, Zheng, Lv wrote:
Before back porting this to ACPICA, let me ask one simple question. According to the spec, the _CLS is optional and PCI specific. So why should we implement it in ACPICA core not OSPM specific modules? If this need to be implemented in ACPICA, then what about the following device identification objects? _DDN, _HRV, _MLS, _PLD, _STR, _SUN
Thanks and best regards -Lv
Hi,
Sorry for late reply. As for the justification for introducing the _CLS support in the ACPICA, this is mainly because ACPI does not currently define _CID for certain device classes, which used to mostly be PCI devices. Instead, ACPI spec mentioned that _CLS can be used for loading generic drivers on hardware that is compatible with PCI-defined device classes, but that is not implemented on the PCI bus (and is therefore enumerated by ACPI.)
I think it would be good to point to the particular part of the spec making that provision. In what section is that mentioned, exactly?