[SeaBIOS] DSDT: SMC device node (was: Fix HPET _CRS Method)

[Alexander Graf]

On 12.12.2012, at 01:30, Kevin O'Connor wrote:

> On Tue, Dec 11, 2012 at 09:53:47AM -0500, Gabriel L. Somlo wrote:
>> On Tue, Dec 11, 2012 at 09:33:21AM +0100, Alexander Graf wrote:
>>>> (1) as suggested add a special detection register to our applesmc
>>>>     emulation.
>>> 
>>> This means we are different than real hw.
>>> 
>>>> (2) find a spare bit in q35, next to the present bits for
>>>>     serial/parallel/floppy
>>> 
>>> Which means we differ from real hw -> bad.
>>> 
>>>> (osx wouldn't boot on piix4 anyway,
>>>>     so we don't have to care, right?)
>>> 
>>> It could, but you need to manually add an lpc device. I don't think we really care about the piix4 case though :).
>>> 
>>>> (3) use fw_cfg.
>>>> 
>>>> (1) + (2) are easy to handle from AML code.
> [...]
>> What do you guys think ?
> 
> How about generating an SSDT with just the AppleSMC info in it, and
> then have qemu pass the SSDT into SeaBIOS using the existing ACPI
> table passing mechanism when the device is present.

That would mean we move the present detection to SeaBIOS which also simply talks to fw_cfg. So it doesn't really buy us anything over an _STA function, does it?


Alex