[SeaBIOS] HPET configuration in Seabios
Jan Kiszka
jan.kiszka at siemens.com
Mon Aug 29 13:12:26 CEST 2011
On 2011-08-29 13:05, Jan Kiszka wrote:
> On 2011-08-29 13:00, Avi Kivity wrote:
>> On 08/29/2011 01:25 PM, Jan Kiszka wrote:
>>>>
>>>> Can't seabios just poke at the hpet itself and see if it exists or not?
>>>>
>>>
>>> Would be hard for the BIOS to guess the locations of the blocks unless
>>> we define the addresses used by QEMU as something like base + hpet_no *
>>> block_size in all cases.
>>>
>>
>> Currently we have a fixed address. We could do:
>>
>> if available in fw_cfg:
>> use that (may indicate no hpet)
>> elif fixed address works:
>> use that
>> else
>> no hpet
>
> Currently, we also only have a single HPET block, but that's just
> because of some QEMU limitations that will vanish sooner or later. Then
> nothing will prevent multiple "-device hpet,base=XXX".
That said, some HPET probing (without any fw_cfg) may be a short-term
workaround to fix Seabios until we defined The solution for
communicating HPET block configurations.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
More information about the SeaBIOS
mailing list