Re: [coreboot] Coreboot on Tyan S2892

[Jordan Crouse]

Peter Stuge wrote:
> Myles Watson wrote:
> > > > In case this turns out to be a dead end, what does porting a driver
> > > > to FILO involve?
> > >
> > > It depends on the requirements of the driver,
> >
> > Storage.  nvidia ck804 sata.
>
> Ugh. Probably painful. From linux/drivers/ata/sata_nv.c:
> No hardware documentation available outside of NVIDIA.
> This driver programs the NVIDIA SATA controller in a similar
> fashion as with other PCI IDE BMDMA controllers, with a few
> NV-specific details such as register offsets, SATA phy location,
> hotplug info, etc.
> CK804/MCP04 controllers support an alternate programming interface
> similar to the ADMA specification (with some modifications).
> This allows the use of NCQ. Non-DMA-mapped ATA commands are still
> sent through the legacy interface.
>
> There's no DMA infrastructure in FILO or libpayload.
> But the second paragraph seems to imply that PIO through legacy
> interface should work.

Its easy enough to  tell - if you look at the PCI device before it gets 
switched into NCQ mode the PCI config space should be immediately 
recognizable as a IDE part.

Jordan