Re: SATA AHCI driver head banging.
Adam Lackorzynski <[email protected]>
| Newsgroups | gmane.comp.micro-kernel.l4.devel |
|---|---|
| Message-ID | <[email protected]> |
Hi, On Fri Jul 20, 2012 at 16:07:46 -0700, Daniel Waddington wrote: > I am trying to build a SATA driver for our Fiasco.OC personality. > The h/w is a Intel 82801J IOCH in a PC platform. > > I get can pick up the device in the PCI, get BAR5 and map in the > control registers. I then initialize the card (into AHCI mode), set > up memory (command list and command tables) and try to do an > IDENTIFY_DEVICE command. The command issues, and returns a PIO > Setup FIS (type 5f). PxTFD.STS.DRQ=1 PxTFD.STS.BSY=0 PxSERR=0 > PxSACT=1. The PIO setup FIS indicates a transfer count of 512 bytes > (which is correct). All good so far, but then no interrupt happens > and no more FISes appear - and I don't know what to do next. The > same behavior occurs on another PC platform with a IOCH9 controller. > > I have not done anything w.r.t. configuring or re-routing IRQs in > the PCI subsystem (a black hole to me). Is there something that is a > must that I'm clearly missing here?? I'd think it has something to do with PCI. The hint I could give is that you put your driver code into an L4Re task and check if it's better there? That could give a direction. Adam -- Adam [email protected] Lackorzynski http://os.inf.tu-dresden.de/~adam/