[coreboot] Re: Enable non-NVME devices in M.2 slot?

[Rafael Send]

Evening!
Alright so I built against the latest master, enabled all the root ports
(0-12), disabled the NVME (root port 8)? for good measure (although I also
tried with it remaining enabled).

I still don't see the device under either "pci" in the EFI shell or under
"lspci" once Ubuntu is booted.

I don't have any other PCI cards that I could test here, unfortunately.

How shall I go about debugging this further?  Can I get logs out of
coreboot somehow?

Cheers,
Rafael

On Sun, Dec 8, 2019 at 7:53 PM Rafael Send 
wrote:
> Hi,
> It's an M-key slot and I'm currently running an XPG SX8200 Pro in it right
> now, so it's definitely got x4 PCIe...
>
> R
>
> On Sun, Dec 8, 2019, 15:25 Matt B  wrote:
> > As somebody who's abused the hell out of pcie extenders (I have over
> > three meters of pcie-over-cheap-usb3.0-cable in one box) I've never had an
> > obvious issue so it seems pretty tolerant. You probably just won't get the
> > same transfer speed.
> >
> > I would check if any drives you have show up as being attached to pcie
> > instead of sata when in that slot.
> > Also double check it's keying. If the keying of the slot is such that it
> > can't even accept an nvme drive, then there's your answer right there.
> >
> > Sincerely,
> >     -Matt
> >
> > On Sun, Dec 8, 2019 at 6:12 PM Rafael Send 
> > wrote:
> > > Hey,
> > > I used the mini PCIe -> x1PCIe version with the same cable length from
> > > the same people to test the card in the WiFi slot successfully, so I doubt
> > > that it is a signal integrity problem.
> > >
> > > I'll try to build against coreboot master on Monday and see what happens.
> > >
> > > How can I get the sort of logs that would help here out of coreboot?
> > > I'll be building with Tianocore.
> > >
> > > Cheers,
> > > Rafael
> > >
> > > On Sat, Dec 7, 2019, 04:58 Nico Huber  wrote:
> > > > Hi Rafael,
> > > >
> > > > On 07.12.19 07:40, Rafael Send wrote:
> > > > > However, so far nothing I've done lets me detect the Sunix card if I
> > > >
> > > > try to
> > > > > put it in the NVME slot using this adapter
> > > > > https://www.adt.link/product/R42.html. I would think it should
> > > >
> > > > just show
> > > > > up under "lspci" like it does in the WiFi slot, but it does not.
> > > >
> > > > have you tried the adapter with another device yet? Though, even if it
> > > > did work, from above link:
> > > >
> > > > "1. All kinds of Motherboard and equipment condition such as signal
> > > >     driving ability is different, the results of our test does not
> > > >     guarantee that it is the same as your test results. You need to
> > > >     know, as long as using a extension cable, the signal will have a
> > > >     loss. The buyer who requires perfectly, please don't buy."
> > > >
> > > > So they know, that board design matters for the compatibility of their
> > > > adapter. I'm a mere software developer, so could be totally wrong about
> > > > this: PCIe rates are now that high that the trace length between chips
> > > > can get longer than a wavelength. Doesn't mean it can't work, but there
> > > > may be things to take special care of and I don't know if regular PCIe
> > > > ports are prepared for it. In other words, lightspeed might be too slow
> > > > to make things like this plug'n'play :D
> > > > > I have not tried the latest Coreboot / port yet, but I figured I
> > > >
> > > > might as
> > > > > well get some opinions on the subject.
> > > >
> > > > Still worth a shot, imho. You never know what a proprietary BIOS does.
> > > > And even if it doesn't work, coreboot logs can give some insight.
> > > >
> > > > Nico
> > >
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