[coreboot] Fwd: Intel Leaf Hill Coreboot Trouble

[Tahnia Lichtenstein]

Hi Cameron, coreboot,

Yes I did indeed intend to reply to all in my previous mail, apologies :)
So the previous two messages are now also included in this thread.

I've gone through the U-Boot readme and I see what you mean. However, with
the uboot patch that Intel provides, the CONFIG_OF_EMBED option is enabled
instead of CONFIG_OF_SEPARATE, like the U-Boot instructions suggest. The
Intel-provided patch however does not change the manner in which the
coreboot payload is included, i.e. the patch does not cause this command to
be issued during coreboot build:
./build/util/cbfstool/cbfstool build/coreboot.rom add-flat-binary -f
u-boot-dtb.bin -n fallback/payload -c lzma -l 0x1110000 -e 0x1110000

So after tweaking my U-Boot build to force the include of the coreboot
video framebuffer (which I don't think was a problem previously, but it's
included explicitly now, just for in case), I built U-Boot and it only
produces u-boot.bin, but not u-boot-dtb.bin (contrary to expected result
from readme). Thereafter I built coreboot with payload set to "None" via
make menuconfig, and thereafter ran the above CBFS command (but using
u-boot.bin instead of u-boot-dtb.bin). This build of coreboot + U-Boot
still does not detect any USB controller, and I also get the same SPI bus
error that you do after running "sf probe", as follows:

=> usb start
starting USB...
No controllers found
=> sf probe 0
Invalid bus 0 (err=-19)
Failed to initialize SPI flash at 0:0 (error -19)
=> sf probe 1
Invalid bus 0 (err=-19)
Failed to initialize SPI flash at 0:1 (error -19)

So from what I can tell, I did everything the instructions said to
propagate the coreboot device tree to U-Boot. Can anybody tell me how do I
know whether my coreboot device tree was propagated correctly to my U-Boot
payload?

Many thanks!
Tahnia

On Tue, Oct 10, 2017 at 1:43 PM, Cameron Craig 
wrote:
> Hi Tahnia,
>
> Did you mean to reply without including [e-mail]? If you did
> mean to include them I would just reply to my message again, except hit
> Reply All J The mailing list may have advice on this
>
> In the meantime, this is what led me to believe it is a device tree issue:
> https://github.com/u-boot/u-boot/blob/master/doc/README.x86#L405
>
> “With the default configuration, U-Boot is set up to use a separate Device
> Tree Blob (dtb).”
>
> We are booting from SPI flash and U-Boot also fails to find it L See log
> attached (not that it’s that interesting)
>
> It’s still early days, haven’t looked into this in depth yet. I’m not
> ruling out anything at the moment
>
> Cheers,
>
> Cameron
>
> Cameron Craig | Graduate Software Engineer | Exterity Limited
> tel: [phone] <+44%201383%20828250> | fax:
> e: [e-mail] | w: www.exterity.com
>
> *From:* Tahnia Lichtenstein [mailto:[e-mail]]
> *Sent:* 10 October 2017 10:06
> *To:* Cameron Craig
> *Subject:* Re: [coreboot] Intel Leaf Hill Coreboot Trouble
>
> Hi Cameron,
>
> I may be wrong, but I don't think it is related to the device tree .
>
> The reason is because there is a device tree configured in the coreboot
> release (see coreboot\src\mainboard\intel\leafhill\devicetree.cb) and to
> the best of my understanding, the device tree information gets passed from
> coreboot to the payload during run-time. So I think U-Boot has access to
> this device tree.
>
> Another reason is because I connected a SATA SDD to the board, and this
> drive is detected by U-Boot... If U-Boot had no device tree, then it would
> not be able to detect the SSD, I think. (See attached log for U-Boot serial
> output.)
>
> So my thoughts are that it is a USB specific problem in U-Boot... judging
> from some U-Boot posts it seems that other people also struggle to get USB
> working. So yes, I think you are correct in saying the U-Boot mailing list
> is a better place to try solve this USB-related problem :)
>
> I also tried some other self-compiled payloads in the meantime, which I
> had different trouble with, and started a new thread for those.
>
> Tahnia
>
> On Fri, Oct 6, 2017 at 5:42 PM, Cameron Craig 
> wrote:
>
> Hi Tahnia,
> > I am unfortunately not able to help you, since I myself am still new to
>
> coreboot (and to BIOS development in general).
> No worries, we'll get there eventually :)
> > When you ran the Intel-provided version (stitched with the Windows
>
> tool), did you experience any similar problems with the USB controller in
> U-Boot? If so, did you manage to solve it?
> We are looking at this at the moment. Early investigation suggests that
> U-Boot needs a device tree for Leaf Hill. Without that, U-Boot isn't aware
> of ant USB controllers, SPI Flash, PCI devices or anything.
> That's all I know at the moment, you might be better asking in the U-Boot
> mailing list.
>
> Unfortunately it looks like Intel don't bother providing a device tree for
> Leafhill. So we may end up writing our own, which I hear is a bit
> pernickety.
>
> Cheers,
> Cameron
>
> Cameron Craig | Graduate Software Engineer | Exterity Limited
> tel: [phone] | fax:  | mobile:
> e: [e-mail] | w: www.exterity.com
>
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