[coreboot] coreboot Digest, Vol 107, Issue 24

Timothy Potter timothy.e.potter at gmail.com
Mon Jan 20 12:57:32 CET 2014

On Sat, Jan 18, 2014 at 12:52 AM, Ky?sti M?lkki wrote:
> On 01/17/2014 01:01 PM, Timothy Potter wrote:
> > Hi,
> >    I'm trying to get Coreboot with SeaBIOS running on a Chromebox. I
> > followed the page about compiling Coreboot for a Chomebook 550, assuming
> > they are similar in some respects.  Unfortunately none of the builds have
> > booted. Just the blue power light comes on at best.
> >    I'm wondering if anyone knows which is the USB Debug Port or the pin
> out
> > of the LPC bus connector?  I've got one of those cheap Mini PCI Express
> > POST diagnostic cards but can't work out how to wire up.  I've also got
> an
> > old Android phone with the ECHI debug gadget compiled into the kernel.
> I've
> > tried connecting that to every USB port on the Chromebox but never get
> any
> > output.
> >
> > Hope someone can help.
> >
> > Cheers,
> >    Tim.
> Hi Tim
> Did you apply the two patches for EHCI gadget available here:
> http://www.coreboot.org/EHCI_Gadget_Debug
> Try this without Chromebox first: Connect phone with any normal USB
> host. Run lsusb -v on the host to verify your Android exports USB debug
> descriptor. Then post system logs from both sides of the connection.
> Now for the physical USB port to use. If you can boot your Chromebox
> with the original flash image, a working port should appear as "usb
> 1-1.2" or "usb 2-1.2" in the system log when you connect any USB device.
> For coreboot configuration with Intel platform, HCD_INDEX=1 maps to
> 0:1d.0 and HCD_INDEX=2 maps to 0:1a.0. It's reversed order, like in the
> datasheets.
Hi Kyösti,
  Yes, I applied the patches, although I'm using kernel 2.6.32 so I had to
add some of the chunks manually.  You can see the changes here:


I may have got something wrong.

I suspect it's a problem on the phone side as the EHCI debug gadget doesn't
show up in lsusb.  When I have more time I'll post the system logs and try
patching and building a 3.0.3 kernel for the phone.  It's a Motorola Defy.
There doesn't appear to be any working kernel new than that.

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