[coreboot] Chromebox debugging.
timothy.e.potter at gmail.com
Fri Jan 31 10:03:59 CET 2014
Sorry, I reread your first reply and it became clear what you meant when
looking on the Chomebox's /var/log directory. I found the port at the back
corner of the Chromebox is numbered 2-1.2. None of the external ports
connect as 1-1.2. Connecting the phone with the EHCI debug device enabled
kernel to the 2-1.2 port and booting Ubuntu on the Chromebox I see the
following in kmesg:
[ 2.008799] usb 2-1.2: new high-speed USB device number 3 using ehci_hcd
[ 2.031628] atkbd serio0: atkbd: SETLEDS failed
[ 2.049059] init: plymouth main process (93) killed by ABRT signal
[ 2.049409] init: plymouth-splash main process (398) terminated with
[ 2.094946] usb 2-1.2: unable to read config index 0 descriptor/start:
[ 2.097301] usb 2-1.2: chopping to 0 config(s)
[ 2.099611] usb 2-1.2: New USB device found, idVendor=0525,
[ 2.099615] usb 2-1.2: New USB device strings: Mfr=0, Product=0,
[ 2.100136] usb 2-1.2: no configuration chosen from 0 choices
I can post the full logs if needed but they are quite long.
I tried different values for CONFIG_USBDEBUG_HCD_INDEX on the Coreboot
build. I tried values of 0,1 & 2 but still didn't see any output on the
EHCI debug device with 'cat /dev/ttyGS0'
On Fri, Jan 24, 2014 at 4:41 PM, Kyösti Mälkki <kyosti.malkki at gmail.com>wrote:
> On 01/24/2014 12:18 PM, Timothy Potter wrote:
>> Sorry for not including all you asked for Kyösti, I've not had much time
>> to spend on this. So you are saying if lsusb -v reports a 'Debug
>> descriptor' I should be able to use that port as the EHCI debug port on
> I think my first reply was quite clear on what information I need to
> assist you solve it. But I am too close to see if some obvious details from
> my instructions were missing.
> This is more easily solved if you come to discuss on #coreboot. You should
> then write a tutorial for our wiki or at least reply here with the steps
> were you went wrong the first time.
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