From: coreboot-bounces+scott=notabs@coreboot.org
[mailto:coreboot-bounces+scott=notabs@coreboot.org] On Behalf Of
trevor.davenp...@gmail.com
Sent: Wednesday, January 26, 2011 07:57 PM
To: coreboot@coreboot.org
Subject: [coreboot] core boot ehci debug
Hi,
I've been trying to get coreboot to work a machine i have
(http://www.coreboot.org/pipermail/coreboot/2010-November/061987.html) but
have so far have not had any luck. I've tried most board types that are
similar but all result in the same scenario, flash the rom,
rebootnothing on screen.
This system does not have serial port available (the closest thing on the board
appears to be solder contacts labeled COMB). The
southbridge is a SB700. Is the EHCI Debug Port support usuable on these (the
wiki says WIP but it seems the code is there) and do
you think it would help to go this route?
Is there anything else you could suggest in helping me make any progress on
this board?
Cheers,
Trevor Davenport
--
Video comes very late in the sequence of events so watching for video is not a
good way to debug. Hopefully someone can answer your
EHCI debug port question. I would try to get the serial port going. If a volt
meter shows that any of the pads are at a negative
level, then you have RS-232 levels and only need to figure out which is tx and
rx. If there is only positive, then the pads probably
lead directly to the ITE SIO. If that were the case, you would have to somehow
invert tx rx. Boot with minimal memory. Make sure
you have included a video option rom. You could probably sanity check your
coreboot image by downloading simnow. It includes a model
'shiner_family10h.bsd', which is RS780/SB700, DDR2, ITE SIO board. There is
more simnow info at coreboot.org.
Thanks,
Scott
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