[coreboot] Laptop: HP/Compaq nc6320: Nothing on serial.

Denis 'GNUtoo' Carikli GNUtoo at no-log.org
Wed Jan 16 17:58:31 CET 2013


My M4A785T-M is currently not available for developing, due to a
very long fsck(it musn't reboot,restarting from scratch won't speed it
up more).

In the meantime I realized that my HP/Compaq nc6320 was very close to
the Roda rk886ex, only the superio was different: the Roda rk886ex seem
to have 2 superios and one of them is the SMSC LPC47N227, the superio
of the nc6320 is the SMSC LPC47N217. The ec is also different...

So I tried to get serial output on the nc6320, hopeing that the ec
wouldn't interfer at such early startup, but it seem that or I did
something wrong, or the ec is interfering.
My last try to make serial work is attached (patch 0001).

Then after that I tried to find a way to have a feedback, resetting the
PCI in a while loop didn't make any led blink.
However someone named phcoder on the #coreboot IRC channel gave me some
example code for grub that should light the keyboards leds(like caps
lock for instance),it's available in patch 0002, but that failed
to light any led...

The informations gathered on the device are here:

About the ec:
There is an ec rom inside the BIOS(which can be unpacked with the
following python uttility:

Since the ec doesn't seem to have access to the flash, I wonder how to
send such rom to the ec?
maybe putting it in RAM at a fixed location is enough?
Since I don't have SerialIce working either I cannot look at how the
BIOS does it.

Does anyone have an idea on how to proceed at that point?
Is my serial Init code wrong?
Or can the EC prevent serial output?

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