[coreboot] Lenovo Thinkpad X201: cannot boot encrypted Debian w/Coreboot & GRUB2
sam.kuper at uclmail.net
Fri Mar 24 04:16:27 CET 2017
On 23/03/2017, Arthur Heymans <arthur at aheymans.xyz> wrote:
>> I tried again, this time with SeaBIOS instead of GRUB2 as the primary
>> payload, and with CoreInfo as a secondary payload. As above, I
>> selected "Use native graphics initialization" under "Devices" within
>> `make nconfig`. (See attached .config .)
>> The result was the same as above: the backlight came on, but there was
>> nothing displayed on the screen.
> I would not be too surprised if native graphic init is invalid for
> Nehalem, since looks like a rough copy of ivy/sandy bridge...
> (A quick look at the code tells me computing PLL divisors is too rough to
> be right in all cases. When it is too much out range for a display a lit
> up black screen is typically all you get...)
Interesting. Thank you very much for looking into this.
I wonder if this is a regression? The wiki states, "VGA Option ROM
(optional): you need it if you want graphics in SeaBIOS but most
payloads (e.g. GRUB2) work just fine without it (text mode or
That statement resulted from the following edits:
GNUtoo in 2013:
GNUtoo in 2013:
phcoder in 2013:
phcoder in 2014:
Kl3 in 2015: https://www.coreboot.org/index.php?title=Board:lenovo/x201&diff=next&oldid=16692
So, it would seem that during 2013-2015, native graphics init became
operational within Coreboot for the X201. So, if it was working then,
but isn't working now, that would seem to indicate a regression. I
have CC'd the people who I understand are the authors of those
commits. I would be grateful if anyone can shed light on this :)
> One option is to extract the option rom from vendor bios and use that
> for init.
True. I was hoping to avoid this, but you are right that I should give
it a go (at least, to rule out whether any other issues are causing
the blank screen).
> Another is to fix up that native graphic init.
That is beyond my present skill level, I fear ;)
> Last option is hook up libgfxinit, an alternative Intel display init
> code written in ada/spark, which might set up display correctly...
Nice. I will look into that when I get a chance. It might take me a
while. I haven't built an Ada toolchain before. Would be great if it
>> Is there anyone on the list who has Coreboot working on an X201 who
>> would be willing to share their .config file, so that I might see how
>> they succeeded where I am failing?
This question still stands, especially for those I have CC'd, who seem
to have been successful with Coreboot and native graphics
initialization on the X201 :)
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