linux-kernel - Re: [PATCH v2 0/8] OLPC 1.75 Keyboard/Touchpad fixes

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Message-ID: <20181031115413.GA14310@amd>
Date:   Wed, 31 Oct 2018 12:54:13 +0100
From:   Pavel Machek <pavel@....cz>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        James Cameron <quozl@...top.org>, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 0/8] OLPC 1.75 Keyboard/Touchpad fixes

Hi!

> > > > https://github.com/hackerspace/olpc-xo175-linux/wiki/How-to-run-an-up-to-date-Linux-on-a-XO-1.75
> > > > 
> > > > I didn't test it yet -- will do when I get home in the evening.
> > > > But
> > > > chances are it's good enough and I guess you'd be able to get it
> > > > working even if I messed up some details.
> > 
> > Instruction say make, but you really need to do make zImage and make
> > mmp2-olpc-xo-1-75.dtb .
> 
> Have you tried? I'm typically doing just a plain "make".
> 
> According to "make help", a plain "make" (assuming it's equivalent to
> "make all") includes "zImage" and "dtbs" targets.

I believe I did, but not 100% sure.

> > Instructions say "make -j", which is nice way to crash a machine. I
> > suggest "make -j 8" :-).
> 
> Holy... what sort of a machine do you have?

Thinkpad X220. Is it too big or too small? :-). 4 threads, so I
usually use -j 5, but -j 8 should be for my notebook and also bigger
servers.


> > Ok, I think I followed the instructions. I am using empty root
> > filesystem, just with /boot -- want to see kernel messages first
> > before I mess with the userland.
> > 
> > But I don't get kernel messages during boot:
> > 
> > OLPC 1B1, 512 MiB memory...
> > OpenFirmware Q4C02 EC Frimware 0.3.02
> 
> "Frimware" -- I assume you don't have a serial console hooked on? :)

Not :-(. Altrough.. maybe I do have that cable somewhere, I just never
used it.

> > Type any key to interrupt...
> > (but keys do not interrupt anything, ouch).
> 
> In my version of the OLPC OF the routine is replaced with one that only
> accepts the Escape key, because kids like to press random keys without
> really wanting a shell. Maybe try that one?

Ok, will try.

> > And that's it, cursor and no kernel messages.
> > 
> > Any ideas?
> > 
> > Could I get prepared binary zImage for testing?
> 
> https://github.com/hackerspace/olpc-xo175-buildroot/releases
> 
> Here's a SD card image that works for me. The topmost commit in the
> same repository is the build configuration that was used to generate
> it:

Kernel works for me with this one. (First boot userland boots, then
blinking cursor; next boot filesystem is corrupted. Hmm.) Feel free to
add "Tested-by:" to patches this uses.

> Note it is only going to boot off the SD card, because the root=
> argument is hardwired in the devicetree. Sorry about that -- I built
> the image before I noticed you're booting off an USB stick and I don't
> have the resources to regenerate the image at the moment.

No problem, I have SD cards here, too.

> If this won't boot for you, we may need fixes for older FW. Until then
> it might be a good idea if you just update to the latest one (it is as
> easy as booting the last version of the stock distro with a charged
> battery pack).

I'd need more instructions for firmware update. Or maybe ... lets
ignore that. SD card is fine, and I don't want to brick it.

I already broken it enough that keys need to be held during boot (or
it does not boot).

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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