OpenFirmware and Linux v5.0 on XO-1.75

[James Cameron]

On Fri, Apr 19, 2019 at 08:58:15AM +0200, Lubomir Rintel wrote:
> On Mon, 2019-02-25 at 20:00 +1100, James Cameron wrote:
> > On Sat, Feb 23, 2019 at 06:06:56PM +0100, Lubomir Rintel wrote:
> > > On Sat, 2019-02-23 at 10:52 +1100, James Cameron wrote:
> > > > On Fri, Feb 22, 2019 at 12:14:00PM +0100, Lubomir Rintel wrote:
> > > > > Also, which config? Mine is basically this:
> > > > > https://raw.githubusercontent.com/hackerspace/olpc-xo175-linux/lr/olpc-xo175/arch/arm/configs/olpc_xo175_defconfig
> > > > 
> > > > The config used by Fedora.
> > > > 
> > > > Can we work toward some kind of reproducible build?
> > > 
> > > Not sure what you mean here.
> > 
> > Sorry.  Configuring and building kernels is for me a rare thing to do,
> > and whenever I try I'm usually interrupted by something more urgent,
> > as I've quite a few other things I've got to do.  I'm still a newbie
> > at it because I can't dedicate the time.  [...]
> 
> So, over the last week or so, I spent some effort making this work with
> the OLPC RPM build tooling. Here's what I came up with:
> 
> http://v3.sk/~lkundrak/olpc/green_ears.jpeg

Thanks, that's fantastic.  I've mostly reproduced your work, and have
my build of your 5.0 kernel running on an XO-1.75 with an adjusted
Fedora 18 user space and a fixed root= argument.

> The kernel:
> 
>   git pull https://github.com/hackerspace/olpc-xo175-linux/ olpc-5.0
> 
> Based on vanilla v5.0.8, a few parts taken from olpc-4.8,
> olpc-3.0-arm, along with my defconfig and a couple of changes to
> support cross-build on Fedora 30. I've not tested native builds, I
> didn't dare to run it on the XO.

Pushed as http://dev.laptop.org/git/olpc-kernel/log/?h=olpc-5.0

My dmesg;
http://dev.laptop.org/~quozl/z/1hHiN5.txt

I used an Ubuntu 18.04 cross-build to make the kernel I'm using at the
moment, as our production builder is Fedora 18.  I've started to
iterate on a Fedora 30 builder, but I'm not sure I've got everything I
need.  Here's the packages I'm adding;

gcc-arm-linux-gnu binutils-arm-linux-gnu
rpm-build bison flex m4 make openssl-devel perl

> Firmware:
> 
>   git pull https://github.com/lkundrak/openfirmware/ lr/olpc-xo175-3
> 
> A couple more small fixups here and there since lr/olpc-xo175-2. The
> most notable fix is for a regression that caused the RTC to be cleared
> on each boot.

Pushed as
https://github.com/quozl/openfirmware/commits/lr/olpc-xo175-3

Released q4e00ja.rom from this as is;
http://dev.laptop.org/~quozl/q4e00ja.rom

Removed the dtcompat.fth fload and released q4e01ja.rom;
http://dev.laptop.org/~quozl/q4e01ja.rom

As the firmware will update on a standard system before the kernel
will boot, this seems an okay way to do it.  What do you think?

>   git pull https://github.com/lkundrak/dracut-modules-olpc/ master
> 
> There's a fix for assumptions about the mmc controller
> numbering. Also, to boot a FDT-based kernel the initramfs needs to
> avoid triggering the compat boot path (that lies about bootpath and
> disables the DT flattening).

Thanks.  I'm yet to use this, but plan to.

>   git pull https://github.com/lkundrak/olpc-utils/ v5.0
>   git pull https://github.com/lkundrak/olpc-utils/ master
> 
> Fixes the X11 video.

Thanks, yes, it does work, though I had to recreate the xorg.conf.d
symlink, not sure why.

Pushed as http://dev.laptop.org/git/projects/olpc-utils/log/?h=v5.1

Packaged as
http://dev.laptop.org/~quozl/olpc-utils-5.1.0-0.olpc.armv7hl.rpm
http://dev.laptop.org/~quozl/olpc-utils-5.1.0-0.olpc.src.rpm

> The patched packages are here: http://v3.sk/~lkundrak/olpc/
> The dracut-modules-olpc package needs to be installed prior to the
> kernel.

Oops, I should have read all this way before acting.  I got caught up
in code review.  Sorry.  I'll do another test using your binaries.

By the way, there's an interesting symptom on WiFi, a variable latency
on inbound ssh, also shows up as a latency staircase effect in
outbound "ping -n -i 0.200".

Also, power is not turned off on system halt.  I remember fixing that
once, so no biggie.

-- 
James Cameron
http://quozl.netrek.org/