linux-kernel - Re: [PATCH v4 0/20] MMP platform fixes

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Message-ID: <dc775f9fd360ecbd3e4c00c02c9ff6e655502d0a.camel@v3.sk>
Date:   Sun, 02 Dec 2018 13:07:54 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>
Cc:     arm-soc <arm@...nel.org>, Eric Miao <eric.y.miao@...il.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Pavel Machek <pavel@....cz>, quozl@...top.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/20] MMP platform fixes

On Fri, 2018-11-30 at 15:44 -0800, Olof Johansson wrote:
> Hi,
> 
> On Wed, Nov 28, 2018 at 10:39:06PM +0100, Arnd Bergmann wrote:
> > On Wed, Nov 28, 2018 at 6:53 PM Lubomir Rintel <lkundrak@...sk> wrote:
> > > Hi,
> > > 
> > > this series contains contains a bunch of MMP2 platform fixes.
> > > 
> > > Previous spins of the patch set were sent out over the course of last
> > > three months to the MMP platform maintainers, with Arnd and
> > > linux-arm-kernel@...ts.infradead.org on copy.
> > > 
> > > Unfortunatelly, MMP maintainers (Eric Miao and Haojian Zhuang) don't
> > > seem to respond anymore. That's a shame, because the MMP2 support seems to
> > > in need for some love. The DT/multiplatform kernels can't even boot without
> > > 14/20, 15/20 and perhaps more.
> > > 
> > > I'm wondering if this cat gen in via the arm-soc tree? Would it be
> > > appropriate if I followed up with a MAINTAINERS update in that case?
> > 
> > Yes, sounds good to me. I looked through the series again, and
> > found one patch that seems wrong to me. Everything else should
> > just go in.
> 
> I've applied the DT patches and the ones that touch only arch/arm/mach-*.
> There are a few driver patches here that should be reviewed/acked by the
> corresponding maintainers as well, so I didn't apply most of them yet.

Thank you.

> > > The patch set has been tested on an OLPC XO-1.75 laptop.
> > 
> > Excellent!
> 
> OOooh, I have one of those... somewhere.

I'm working on adjusting the machine's OFW to provide a devicetree that
matches what mainline Linux expects. I'll follow up with a boot script
in a few days -- once it's good enough to be actually useful.

There also seems to be a good chance that we'll get an updated firmware
image at some point.

Until then, CONFIG_ARM_APPENDED_DTB can be used, though a zImage header
needs to be modified to account for the DTB at the end:

https://github.com/hackerspace/olpc-xo175-linux/wiki/How-to-run-an-up-to-date-Linux-on-a-XO-1.75

> -Olof

Lubo