linux-kernel - Re: [PATCH 00/41] OMAP1 full multiplatform conversion

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Date:   Wed, 20 Apr 2022 22:00:13 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Aaro Koskinen <aaro.koskinen@....fi>
Cc:     linux-omap <linux-omap@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Paul Walmsley <paul@...an.com>,
        Kevin Hilman <khilman@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Mark Brown <broonie@...nel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
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Subject: Re: [PATCH 00/41] OMAP1 full multiplatform conversion

On Wed, Apr 20, 2022 at 7:08 PM Aaro Koskinen <aaro.koskinen@....fi> wrote:
> On Tue, Apr 19, 2022 at 03:36:42PM +0200, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > This is the full series for converting OMAP1 to multiplatform, rebased
> > from my 2019 attempt to do the same thing. The soc tree contains simpler
> > patches to do the same for iop32x, ixp4xx, ep93xx and s3c24xx, which
> > means we are getting closer to completing this for all ARMv5 platforms
> > (I have patches for PXA, which is the last one remaining).
> >
> > Janusz already tested the branch separately and did the missing work
> > for the common-clk conversion after my previous approach was broken.
>
> I tested the full series on the following OMAP1 boards: ams-delta,
> nokia770, osk, palmte and sx1 (QEMU only).
>
> Apart from the earlyprintk breakage, everything seemed to work OK.

Nice, thanks a lot for testing!

> A minor note, zImage grows about 50 KB with a minimal kernel config. This
> is not yet critical, there's still about 7% headroom on 770 to the 2 MB
> bootloader limit on my setup. Also the decompression time is approaching
> the hardcoded watchdog timeout...

I suspect that most of this is for the added devicetree code, and some
more for the common-clk layer. For the omap1_defconfig, there is some
hope to get part of the overhead back eventually by replacing board files
with dts descriptions that are not part of the zImage itself, but it's unlikely
to ever get smaller than it was.

       Arnd