linux-kernel - Re: [PATCH v3 03/10] partitions: Introduce NVIDIA Tegra Partition Table

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Message-ID: <20200323213520.GA16587@qmqm.qmqm.pl>
Date:   Mon, 23 Mar 2020 22:35:20 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Nicolas Chauvet <kwizart@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Billy Laws <blaws05@...il.com>, linux-tegra@...r.kernel.org,
        linux-block@...r.kernel.org, Andrey Danin <danindrey@...l.ru>,
        Gilles Grandou <gilles@...ndou.net>,
        Ryan Grachek <ryan@...ted.us>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 03/10] partitions: Introduce NVIDIA Tegra Partition
 Table

On Mon, Mar 23, 2020 at 10:59:52PM +0300, Dmitry Osipenko wrote:
> 23.03.2020 22:17, Michał Mirosław пишет:
> > On Mon, Mar 23, 2020 at 07:34:24PM +0300, Dmitry Osipenko wrote:
> >> All NVIDIA Tegra devices use a special partition table format for the
> >> internal storage partitioning. Most of Tegra devices have GPT partition
> >> in addition to TegraPT, but some older Android consumer-grade devices do
> >> not or GPT is placed in a wrong sector, and thus, the TegraPT is needed
> >> in order to support these devices properly in the upstream kernel. This
> >> patch adds support for NVIDIA Tegra Partition Table format that is used
> >> at least by all NVIDIA Tegra20 and Tegra30 devices.
> >>
> >> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> >> ---
> >>  arch/arm/mach-tegra/tegra.c   |  54 ++++
> > [...]
> > 
> > Please split off this part and make the information available to
> > userspace (pt_addr + pt_size) if found. This would make it easier
> > to support use the partition table later in initrd instead.
> 
> Please clarify what do you mean by "use the partition table later in
> initrd instead".

Configure device-mapper to span eMMC boot+data partitions and then ask
(modified) kpartx to partition the resulting device. All before rootfs
is mounted and switched to in initrd.

Best Regards
Michał Mirosław