From: Christoph Hellwig <hch@infradead.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: "Jens Axboe" <axboe@kernel.dk>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Colin Cross" <ccross@android.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"David Heidelberg" <david@ixit.cz>,
"Peter Geis" <pgwipeout@gmail.com>,
linux-efi@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-block@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] partitions/efi: Add 'gpt_sector' kernel cmdline parameter
Date: Wed, 19 Feb 2020 08:27:38 -0800 [thread overview]
Message-ID: <20200219162738.GA10644@infradead.org> (raw)
In-Reply-To: <20200219162339.16192-1-digetx@gmail.com>
On Wed, Feb 19, 2020 at 07:23:39PM +0300, Dmitry Osipenko wrote:
> The gpt_sector=<sector> causes the GPT partition search to look at the
> specified sector for a valid GPT header if the GPT is not found at the
> beginning or the end of block device.
>
> In particular this is needed for NVIDIA Tegra consumer-grade Android
> devices in order to make them usable with the upstream kernel because
> these devices use a proprietary / closed-source partition table format
> for the EMMC and it's impossible to change the partition's format. Luckily
> there is a GPT table in addition to the proprietary table, which is placed
> in uncommon location of the EMMC storage and bootloader passes the
> location to kernel using "gpt gpt_sector=<sector>" cmdline parameters.
>
> This patch is based on the original work done by Colin Cross for the
> downstream Android kernel.
I don't think a magic command line is the way to go. The best would be
to reverse-engineer the proprietary partition table format. If that is
too hard we can at least key off the odd GPT location based of it's
magic number.
next prev parent reply other threads:[~2020-02-19 16:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-19 16:23 [PATCH v1] partitions/efi: Add 'gpt_sector' kernel cmdline parameter Dmitry Osipenko
2020-02-19 16:26 ` Ard Biesheuvel
2020-02-19 16:36 ` Dmitry Osipenko
2020-02-19 16:27 ` Christoph Hellwig [this message]
2020-02-19 16:38 ` Dmitry Osipenko
2020-02-19 16:59 ` Stephen Warren
2020-02-19 17:44 ` Dmitry Osipenko
2020-02-24 16:33 ` Karel Zak
2020-02-24 17:23 ` Dmitry Osipenko
2020-02-24 18:22 ` Dmitry Osipenko
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