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Linux needs to know what to use as root device. On embedded devices with flash the only common way to specify that is cmdline & root= parameter. That solution works with U-Boot which is Linux & cmdline aware but isn't available with all market bootloaders. Also that method is fragile: 1. Requires specific probing order on multi-flash devices 2. Uses hardcoded partitions indexes A lot of devices use different partitioning methods. It may be "fixed-partitions" or some dynamic partitioning (e.g. based on parts table). For such cases allow "linux,rootfs" property to mark correct flash partition. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20221022211318.32009-1-zajec5@gmail.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.