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fastboot: Support defining raw partitions without a partition table

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Add support for defining raw fastboot partitions in eMMC by specifying
the offset and size in an environment variable. Optionally, the eMMC
hardware partition number may also be specified.

This makes it possible to e.g. update only part of the eMMC boot
partition, instead of having to write the entire partition.

Signed-off-by: Filip Brozovic <fbrozovic@gmail.com>
This commit is contained in:
Filip Brozovic
2020-06-29 13:14:37 +02:00
committed by Marek Vasut
parent 1468a1cc72
commit a17c0cb85e
2 changed files with 85 additions and 9 deletions
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19
doc/android/fastboot.rst
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@@ -85,6 +85,25 @@ for example::
fastboot_partition_alias_boot=LNX
Raw partition descriptors
^^^^^^^^^^^^^^^^^^^^^^^^^
In cases where no partition table is present, a raw partition descriptor can be
defined, specifying the offset, size, and optionally the MMC hardware partition
number for a given partition name.
This is useful when using fastboot to flash files (e.g. SPL or U-Boot) to a
specific offset in the eMMC boot partition, without having to update the entire
boot partition.
To define a raw partition descriptor, add an environment variable similar to::
fastboot_raw_partition_<raw partition name>=<offset> <size> [mmcpart <num>]
for example::
fastboot_raw_partition_boot=0x100 0x1f00 mmcpart 1
Variable overrides
^^^^^^^^^^^^^^^^^^