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mmc: Update environment variable with active partition

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This patch allows uboot scripts make choices about where to boot from based
on the active mmc boot partition. This allows having two copies of kernel,
filesystems etc, and choosing which to boot from based off of the active
bootloader partition.

Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Reuben Dowle
2021-05-14 10:15:43 +12:00
committed by Peng Fan
parent 1925e65706
commit 5c2beda545
2 changed files with 12 additions and 6 deletions
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4
doc/usage/mmc.rst
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@@ -19,7 +19,7 @@ Synopsis
mmc wp
mmc bootbus <dev> <boot_bus_width> <reset_boot_bus_width> <boot_mode>
mmc bootpart-resize <dev> <dev part size MB> <RPMB part size MB>
mmc partconf <dev> [boot_ack boot_partition partition_access]
mmc partconf <dev> [[varname] | [<boot_ack> <boot_partition> <partition_access>]]
mmc rst-function <dev> <value>
Description
@@ -92,6 +92,8 @@ The 'mmc bootbus' command sets the BOOT_BUS_WIDTH field. (*Refer to eMMC specifi
The 'mmc partconf' command shows or changes PARTITION_CONFIG field.
varname
When showing the PARTITION_CONFIG, an optional environment variable to store the current boot_partition value into.
boot_ack
boot acknowledge value
boot_partition