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package/mender: do not automatically select uboot tools if uboot is selected

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Because uboot requires a set of unique patches for each board, the
upstream package developers are phasing out supporting uboot wherever
possible.  Instead, they recommend using Grub2 as a secondary
bootloader and using the mender-grubenv package.

Because the mender-grubenv file provides it's own fw_printenv script,
it is not possible to know if U-Boot's fw_printenv or mender-grubenv's
fw_printenv should be used.

As such, remove selecting uboot tools when uboot is selected, and
instead add a more comprehensive note in the help section about what
Mender requires for uboot and grub2-based systems, with a link to the
meta-mender github project for the base uboot patches, and a link to
the official documentation on manual uboot integration.

Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Adam Duskett 2021-03-15 10:31:06 -07:00 committed by Thomas Petazzoni
parent 3ca79b8d18
commit 136f317c68
1 changed files with 22 additions and 2 deletions

24
package/mender/Config.in
View File

@ -5,14 +5,34 @@ config BR2_PACKAGE_MENDER
depends on BR2_TOOLCHAIN_HAS_THREADS
select BR2_PACKAGE_OPENSSL
select BR2_PACKAGE_XZ
select BR2_PACKAGE_UBOOT_TOOLS if BR2_TARGET_UBOOT # runtime
select BR2_PACKAGE_UBOOT_TOOLS_FWPRINTENV if BR2_TARGET_UBOOT # runtime
help
Mender is an open source over-the-air (OTA) software updater
for embedded Linux devices. Mender comprises a client
running at the embedded device, as well as a server that
manages deployments across many devices.
Notes:
For systems using uboot as the bootloader:
- uboot must have the mender uboot patches applied.
- uboot-tools must be selected.
- fw_printenv must be functional on the device.
The Mender Uboot patches are at:
https://github.com/mendersoftware/meta-mender/
For more information on Manual U-Boot integration, see:
https://docs.mender.io/2.6/system-updates-yocto-project/board-integration/bootloader-support/u-boot/manual-u-boot-integration
For systems using Grub2 as the bootloader:
- Mender depends on the mender-grubenv package.
- The mender-grubenv package provides a fw_printenv script,
which is not compatible with the uboot-tools fw_printenv
script.
The mender project recommends using uboot to load Grub2 as a
secondary bootloader whenever possible. Using Grub2 as a
secondary bootloader prevents users from porting the patches
for uboot to each new device.
https://github.com/mendersoftware/mender
comment "mender needs a toolchain w/ threads"