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

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>

diff --git a/package/mender/Config.in b/package/mender/Config.in
index 6a80c410ce4187b19e2828ec44327c9ebb878fe4..accee4676a5cf7db2d3336c4aeeecea640ada19f 100644 (file)
--- a/package/mender/Config.in
+++ b/package/mender/Config.in
@@ -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"