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Integrate uboot-imx-kuk/add_boot_bus_check

GitBot requested to merge integrate/uboot-imx-kuk/add_boot_bus_check/into/kirkstone into kirkstone

Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@c432389c

Removed rearrangement of the USDHC busses

The USDHC busses had been rearranged, because we have a different pin mapping on the MC3 (as compared to the Trizeps modules and the DE). We now have a boot bus detection, which sets the correct bus for the boot scripts. This makes the rearrangement obsolete. Removing the rearrangement also fixes an error in the save function for the environment, which mixes the boot bus with the device tree definitions.

BCS 746-000814

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@fb5fcbc7

cmd:guf: Added boot bus detection to guf sub-system

The boot bus detection sets an environment variable that contains the USDHC bus, from which U-Boot was started. The variable is used in the search for the boot scripts and prevents U-Boot from mixing up the eMMC and SD-Card.

BCS 746-000814

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