upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
u-boot/drivers/cpu/Kconfig

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config CPU
bool "Enable CPU drivers using Driver Model"
help
This allows drivers to be provided for CPUs and their type to be
specified in the board's device tree. For boards which support
multiple CPUs, then normally have to be set up in U-Boot so that
they can work correctly in the OS. This provides a framework for
finding out information about available CPUs and making changes.