The LS1021a Core 0 is enabled using the RCW[BOOT_HO] bit.
The LS1021a Core 0 uses software for setting the Boot Location Pointer for core 1 via the SCRATCHRW1 register and enabling Core 1 using the DCFG_CCSR_BRR register.
See the following pages:
https://lists.denx.de/pipermail/u-boot/2014-November/196577.html
or
https://gitlab.labs.nic.cz/turris/u-boot-turris/blob/b724bd7d63498449d3960bbd3075ba94d7152890/arch/a...
Have a great day,
Pavel Chubakov
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