01-12-2018, 03:26 PM
The first stage loader is part of the SoC (BROM) and is fixed, the SPL (second stage loader) and u-boot are on your boot medium, you can replace those with whatever you want. If you don't use u-boot's SPL and the ARM trusted platform firmware you have to do the whole initialization of DRAM, CPU cores and power management yourself. Have you looked at the A64 user manual and read up on the low level boot process? https://github.com/apritzel/pine64/blob/...Booting.md
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