bl2 bl30 bl31 are provided as binary in u-boot git repo.
Is the source code available?
NO, they are provided by Amlogic, only they have the source code.
There’s been an interesting discussion around the topic in other thread. You may want to read it: S912 limited to 1200 MHz with multithreaded loads
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More specifically, this post and the following talk about the possibility of an open source version of those binaries: S912 limited to 1200 MHz with multithreaded loads
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or is there source of BL1, or user manual of kvim2 for ddr dmc, phy set up?