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managed to boot i.mx8m for the first time using self-built-from-source arm trusted firmware (ATF) and u-boot. neat. to make it work on EVK, lpddr4_switch_to_3200() has to be commented out in ATF. next up: linux kernel + etnaviv

@gaeel totally closed, but now i have an environment where i can do detailled tests on the DDR stuff

@gaeel like, the whole boot software is open except for this DDR PHY training thing.

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