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Can I used the denx 5.5.3 ELDK to build and debug mainline u-boot image for the Pi Zero Plus2 H5, do I need 5.6, or is there another version somewhere for the 64-bit arches, that deals with the arch switch? 
Anyone have a quick recipe so I can debug u-boot on this device and try see/fix where the HDMI init is failing? 
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