Hello. I want to create an image for this Board: Allwinner R528-S3.  You can find info about it here.  From the docs:  It integrates the high-performance dual-core Cortex-A7 and single-core HiFi4 DSP 128 MB DDR3 CPU Architecture  Dual-core ARM Cortex-A7  32 KB L1 I-cache + 32 KB L1 D-cache per core, 256 KB L2 cache I just want to know where to start. Where do I start creating a config for this CPU and all that? I already have some info about the device and memory and all tha