uart0-helloworld-sdboot: allow flexible GPIO/UART0 base address
Allwinner A80 and H6 SoC has totally different memory map with other Allwinner SoCs, and so the GPIO/UART0 base addresses are different on these SoCs. Use a static variable to store the base address, to fit these SoCs with different memory map. Signed-off-by: Icenowy Zheng <icenowy@aosc.io> Signed-off-by: Andre Przywara <osp@andrep.de>
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