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https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO/open-source-hardware
A20版本开发板原理图: A20-OLINUXINO-MICRO_Rev_M.pdf
A20 已自带了VGA外设了
https://github.com/u-boot/u-boot/blob/master/configs/A20-OLinuXino_MICRO_defconfig
https://github.com/u-boot/u-boot/blob/master/arch/arm/dts/sun7i-a20-olinuxino-micro.dts
https://github.com/u-boot/u-boot/blob/master/arch/arm/dts/sun7i-a20-olinuxino-lime2.dts
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