Pinebook ProをFreeBSDで動かす(その1：とりあえずブートまで)

参考文献

[1]	. https://scrapbox.io/BSD/NetBSD_on_Pinebook_Pro.
[2]	. https://xosc.org/pinebookpro.html.
[3]	. https://forums.xilinx.com/t5/Embedded-Linux/problem-on-u-boot-quot-Synchronous-Abort-quot-handler-esr/td-p/1060935.
[4]	. https://personalbsd.org/.
[5]	. https://personalbsd.org/images/install-ufs.sh.
[6]	. https://github.com/jsm222/ports/tree/master/sysutils/u-boot-pinebook-pro.
[7]	. https://github.com/TrueFC/ports/tree/master/sysutils/u-boot-pinebook-pro.
[8]	. https://github.com/jsm222/u-boot-pinebookpro.
[9]	. http://build.schmitz.computer/build/FreeBSD-13.0-ALPHA2-arm64-aarch64-ROCKPRO64-pbp-mod2-20210122-02611ef8ee9-256201.img.xz.
[10]	. https://wiki.pine64.org/wiki/Pinebook_Pro#Mainboard_Switches_and_Buttons.