osmjs
libosmpbf-dev C++
	/usr/lib/libosmpbf.a
	/usr/include/osmpbf
	/usr/include/osmpbf/osmformat.pb.h
	/usr/include/osmpbf/fileformat.pb.h
	/usr/include/osmpbf/osmpbf.h
libosmium-dev - C++ framework for working with OSM data files
libreadosm1 (C)
layout:
	pullups on
		MISO at the driver (10..100 kΩ)
		MOSI at the driver (?)
		CS at the driver (?)
		SCK default depends on SPI mode. For mode 3, pull up SCK.
		(SPI is totem-pole driven system unlike I2C)
		Not required if pins are in pushpull mode.
		Required if the pins are in open drain mode.
		I2C is pulled up at the host's UEXT on A20
	clock:
		X24MO Clock Output of 24 MHz Crystal (N22, N23; quartz crystal Q3)
		X32KO Clock Output of 32768 Hz Crystal
Faraday cage:
	isolate high-clock things, these are:
		A20
		MCP2551
		maybe TSS463AA
	ground it.
sun4i-codec:
	Fm output Volume, DAC ACTL:
		FM Input to output mixer Gain Control
		from -4.5 db to 6 db, 1.5 db/step, default is 0 db.
		-4.5 db: 0
		-3.0 db: 1
		...
		6 db: 7
CPU temperature readout
	cat /sys/devices/virtual/thermal/thermal_zone0/temp
	Part of Touchscreen Controller
	CONFIG_THERMAL=y and CONFIG_CPU_THERMAL=y.
sun4i_can
sun4i-ss
sun4i-lradc-keys
sun4i-ps2
rtc-sunxi
pwm-sun4i
Integrate sun4i-codec patches upstream.
TDA7313??
MICIN1:
	100 nF in series, but 3.3 nF to ground as close as possible to mic socket.