Create cm4.md

2021-05-20 03:43:46 +08:00 · 2021-05-20 03:43:46 +08:00 · 41f7ac16df
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+#### config.txt add (with I/O board):
+
+```
+avoid_warnings=2
+dtoverlay=dwc2,dr_mode=host
+dtparam=i2c_vc=on
+dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
+eeprom_write_protect=1
+```