Hi Nobuhiro You added I2C into the Openblocks AX3-4 device tree and the subnode for the RTC. Did you have any problems with I2C? I'm having lots of problems with my AX3-4 and i2c. I get i2c errors and the bus being locked and then the whole machine locks solid. Gregory, did you test your I2C patches for 370/XP on an Openblocks AX3-4? Thanks Andrew