All of a sudden /var/log on my NanoPi NEO is filling up with a constant stream of “twi_start()434 - [i2c0] START can’t sendout!” It’s filling kern.log, messages, and syslog at fast rate.
Google shows it may have something to do with 12c0 but I haven’t touched that. 
Any fresh ideas?
Thanks!!
UPDATE
OK, I restored my last good backup which rolled me back to v1.50
I then updated to v1.51 and checked the logs again. I’m still “twi_start()434 - [i2c0] START can’t sendout!” messages, but less than 100 or so 
early in boot process.
There’s two occurrences and then they seem to be gone after that.
The first starts following:
kernel: [ 1.321329] i2c /dev entries driver
kernel: [ 1.322404] sunxi cedar version 0.1
kernel: [ 1.322494] [cedar]: install start!!!
kernel: [ 1.322878] [cedar]: install end!!!
kernel: [ 1.323216] twi_start()434 - [i2c0] START can’t sendout!
One difference I noticed was the [i2c0] section now increments every 25~27 or so messages; [i2c0], [i2c1], [i2c2].
The last occurrences, totalling only 9, follows:
kernel: [ 6.739784] g_serial gadget: Gadget Serial v2.4
kernel: [ 6.739817] g_serial gadget: g_serial ready
kernel: [ 9.620838] twi_start()434 - [i2c0] START can’t sendout!
Anyway, it’s up and it’s stable.
Anyone have any idea what this is?