TS-7840 I2C

This system includes 3 I2C busses.

The first bus is used for the RTC, onboard supervisory microcontroller, and connects to the FPGA.

/dev/i2c-0

Address	Device
0x54	Onboard Supervisory microcontroller
0x68	ST M41T00S RTC

The second bus is used for the security chipset, and the Mikrobus socket

/dev/i2c-1

Address	Device
0x64	ATSHA204 Security chipset

The third bus is for the SFP port (K3_A) on the right of the enclosure.

/dev/i2c-3

Address	Device
0x50	SFP "eeprom" module

The fourth bus is for the second SFP port (K2_A) on the left edge of the enclosure.

/dev/i2c-4

Address	Device
0x50	SFP "eeprom" module