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Serial port

There is an in-depth article covering several Samsung devices in the SamsungSerial page

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Device and documentation I/O voltage ID<->GND SOC TX SOC RX switch Comments
I9300 1.8V1 619 kOhms3 D- D+ MAX776935 It gives a shell once Replicant has booted
I9305
Nexus S 150 kOhm FSA9480
Galaxy Nexus 619 kOhms4
Optimus Black N/A2 DP3T

1 Measured between USB GND and USB VCC

2 Code is required to use the switch as you need to configure both the MUIC and DP3T switch

3 See The related driver source code

4 See the postmarketOS wiki page on Serial debugging

5 See the driver and the ifixit teardown

Interesting links

There is a page on Serial debugging on the postmarketOS wiki that contains information for using the serial port for many smartphones models.