h1. Serial port

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

h2. Settings

|_. Device |_. I/O voltage |_. ID<->GND |_. SOC TX |_. SOC RX |_. switch |_. Comments |
| I9300 | 1.8V[1] | 619 kOhms[3] | D- | D+ | | It gives a shell once Replicant has booted |
| [[NexusSI902xSerial|Nexus S]] | 619K | [[NexusSI902xSerial#Hardware-setup|150 kOhm]] | | | FSA9480 | |
| [[GalaxyNexusI9250SerialConsole|Galaxy Nexus]] | 619 kOhms[4] | | | | | |
| [[OptimusBlackSerial|Optimus Black]] | | N/A[2] | | | DP3T | |

fn1. Measured between USB GND and USB VCC

fn2. Code is required to use the switch as you need to configure both the MUIC and DP3T switch

fn3. See "The related driver source code":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/max77693-muic.c#n102

fn4. See the "postmarketOS wiki page on Serial debugging":https://wiki.postmarketos.org/wiki/Serial_debugging

h2. Interesting links

There is a "page on Serial debugging":https://wiki.postmarketos.org/wiki/Serial_debugging on the postmarketOS wiki that contains information for using the serial port for many smartphones models.