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Denis 'GNUtoo' Carikli, 12/13/2019 05:03 PM
I think that Serial port refers to the PC standard. UART allows more diverse voltage. Not 100% sure though.
UART¶
There is an in-depth article covering several Samsung devices in the SamsungSerial page
Settings¶
| Device and documentation | I/O voltage | ID<->GND | SOC TX | SOC RX | switch | stock bootloader settings | Comments |
|---|---|---|---|---|---|---|---|
| I9300 | 1.8V1 | 619 kOhms3 | D- | D+ | MAX776935 | * speed: 115200 * pressing the volume-down button during boot increase verbosity |
It gives a shell once Replicant 6 has booted |
| I9305 | |||||||
| N7100 | ? | ||||||
| N7105 | ? | ||||||
| Galaxy Nexus | 619 kOhms4 | ||||||
| Nexus S | 150 kOhm | FSA9480 | |||||
| Optimus Black | 1.8V6 | 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
6 Reference: OptimusBlackSerial
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.
- mv-uart A serial port adapter with configurable voltages (and GPIOs)
Updated by Denis 'GNUtoo' Carikli almost 5 years ago · 40 revisions