customizations.md

uCM4 customizations

Following items can be changed without redesigning the board

No microSD slot

microSD slot has been designed to be optional feature. For this purpose 0 Ohm resistors are placed on data lines as close to Hirose connector, as was possible. Following items should not be fitted in this case:

1. TF-015 microSD slot
2. R6-R11 0 Ohm resistors
3. RT9742CGJ5F chip marked as U1
4. R5 resistor between SD_PWR_ON and SD_EN

Writable EEPROM

By default CM4 EEPROM has been locked, meaning it cannot be written to. This lock can be lifted by removing R3 0 Ohm resistor.

Power and reset buttons

These buttons can be either fitted, or not, depending on user preference.

UART header

Same as with buttons. Can be skipped, depending on preference.