n-hass / bcm2711-otp-linux

Linux kernel module for reading / writing to the Broadcom BCM2711 OTP registers

Adapted from the work from liberpi's fork of LittleKernel.

Change Makefile /lib reference if you are not building on NixOS.

Interface

Uses a sysfs interface at /sys/devices/platform/otp/interface.

Two files:

• in: write a command
• out: read output

Commands are in the format: r/w row_num [new_value]

• r for read, w for write
• row_num for the OTP register number to operate on
• [new value], optional, to be supplied when writing (in hexadecimal)

For example, to read the value of register 37:

echo 'r 37' > /sys/devices/platform/otp/interface/in
cat /sys/devices/platform/otp/interface/out

All input/output format is in hexadecimal