The Undocumented Pi
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Hardware & Peripherals:
Software & OS Distributions:
There is a nicely ordered table with all BCM2835_registers as found in the GPU code published by Broadcom. Unfortunately, the table does not quite match the SoC in the Raspberry Pi, but it's a good start. The sections below should serve as a companion to that table.
The BCM2711 does not have PLLH.
Recent boards contain a MaxLinear XR77004, which looks like a stripped down version of MxL7704 (datasheet). It is on the system I²C bus (I2C8 on RPi4, I2C0 on all other devices) at address 0x1d. No documentation is available.
- Clock Manager
- HDMI State Machine
- One-Time Programmable (memory)