The Undocumented Pi

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Resources:

Hardware & Peripherals:

Hardware and Hardware History.

Low-level Peripherals and Expansion Boards.

Screens, Cases and Other Peripherals.

Software & OS Distributions:

Software and Distributions

Documentation:

Documentation Page

The Undocumented Pi

Hardware

SoC

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.

BCM2711

The BCM2711 does not have PLLH.

PMIC

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.

Boot ROM

Firmware

Abbreviations

CM
Clock Manager
HSM
HDMI State Machine
OTP
One-Time Programmable (memory)