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NAME
/harness/rom.bin
DESCRIPTION
Read access to the RP2040 CPU's ROM. This contains code that
initializes the chip to load the main firmware from the
external flash chip, provides a failsafe USB-programmable
mode, and provides a few functions that the main firmware can
call to.
BUGS
This ROM is programmed into the chip at the factory; revising
it means issuing a new revison of the RP2040 CPU. So while
the source code to the ROM is freely available to be used,
studied, and shared; one cannot install modified versions onto
the CPU.
HISTORY
- RP2040 B0 : chips manufactured before September 2020 or so
- RP2040 B1 : chips manufactured after September 2020 or so
- Released to the public January 2021; chance whether you get
a B0 or a B1 chip.
- RP2040 B2 : released September 2021
Printed on the physical CPU is a label that indicates which
revision it is. For example:
RP2-B2 21/24
indicates that it is the "B2" revision (and was manufactured
the 21st week (late May) of 2024).
SEE ALSO
- /harness/cpuinfo.txt can report which CPU version you have.
- The source code to each ROM revision is published at
https://github.com/raspberrypi/pico-bootrom-rp2040
AUTHOR
Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
SPDX-License-Identifier: AGPL-3.0-or-later
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