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| author | Luke T. Shumaker <lukeshu@lukeshu.com> | 2025-02-23 10:58:41 -0700 |
|---|---|---|
| committer | Luke T. Shumaker <lukeshu@lukeshu.com> | 2025-02-23 10:58:41 -0700 |
| commit | 53723a43e50863968bb040f5ad4f2f9005bac041 (patch) | |
| tree | 7ffd6ab41a2ecf7754d3db0eded4c31257613a48 /cmd/sbc_harness/static/Documentation/harness_rom_bin.txt | |
| parent | 19a41387633e53d64d8a0ae69f3d3d3e35641c8d (diff) | |
| parent | c2f977be6492fd93b359c97dee9b2968fe56fef6 (diff) | |
Merge branch 'lukeshu/docs'
Diffstat (limited to 'cmd/sbc_harness/static/Documentation/harness_rom_bin.txt')
| -rw-r--r-- | cmd/sbc_harness/static/Documentation/harness_rom_bin.txt | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/cmd/sbc_harness/static/Documentation/harness_rom_bin.txt b/cmd/sbc_harness/static/Documentation/harness_rom_bin.txt new file mode 100644 index 0000000..63fd0a3 --- /dev/null +++ b/cmd/sbc_harness/static/Documentation/harness_rom_bin.txt @@ -0,0 +1,41 @@ +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 |