Case study

Macrosilicon Custom Firmware: rebuilding USB video chip EEPROM firmware

Macrosilicon Custom Firmware studies the 8051 mask ROM and EEPROM loading behavior of MS2107, MS2109 and MS9123 USB video chips, then builds replacement EEPROM images. Its chip notes map hooks, headers and memory addresses; host tools dump device memory and access new HID mailbox commands for status, GPIO and I2C.

Targets: Firmware
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-08

Stars: 16
Last commit: 2026-10-13
Language: Python

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: A supported MS2107, MS2109 or MS9123 device; build instructions use SDCC tooling.
Testing evidence: The MS2109 D7 mailbox has been tested from RAM, but its flashed image has not been run on hardware.
License: No licence file in the repository.

Cite

BibTeX

@misc{macrosilicon-custom-firmware-case,
  title = {{Macrosilicon Custom Firmware: rebuilding USB video chip EEPROM firmware}},
  howpublished = {\url{https://github.com/kraln/macrosilicon_firmware}},
  url = {https://github.com/kraln/macrosilicon_firmware},
  urldate = {2026-11-08},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/macrosilicon-custom-firmware-case/}}
}

Plain text

Macrosilicon Custom Firmware: rebuilding USB video chip EEPROM firmware. https://github.com/kraln/macrosilicon_firmware (accessed 2026-11-08). Awesome REA entry: https://awesomerea.org/resources/macrosilicon-custom-firmware-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · kraln/macrosilicon_firmware · Revision caa3d27
ms2109/rom/d7_rom_notes.md GitHub · kraln/macrosilicon_firmware · Revision caa3d27
docs/macrosilicon-notes.md GitHub · kraln/macrosilicon_firmware · Revision caa3d27