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Home > The Amp Hour Electronics Podcast > #463 – An Interview with Trammell Hudson


	Podcast:		The Amp Hour Electronics Podcast
	Episode:		#463 – An Interview with Trammell Hudson
	Category:		Science & Medicine
	Duration:		01:13:08
	Publish Date:		2019-10-20 19:32:51
	Description:		Welcome Trammell Hudson! This episode is sponsored by Rohde and Schwarz. Check out AskAnEngineer.us for more info about their value line test equipment. Trammell likes to gets things to the Proof of Concept stage, and then “hand off the keys to the repo” Matthew Garrett quote, (paraphrased) “I don’t think I’m very good with computers, I’m just bad at knowing when to give up” Taking good notes is a big part of Trammell’s process, which resulted in the site linked above. Magic lantern firmware Started from CHDK firmware, which is GPL Starts with looking at the updates that the vendors ship, then getting code execution Toggling the firmware out on an LED Disassembler tools: Hopper Ida Ghidra He’s currently playing with Ikea smart bulbs and dimmers Gave a talk at Hack in the Box about “time of check, time of use” Project called Linuxboot, replaces x86 firmware with linux software Trammell’s newest project is the SpiSpy Logs all the flash memory accesses Tool was built to speed up firmware dev that revealed security hole Built with the ECP5 Gave a talk about SpiSpy at CCCamp Hard to emulate the real time flash, since you have to serve up a response in 1 clock cycle DRAM is too slow, so it’s necessary to start the row/column reads before they have all of the bits Retrocomputing PDP11 Mac SE Former guest of TAH Fabienne did the ROM dump scarves Archive.org documents old file formats Teensy4 Scanlime had a tiny85 act like an RFID Trammell replicated and extended this work RFID doesn’t transmit back from the passive device side, it just shorts the coils together PSK31 13 hz of bandwidth SpiSpy project had a bus contention problem, scope saved the day Vector stuff Used dual DAC to drive the XY Former guest Todd Bailey also did vector work on the VEC9 CRTs don’t move instantaneously Vector generation needs to model the magnetic drivers Added tunable parameters to the screen driver code. Later CRTs had color Had a write up in POC \| GTFO Worked on Robots with others at NYC Resistor Puma Robot Arms were reverse engineered and turned into shuffleboard robots Using a scope for the quadrature decoding Trammell is a full time Security Researcher Thunderstrike was a vulnerability that allowed code insertion via the thunderbolt cable on the mac. Linuxboot replace proprietary boot software in servers and other hardware with linux Independent bios vendor Bulk of the code comes from intel Unix wars of 80s and 90s OEMs do “not invented here” Gave a talk about it at 34c3 Build your own custom firmware for the lamps Check out all of Trammell’s projects on trmm.net Find Trammell as @qrs on Twitter or Mastadon The image is a capture from a 1 kilopixel Cyclops sensor that Trammell re-projected through an oscilloscope (link)
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