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Mar 25, 2013, 01:25 AM
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intermediate memory bootloaders


Intermediate memory bootloaders (16 min 29 sec)


Mike had a useful nugget on the intermediate memory bootloader. The bootloader hasn't gotten much attention between all the other issues, but an easier way to update firmware would go a long way. The problem is there's no dominant communication method. Wifi interferes with too many sensors. USB is only used on the ground stations. The flight protocol would take 100 seconds.

Don't remember any intermediate memory bootloaders before 2009. The dominant embedded system was the camera. It was a 1 step process where the mane program flashed itself while telling you not to turn the power off. Only when smartphones appeared did the 2 step concept of downloading to scratch memory & rebooting to flash it become the normal routine. Requiring users to reboot got a bad reputation from Windows, but now they've gotten used to it.


Optical flow odometry is pure hell. Technologies are born & die over real short timescales. You can tell when particular technologies peaked by the dates on the goog searches. For brushless gimbals, all the pages are in the last 4 months, so it's the current big thing. For optical flow odometry, the pages concentrate near 2005, then it sporadically bubbles up after 2009.

Optical flow odometry seems to come & go as key improvements in microprocessors & cameras appear, people take up the issue again & drop it. It has a real problem navigating outside the 1 specific altitude it's tuned for.

Helicommand will always be the product that got it on the radar. Those were everywhere in 2007, but after the uBlox 5 came out, everyone switched to GPS.
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