Re: Black box flight recorder for Linux

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Krzysztof Halasa wrote:


I think the most trivial and reliable way would be to solder some
I^2 or similar EEPROM chip to, for example, parallel port connector.

Most motherboards have an internal I^2C bus / SMBus (for reading RAM
types and for other things) and I think it could be used to connect
the EEPROM instead of external port.

There are 512 Kbit (64 KB) and 1 Mbit (128 KB) EEPROMs available -
there is plenty of space not only for crash dump but for whole dmesg.
Just an additional thought on this idea... both VGA and DVI connectors on modern video cards appear to have DDC-2 connections, which is in fact I2C. This would provide an (inherently bidirectional :-) ) 3-pin digital interface out of a mostly dead box even on laptops and so on with no serial, parallel or legacy keyboard/mouse, so long as they had reasonably modern VGA or DVI out. You would need to get access to the two I2C pins and Gnd somehow in that scenario. Since I2C has a concept of addressing it should be possible to choose I2C addresses for this communication that doesn't address whatever may be listening on the same bus in the monitor.
I don't know if you bitbang these or there is some kind of shifter/management logic in the video chip, in which case some minimal case by case support is needed, but since simple IO is otherwise all but gone on modern laptops so I thought it worth mentioning. 

-Andy

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