> The existing doc for "ft2232_layout evb_lm3s811" is unclear
> and/or misleading ... can someone clarify?
>
> Board docs say it supports JTAG in two modes.
>
> - The one documented for OpenOCD is "pass through" ... the
> EVM operates as a $49 (sez DigiKey) JTAG adapter without
> TRST, SRST, or some other goodies.
>
> - The one which is the main point of the board: nothing on
> the 20-pin connector, so the ft2232 is used to debug the
> Stellaris chip (Cortex M3 based).
>
> My two questions: (a) are the current OpenOCD docs correct
> to say that only the passthrough mode works?? (b) did the
> engineers at Luminary ("now TI") do the sane thing and make
> all their other EVBs use the same ft2232 layout ... is it for
> some reason unique to this board?
>
The name evb_lm3s811 is probably a little confusing.
Luminary seem to use the same interface for all their dev boards, the
name should probably be something more generic.
The luminary eval boards as you say support two modes, three modes on the
newer ones.
1. connected to the onboard luminary target
2. connected to a offboard target using the 20way jtag header.
3. connect an external jtag tool to the onboard target, eg. jlink.
All the openocd testing (cfg files) has been with the onboard luminary
target (1) and not passthrough.
So the docs are incorrect in my opinion.
Personally i have not tested the passthrough interface, mainly because there
is no trst, srst - so it is
simpler to connect an amontec dongle for example.
Cheers
Spen
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