[Bug 284042] FTDI: UART breaks JTAG

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 13 Jan 2025 22:42:59 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284042

Tomasz "CeDeROM" CEDRO <tomek@cedro.info> changed:

           What    |Removed                     |Added
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                 CC|                            |tomek@cedro.info

--- Comment #1 from Tomasz "CeDeROM" CEDRO <tomek@cedro.info> ---
* After you connect the dongle are two serial ports showing up (i.e. /dev/cuaU0
and /dev/cuaU1) or only one (i.e. /dev/cuaU0)?
* Are you sure no UART session is active when you start JTAG?
* Have you tried playing with stty [1]? I think the defaults now are hardware
flow control enabled for uarts, what happens if you disable control lines with
stty?
* Maybe you can configure / tune the interface on attach with devd [2]?
* Are you sure there are no buffers / signals on the interface board that could
introduce interference between interfaces A and B of the MPSSE/FTDI?
* Have you tried resetting that interface before a JTAG session?

[1] https://man.freebsd.org/cgi/man.cgi?query=stty
[2] https://man.freebsd.org/cgi/man.cgi?query=devd

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