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(parent: d8c9f66) | patch
target/ti-cjtag: make switching to JTAG more reliable 19/7419/3
authorLorenz Brun <lorenz@brun.one>
Sat, 24 Dec 2022 02:56:22 +0000 (03:56 +0100)
committerAntonio Borneo <borneo.antonio@gmail.com>
Sat, 10 Jun 2023 17:11:46 +0000 (17:11 +0000)
commit63f4e7c72a27fb828fe1be3003be6a94519e1c12
treea975fad6a1b3d70a28a61ec16ee5d7ec96a7d668tree | snapshot
parentd8c9f66d25cde09570e4f87e354216470b72de7ecommit | diff
target/ti-cjtag: make switching to JTAG more reliable

The current cJTAG to JTAG switching commands for TI chips are not
particularly reliable, especially on chips with accurate timing.
On a Raspberry Pi the existing sequence has (depending on cabling and
chip) a ~50% chance of working, on a much better-behaved FT2232H
it doesn't manage to enable full JTAG at all.

This change runs a bunch of test-idle cycles before actually attempting
to switch to full JTAG. This makes the switch reliable even at high
clock speeds (>100kHz) and from precise sources like the FT2232H.

Change-Id: I9293e884bf3e9606d529756ae4483b844d3c39db
Reported-by: Phil Wiggum <p1mail2015@mail.com>
Fixes: https://sourceforge.net/p/openocd/tickets/375/
Signed-off-by: Lorenz Brun <lorenz@brun.one>
Reviewed-on: https://review.openocd.org/c/openocd/+/7419
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
tcl/target/ti-cjtag.cfg diff | blob | history
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