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(parent: 646c3c9) | patch
adi_v5_swd: wait for readable DPIDR, ABORT if stalled 30/5730/7
authorTomas Vanek <vanekt@fbl.cz>
Fri, 1 Mar 2019 20:44:27 +0000 (21:44 +0100)
committerTomas Vanek <vanekt@fbl.cz>
Wed, 2 Dec 2020 23:15:16 +0000 (23:15 +0000)
commitd459a2d27df52643dc8932827a63467a14f7c162
tree6ce5a59a86c700ffefe6bb115549d7fa42abd0datree | snapshot
parent646c3c99020f8fdf7ee0adf821582238aac4a80ccommit | diff
adi_v5_swd: wait for readable DPIDR, ABORT if stalled

Reading of DPIDR is the very first operation after JTAG to SWD sequence.
Without this change if DPIDR read fails then swd connect fails.

Keep trying JTAG to SWD sequence and DPIDR read until success
or timeout 0.5 sec. It makes setting of adapter srst delay on SWD transport
mostly unnecessary.

Also test for ERROR_WAIT (which should not occur according to
IHI 0031E B4.3.2 but a quirk is known) and if bus is kept stalled
then issue abort to make the next connect possible.

Change-Id: Id8fe6618605bbeb4fed5061e987ed55de90a35f2
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/5730
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
src/target/adi_v5_swd.c diff | blob | history
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