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>
# Read section 6.3 in http://www.ti.com/lit/pdf/swru319 for more information.
proc ti_cjtag_to_4pin_jtag {jrc} {
# Bypass
+ runtest 20
irscan $jrc 0x3f -endstate RUN/IDLE
# Two zero bit scans and a one bit drshift
pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
Linking to existing account procedure
If you already have an account and want to add another login method
you
MUST first sign in with your existing account and
then change URL to read
https://review.openocd.org/login/?link
to get to this page again but this time it'll work for linking. Thank you.
SSH host keys fingerprints
1024 SHA256:YKx8b7u5ZWdcbp7/4AeXNaqElP49m6QrwfXaqQGJAOk gerrit-code-review@openocd.zylin.com (DSA)
384 SHA256:jHIbSQa4REvwCFG4cq5LBlBLxmxSqelQPem/EXIrxjk gerrit-code-review@openocd.org (ECDSA)
521 SHA256:UAOPYkU9Fjtcao0Ul/Rrlnj/OsQvt+pgdYSZ4jOYdgs gerrit-code-review@openocd.org (ECDSA)
256 SHA256:A13M5QlnozFOvTllybRZH6vm7iSt0XLxbA48yfc2yfY gerrit-code-review@openocd.org (ECDSA)
256 SHA256:spYMBqEYoAOtK7yZBrcwE8ZpYt6b68Cfh9yEVetvbXg gerrit-code-review@openocd.org (ED25519)
+--[ED25519 256]--+
|=.. |
|+o.. . |
|*.o . . |
|+B . . . |
|Bo. = o S |
|Oo.+ + = |
|oB=.* = . o |
| =+=.+ + E |
|. .=o . o |
+----[SHA256]-----+
2048 SHA256:0Onrb7/PHjpo6iVZ7xQX2riKN83FJ3KGU0TvI0TaFG4 gerrit-code-review@openocd.zylin.com (RSA)
Code Review / openocd.git / commitdiff