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jtag: enable connect under reset 

Currently if the target supports srst_nogate we wait until target assert_reset
until we get a chance to assert the srst.
However sometimes we will not get this far if the target has already failed
the jtag_examine_chain.

This has been tested on targets that support this behaviour (STM32 and STR9).

Change-Id: Ibcf7584b137b472f31ba6ddd5cd99d848c5508d1
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/971
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
This commit is contained in:
Spencer Oliver 2012-11-13 12:02:26 +00:00 committed by Freddie Chopin
parent c91dbd41ba
commit 67a848424b
1 changed files with 19 additions and 1 deletions
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20
src/jtag/core.c
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@ -1549,7 +1549,17 @@ int jtag_init_reset(struct command_context *cmd_ctx)
if ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0)
jtag_add_reset(0, 1);
}
jtag_add_reset(0, 0);
/* some targets enable us to connect with srst asserted */
if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
if (jtag_reset_config & RESET_SRST_NO_GATING)
jtag_add_reset(0, 1);
else {
LOG_WARNING("\'srst_nogate\' reset_config option is required");
jtag_add_reset(0, 0);
}
} else
jtag_add_reset(0, 0);
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
@ -1572,6 +1582,14 @@ int jtag_init(struct command_context *cmd_ctx)
/* guard against oddball hardware: force resets to be inactive */
jtag_add_reset(0, 0);
/* some targets enable us to connect with srst asserted */
if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
if (jtag_reset_config & RESET_SRST_NO_GATING)
jtag_add_reset(0, 1);
else
LOG_WARNING("\'srst_nogate\' reset_config option is required");
}
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;