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target: try to reexamine even when polling fails 

After intermittent connection failures or target power failures it
might be necessary to try reexamination even when polling fails. This
should make communication with Cortex-A targets more reliable.

This was runtime tested with stlink attached to an stm32l1 and an FTDI JTAG
adapter attached to an stm32f1 target.

Change-Id: I38c4db8124b7f4bbf53ddda53c13273449f49c15
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2721
Tested-by: jenkins
Reviewed-by: Felipe Balbi <balbi@ti.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Paul Fertser 2015-04-17 13:36:28 +03:00
parent 0d50dfe318
commit f7f9a37fa6
1 changed files with 4 additions and 6 deletions
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10
src/target/target.c
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@ -2522,29 +2522,27 @@ static int handle_target(void *priv)
target->backoff.times *= 2;
target->backoff.times++;
}
LOG_USER("Polling target %s failed, GDB will be halted. Polling again in %dms",
target_name(target),
target->backoff.times * polling_interval);
/* Tell GDB to halt the debugger. This allows the user to
* run monitor commands to handle the situation.
*/
target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
return retval;
}
/* Since we succeeded, we reset backoff count */
if (target->backoff.times > 0) {
LOG_USER("Polling target %s succeeded again, trying to reexamine", target_name(target));
LOG_USER("Polling target %s failed, trying to reexamine", target_name(target));
target_reset_examined(target);
retval = target_examine_one(target);
/* Target examination could have failed due to unstable connection,
* but we set the examined flag anyway to repoll it later */
if (retval != ERROR_OK) {
target->examined = true;
LOG_USER("Examination failed, GDB will be halted. Polling again in %dms",
target->backoff.times * polling_interval);
return retval;
}
}
/* Since we succeeded, we reset backoff count */
target->backoff.times = 0;
}
}