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cortex-m3: support connecting under reset 

Some targets support connecting while the target's srst is asserted.
Tested on stm32 family.

Change-Id: I9df43623025e37832155aeee7aa099b844b85f16
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/606
Tested-by: jenkins
This commit is contained in:
Spencer Oliver 2012-05-01 13:18:42 +01:00
parent 9d31589d19
commit 6637cf9229
1 changed files with 12 additions and 1 deletions
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13
src/target/cortex_m.c
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@ -952,6 +952,16 @@ static int cortex_m3_assert_reset(struct target *target)
return ERROR_OK; return ERROR_OK;
} }
/* some cores support connecting while srst is asserted
* use that mode is it has been configured */
bool srst_asserted = false;
if (jtag_reset_config & RESET_SRST_NO_GATING) {
adapter_assert_reset();
srst_asserted = true;
}
/* Enable debug requests */ /* Enable debug requests */
int retval; int retval;
retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
@ -996,7 +1006,8 @@ static int cortex_m3_assert_reset(struct target *target)
if (jtag_reset_config & RESET_HAS_SRST) { if (jtag_reset_config & RESET_HAS_SRST) {
/* default to asserting srst */ /* default to asserting srst */
adapter_assert_reset(); if (!srst_asserted)
adapter_assert_reset();
} else { } else {
/* Use a standard Cortex-M3 software reset mechanism. /* Use a standard Cortex-M3 software reset mechanism.
* We default to using VECRESET as it is supported on all current cores. * We default to using VECRESET as it is supported on all current cores.