diff options
Diffstat (limited to 'src/target/arm7_9_common.c')
| -rw-r--r-- | src/target/arm7_9_common.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/src/target/arm7_9_common.c b/src/target/arm7_9_common.c index 40dddda6..2b064f23 100644 --- a/src/target/arm7_9_common.c +++ b/src/target/arm7_9_common.c @@ -1021,12 +1021,19 @@ int arm7_9_assert_reset(target_t *target) return ERROR_FAIL; } - /* at this point trst has been asserted/deasserted once. We want to - * program embedded ice while SRST is asserted, but some CPUs gate - * the JTAG clock while SRST is asserted + /* At this point trst has been asserted/deasserted once. We would + * like to program EmbeddedICE while SRST is asserted, instead of + * depending on SRST to leave that module alone. However, many CPUs + * gate the JTAG clock while SRST is asserted; or JTAG may need + * clock stability guarantees (adaptive clocking might help). + * + * So we assume JTAG access during SRST is off the menu unless it's + * been specifically enabled. */ bool srst_asserted = false; - if (((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0) && ((jtag_reset_config & RESET_SRST_GATES_JTAG) == 0)) + + if (((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0) + && (jtag_reset_config & RESET_SRST_NO_GATING)) { jtag_add_reset(0, 1); srst_asserted = true; |