summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/jtag/jtag.h1
-rw-r--r--src/jtag/tcl.c8
-rw-r--r--src/target/arm7_9_common.c13
3 files changed, 21 insertions, 1 deletions
diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h
index b7bfd4cc..f716806b 100644
--- a/src/jtag/jtag.h
+++ b/src/jtag/jtag.h
@@ -277,6 +277,7 @@ enum reset_types {
RESET_TRST_PULLS_SRST = 0x8,
RESET_TRST_OPEN_DRAIN = 0x10,
RESET_SRST_PUSH_PULL = 0x20,
+ RESET_SRST_GATES_JTAG = 0x40,
};
enum reset_types jtag_get_reset_config(void);
diff --git a/src/jtag/tcl.c b/src/jtag/tcl.c
index e6928a2b..1658f76a 100644
--- a/src/jtag/tcl.c
+++ b/src/jtag/tcl.c
@@ -845,6 +845,14 @@ static int handle_reset_config_command(struct command_context_s *cmd_ctx, char *
int tmp = 0;
int m;
+ m = RESET_SRST_GATES_JTAG;
+ tmp = 0;
+ if (strcmp(*args, "srst_gates_jtag") == 0)
+ {
+ tmp = RESET_SRST_GATES_JTAG;
+ goto next;
+ }
+
/* signals */
m = RESET_HAS_TRST | RESET_HAS_SRST;
if (strcmp(*args, "none") == 0)
diff --git a/src/target/arm7_9_common.c b/src/target/arm7_9_common.c
index 9f05d777..e2eb0d5c 100644
--- a/src/target/arm7_9_common.c
+++ b/src/target/arm7_9_common.c
@@ -1021,6 +1021,17 @@ 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
+ */
+ bool srst_asserted = false;
+ if (((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0) && ((jtag_reset_config & RESET_SRST_GATES_JTAG) == 0))
+ {
+ jtag_add_reset(0, 1);
+ srst_asserted = true;
+ }
+
if (target->reset_halt)
{
/*
@@ -1053,7 +1064,7 @@ int arm7_9_assert_reset(target_t *target)
if (jtag_reset_config & RESET_SRST_PULLS_TRST)
{
jtag_add_reset(1, 1);
- } else
+ } else if (!srst_asserted)
{
jtag_add_reset(0, 1);
}