diff --git a/src/jtag/drivers/driver.c b/src/jtag/drivers/driver.c index fae2aad22..e52816d3a 100644 --- a/src/jtag/drivers/driver.c +++ b/src/jtag/drivers/driver.c @@ -116,12 +116,21 @@ int interface_jtag_add_dr_scan(struct jtag_tap *active, int in_num_fields, /* count devices in bypass */ size_t bypass_devices = 0; + size_t all_devices = 0; for (struct jtag_tap *tap = jtag_tap_next_enabled(NULL); tap; tap = jtag_tap_next_enabled(tap)) { + all_devices++; + if (tap->bypass) bypass_devices++; } + if (all_devices == bypass_devices) { + LOG_ERROR("At least one TAP shouldn't be in BYPASS mode"); + + return ERROR_FAIL; + } + struct jtag_command *cmd = cmd_queue_alloc(sizeof(struct jtag_command)); struct scan_command *scan = cmd_queue_alloc(sizeof(struct scan_command)); struct scan_field *out_fields = cmd_queue_alloc((in_num_fields + bypass_devices) * sizeof(struct scan_field));