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jtag_scan: Reworked IR length and device count scanning when irlens is not given

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dragonmux 2022-07-27 10:44:57 +01:00 committed by Piotr Esden-Tempski
parent 9f35763199
commit 190c45b450
1 changed files with 23 additions and 13 deletions
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32
src/target/jtag_scan.c
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@ -118,25 +118,35 @@ int jtag_scan(const uint8_t *irlens)
DEBUG_INFO("Scanning out IRs\n");
/* IEEE 1149.1 requires the first bit to be a 1, but not all devices conform (see #1130 on GH) */
if (!jtag_proc.jtagtap_next(0, 1))
if (!jtag_proc.jtagtap_next(false, true))
DEBUG_WARN("jtag_scan: Sanity check failed: IR[0] shifted out as 0\n");
jtag_devs[0].ir_len = 1; j = 1;
while((jtag_dev_count <= JTAG_MAX_DEVS) &&
(jtag_devs[jtag_dev_count].ir_len <= JTAG_MAX_IR_LEN)) {
if(jtag_proc.jtagtap_next(0, 1)) {
if(jtag_devs[jtag_dev_count].ir_len == 1) break;
jtag_devs[++jtag_dev_count].ir_len = 1;
jtag_devs[jtag_dev_count].ir_prescan = j;
jtag_devs[jtag_dev_count].jd_dev = jtag_dev_count;
} else jtag_devs[jtag_dev_count].ir_len++;
j++;
jtag_devs[0].ir_len = 1;
size_t device = 0;
for (size_t prescan = 1; device <= JTAG_MAX_DEVS && jtag_devs[device].ir_len <= JTAG_MAX_IR_LEN;) {
/* If we read out a '1' from TDO, we're at the end of the current device and the start of the next */
if (jtag_proc.jtagtap_next(false, true)) {
/* If the device was not actually a new device, exit */
if (jtag_devs[device].ir_len == 1)
break;
++device;
/* Set up the next device */
jtag_devs[device].ir_len = 1;
jtag_devs[device].ir_prescan = prescan;
jtag_devs[device].jd_dev = device;
} else
/* Otherwise we have another bit in this device's IR */
++jtag_devs[device].ir_len;
++prescan;
}
jtag_dev_count = device;
if (jtag_dev_count > JTAG_MAX_DEVS) {
DEBUG_WARN("jtag_scan: Maximum device count exceeded\n");
jtag_dev_count = -1;
return -1;
}
if (jtag_devs[jtag_dev_count].ir_len > JTAG_MAX_IR_LEN) {
DEBUG_WARN("jtag_scan: Maximum IR length exceeded\n");
jtag_dev_count = -1;