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jtag: improving jtag chain detection: now searching for masked and unmasked idcode

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This commit is contained in:
Gwenhael Goavec-Merou
2022-01-13 07:34:00 +01:00
parent 54a555855f
commit 1f59dfd671
2 changed files with 42 additions and 21 deletions
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src/jtag.cpp
+34 -21
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@@ -135,34 +135,28 @@ int Jtag::detectChain(int max_dev)
tmp = 0;
for (int ii=0; ii < 4; ii++)
tmp |= (rx_buff[ii] << (8*ii));
/* search IDCODE in fpga_list and misc_dev_list
* since most device have idcode with high nibble masked
* we start to search sub IDCODE
* if IDCODE has no match: try the same with version unmasked
*/
if (tmp != 0 && tmp != 0xffffffff) {
bool found = false;
/* ckeck highest nibble to prevent confusion between Cologne Chip
* GateMate and Efinix Trion T4/T8 devices
*/
if (tmp != 0x20000001)
tmp &= 0x0fffffff;
else
tmp &= 0xffffffff;
_devices_list.insert(_devices_list.begin(), tmp);
found = search_and_insert_device_with_idcode(tmp & 0x0fffffff);
if (!found) /* if masked not found -> search for full */
found = search_and_insert_device_with_idcode(tmp);
/* search for irlength in fpga_list or misc_dev_list */
uint16_t irlength = -1;
auto dev = fpga_list.find(tmp);
if (dev == fpga_list.end()) {
auto misc = misc_dev_list.find(tmp);
if (misc != misc_dev_list.end()) {
irlength = misc->second.irlength;
} else {
char error[256];
snprintf(error, 256, "Unknown device with IDCODE: 0x%08x",
tmp);
throw std::runtime_error(error);
}
} else {
irlength = dev->second.irlength;
if (!found) {
char error[256];
snprintf(error, 256, "Unknown device with IDCODE: 0x%08x",
tmp);
throw std::runtime_error(error);
}
_irlength_list.insert(_irlength_list.begin(), irlength);
}
}
go_test_logic_reset();
@@ -170,6 +164,25 @@ int Jtag::detectChain(int max_dev)
return _devices_list.size();
}
bool Jtag::search_and_insert_device_with_idcode(uint32_t idcode)
{
int irlength = -1;
auto dev = fpga_list.find(idcode);
if (dev != fpga_list.end())
irlength = dev->second.irlength;
if (irlength == -1) {
auto misc = misc_dev_list.find(idcode);
if (misc != misc_dev_list.end())
irlength = misc->second.irlength;
}
if (irlength == -1)
return false;
_devices_list.insert(_devices_list.begin(), idcode);
_irlength_list.insert(_irlength_list.begin(), irlength);
return true;
}
uint16_t Jtag::device_select(uint16_t index)
{
if (index > (uint16_t) _devices_list.size())