[pyocd 0.26] pyocd gdbserver exceptions

[Hoohaha]

tested boards

1. twrk22f12, daplink version 0247
2. frdmk66f, daplink version 0243

description

1. At first, run command pyocd erase -c -u 0231000026294e450024000e58a900543ee1000097969900 to perform a chip erase.
2. Exceptions will occured on gdb command "load" is sent.

used gdb commands

target remote localhost: {gdbport}
load
monitor reset
q

note Verfied above steps works very well on version 0.14

pyocd gdbserver

$ pyocd gdbserver --trust-crc --uid 0231000026294e450024000e58a900543ee1000097969900 --port 7100 
0000675:WARNING:common:STLink and CMSIS-DAPv2 probes are not supported because no libusb library was found.
0001093:INFO:board:Target type is k22f
0001108:INFO:coresight_target:Performing connect pre-reset
0001342:INFO:dap:DP IDR = 0x2ba01477 (v1 rev2)
0001367:INFO:ap:AP#0 IDR = 0x24770011 (AHB-AP var1 rev2)
0001386:INFO:ap:AP#1 IDR = 0x001c0000 (proprietary)
0003197:WARNING:target_kinetis:K22F in secure state: will try to unlock via mass erase
0003426:WARNING:target_kinetis:K22F secure state: unlocked successfully
0003440:INFO:rom_table:AP#0 Class 0x1 ROM table #0 @ 0xe00ff000 (designer=43b part=4c4)
0003451:INFO:rom_table:[0]<e000e000:SCS-M4 class=14 designer=43b part=00c>
0003459:INFO:rom_table:[1]<e0001000:DWT class=14 designer=43b part=002>
0003467:INFO:rom_table:[2]<e0002000:FPB class=14 designer=43b part=003>
0003476:INFO:rom_table:[3]<e0000000:ITM class=14 designer=43b part=001>
0003484:INFO:rom_table:[4]<e0040000:TPIU-M4 class=9 designer=43b part=9a1 devtype=11 archid=0000 devid=ca0:0:0>
0003488:INFO:cortex_m:CPU core #0 is Cortex-M4 r0p1
0003501:INFO:dwt:4 hardware watchpoints
0003506:INFO:fpb:6 hardware breakpoints, 4 literal comparators
0003538:INFO:server:Semihost server started on port 4444 (core 0)
0003539:INFO:gdbserver:GDB server started on port 7100 (core 0)
0004069:INFO:gdbserver:One client connected!
0004102:ERROR:gdbserver:Unhandled exception in handle_message: type object 'CortexM' has no attribute 'DFSR_PMU'
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\pyocd\gdbserver\gdbserver.py", line 381, in handle_message
    reply = handler()
  File "c:\python27\lib\site-packages\pyocd\gdbserver\gdbserver.py", line 516, in stop_reason_query
    return self.create_rsp_packet(self.get_t_response())
  File "c:\python27\lib\site-packages\pyocd\gdbserver\gdbserver.py", line 1116, in get_t_response
    response = self.target_facade.get_t_response(forceSignal)
  File "c:\python27\lib\site-packages\pyocd\gdbserver\context_facade.py", line 138, in get_t_response
    response = six.b('T' + conversion.byte_to_hex2(self.get_signal_value()))
  File "c:\python27\lib\site-packages\pyocd\gdbserver\context_facade.py", line 152, in get_signal_value
    if self._context.core.is_vector_catch():
  File "c:\python27\lib\site-packages\pyocd\coresight\cortex_m.py", line 1335, in is_vector_catch
    return self.get_halt_reason() == Target.HaltReason.VECTOR_CATCH
  File "c:\python27\lib\site-packages\pyocd\coresight\cortex_m.py", line 1349, in get_halt_reason
    elif dfsr & CortexM.DFSR_PMU:
AttributeError: type object 'CortexM' has no attribute 'DFSR_PMU'
0008320:ERROR:gdbserver:Unhandled exception in handle_message: init error: 536870913
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\pyocd\gdbserver\gdbserver.py", line 383, in handle_message
    reply = handler(msg[msgStart:])
  File "c:\python27\lib\site-packages\pyocd\gdbserver\gdbserver.py", line 602, in v_command
    return self.flash_op(data)
  File "c:\python27\lib\site-packages\pyocd\gdbserver\gdbserver.py", line 718, in flash_op
    self.flash_loader.commit()
  File "c:\python27\lib\site-packages\pyocd\flash\loader.py", line 168, in commit
    keep_unwritten=self._keep_unwritten)
  File "c:\python27\lib\site-packages\pyocd\flash\builder.py", line 417, in program
    self._build_sectors_and_pages(keep_unwritten)
  File "c:\python27\lib\site-packages\pyocd\flash\builder.py", line 315, in _build_sectors_and_pages
    fill_end_of_page_gap()
  File "c:\python27\lib\site-packages\pyocd\flash\builder.py", line 259, in fill_end_of_page_gap
    self._enable_read_access()
  File "c:\python27\lib\site-packages\pyocd\flash\builder.py", line 221, in _enable_read_access
    self.flash.init(self.flash.Operation.VERIFY)
  File "c:\python27\lib\site-packages\pyocd\flash\flash.py", line 250, in init
    raise FlashFailure('init error: %i' % result, result_code=result)
FlashFailure: init error: 536870913
0008342:INFO:gdbserver:Client detached
0008342:INFO:gdbserver:Client disconnected!
0008546:INFO:server:Semihost server stopped

[flit]

Thanks @Hoohaha for the detailed bug report.

[Hoohaha]

@flit Another exception FlashFailure: init error: 536870913, what does that mean?

[Hoohaha]

seems add under-reset it can improve the stability for kinetis.

[flit]

Fyi, I'm able to reproduce the flash failure. It's failing when trying to init the flash algo in "verify" mode.

[flit]

Tried with the K22FN512VDC12 CMSIS-Pack and got a similar failure but different error code.

The built-in flash algo reports error 0x20000001 (536870913). The pack flash algo reports error 0x1fff0201 (536805889).

Neither of these make sense to me…

[flit]

@Hoohaha I ended up just working around the verify init failures. If it gets an exception during a verify init, it will retry to init in erase mode. That works at least in the case here.

[Hoohaha]

Thanks flit!