SWD flashing using ST Link v2

usb 1-1.6.4: new full-speed USB device number 16 using ehci-pci
usb 1-1.6.4: New USB device found, idVendor=0483, idProduct=3748
usb 1-1.6.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.6.4: Product: STM32 STLink
usb 1-1.6.4: Manufacturer: STMicroelectronics
usb 1-1.6.4: SerialNumber: Qÿl^FH<85>PH'Q^C<87>

Problem:

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk/tool$ ./stlinkv2.py -s
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0002 -> 0001
CORE: 0de01477, CHIP_ID: 00000000
Flash ROM read protection: off
Option bytes: 00000000
Core does not halt, try API V2 halt.
ValueError('Status of core is not halt.', 128)

after several re-runs:

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk/tool$ ./stlinkv2.py -s
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0002 -> 0001
CORE: 1ba01477, CHIP_ID: a0036410
Flash ROM read protection: off
Option bytes: a0036410
Core does not halt, try API V2 halt.
ValueError('Status of core is not halt.', 128)

after a bit of fiddling with cables (it's always cables, right?)

Lovro contributed that if you are getting continous output like this

ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0002 -> 0001
Core does not halt, try API V2 halt.
ValueError('Status of core is not halt.', 128)

then run this while holding reset active (hold tweezers on both side of C3)
that should hand the uC in a mode that will enable stlinkv2.py script to turn off the flash rom protection and erase the flash while doing that

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk$ sudo ./tool/stlinkv2.py -s
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0002 -> 0001
CORE: 1ba01477, CHIP_ID: 20036410
Flash ROM read protection: ON
Option bytes: 03fffffe
The MCU is now stopped.
SUCCESS

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk$ sudo ./tool/stlinkv2.py -u
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0002 -> 0001
Status is 0081
CORE: 1ba01477, CHIP_ID: 20036410
Flash ROM read protection: ON
Option bytes: 03fffffe
Flash ROM read protection disabled.  Reset the board, now.
SUCCESS

# plugin, plugout st-link/v2

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk$ sudo ./tool/stlinkv2.py -s
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0100 -> 0001
CORE: 1ba01477, CHIP_ID: 20036410
Flash ROM read protection: off
Option bytes: ffff5aa5
Flash ROM blank check: True
SUCCESS

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk$ sudo ./tool/stlinkv2.py -b ../binaries/gnuk/gnuk.bin 
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0001 -> 0001
CORE: 1ba01477, CHIP_ID: 20036410
Flash ROM read protection: off
Option bytes: ffff5aa5
Flash ROM blank check: True
SPI Flash ROM ID: bf254a
WRITE
VERIFY
PROTECT
Flash ROM read protection enabled.  Reset the board to enable protection.
SUCCESS

# power cycle

dpavlin@blue:/blue-zfs/STM32/FST-01/gnuk$ sudo ./tool/stlinkv2.py -s
ST-Link/V2 version info: 2 17 4
Change ST-Link/V2 mode 0100 -> 0001
CORE: 1ba01477, CHIP_ID: 20036410
Flash ROM read protection: ON
Option bytes: 03fffffe
The MCU is now stopped.
SUCCESS

plugin just FST-01:

[ 9890.019368] usb 1-1.6.4: New USB device found, idVendor=234b, idProduct=0000
[ 9890.019372] usb 1-1.6.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 9890.019374] usb 1-1.6.4: Product: Gnuk Token
[ 9890.019375] usb 1-1.6.4: Manufacturer: Free Software Initiative of Japan
[ 9890.019377] usb 1-1.6.4: SerialNumber: FSIJ-1.0.4-50FF7006