Differences

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--- project:arm_debugging:start [2019/08/21 16:00] – [Example: Unbricking (restoring) Proxmark bootloader] trimen
+++ project:arm_debugging:start [2019/12/07 18:16] – [Black Magic Probe] BMP + execution trace abyssal
@@ Line 471: / Line 471: @@
 There is a [[https://brmlab.cz/project/chipwhisperer/start | separate project for Chipwhisperer]] and its usage for side channels. Look there.
+===== JTAG supplying external clock =====
+It seems that when you desolder clocks (e.g. from crystal oscillator) the SWD/JTAG clock (SWCLK/TCK) can supply the clock to the chip which can be useful e.g. when you need glitch clock, but still would need operation via SWD/JTAG. Tested on [[https://brmlab.cz/project/chipwhisperer/start#glitching_stm32_external_board_through_ufo-board_interface | STM32F429 discovery board]].
+Doesn't seem to work with Black Magic probe without clock.
+===== Black Magic Probe =====
+[[https://github.com/blacksphere/blackmagic/wiki | Black Magic Probe]] (BMP) a replacement either for STLink firmware or usable as firmware on various ARMs to debug other ARMs.
+Pinout on the debug board is only findable in sources under src/platforms.
+BMP creates /dev/ttyACM* interface that can be used without OpenOCD as extended-remote target (see BMP wiki).
+Some interesting features compared to old OpenOCD+gdb is tracing support:
+  * https://github.com/blacksphere/blackmagic/wiki/Serial-Wire-Debug-TRACESWO-support
+  * https://github.com/orbcode/orbuculum
+Note that you have to disable memory protections in order to read some memory (set mem inaccessible-by-default off), even then some parts that are accessible via STLink are not with BMP.