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--- project:arm_debugging:start [2020/03/18 21:02] – [J-link/JTrace] SystemView, STLink to JLink flash, ARM ETM tracing abyssal
+++ project:arm_debugging:start [2021/06/05 19:29] (current) – [Example: Unbricking (restoring) Proxmark bootloader] Flash bootloader and fullimage from same build abyssal
@@ Line 309: / Line 309: @@
 </code>
+Seems that flashing bootloader may not be enough, flash bootloader.elf and fullimage.elf from the same build in a single session (e.g. use ''file'' command in gdb), since mixing different branches may still result in bricked proxmark. Some bootloaders can't load fullimages built from other branches.
 ===== J-link connected to Proxmark =====
@@ Line 334: / Line 335: @@
 {{:project:arm_debugging:ozone_error_shutdown_highlighted.png?800|}}
+===== ARM ITM trace - recording samples of executed instructions, interrupts =====
+You can get code profile like this with ITM (screenshow from ''orbtop''):
+{{:project:arm_debugging:orbtop_trezor_lots_of_segwit_inputs.png|}}
+To get this working, [[https://github.com/hiviah/ITM-howto-JLink-STLink|follow this howto]]. It shows steps to be used with JLink/JTrace or STLink to get it moving.
 ====== Flyswatter connected to Proxmark ======