[rtt] Zero SRAM when using RTT

This prevents OpenOCD from leaking RTT identifier into SRAM which is used to buffer the firmware during uploading.
modm-io · Dec 6, 2021 · bea7f08 · bea7f08
1 parent 7e9a8ba
commit bea7f08
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/tools/build_script_generator/openocd.cfg.in b/tools/build_script_generator/openocd.cfg.in
@@ -19,6 +19,10 @@ proc modm_itm_log { OUTPUT F_CPU {BAUDRATE 2000000} } {
 
 proc modm_program { SOURCE } {
 	program $SOURCE verify
+%% if has_rtt
+	# Zero SRAM to prevent OpenOCD from leaking RTT identifier into memory
+	mww 0x{{"%0x" % main_ram.start}} 0 {{main_ram.size // 4}}
+%% endif
 	reset run
 	shutdown
 }