Change in simtrace2[master]: add make DEFINE to remove assert ERASE code

[Harald Welte]

Harald Welte has submitted this change and it was merged. ( https://gerrit.osmocom.org/14147 )

Change subject: add make DEFINE to remove assert ERASE code
......................................................................

add make DEFINE to remove assert ERASE code

remove code to assert peer ERASE line by default.
see README for more information.

Change-Id: I5f88ecf1e2dcf00c0297597f88dd361a6e088c1e
---
M firmware/Makefile
M firmware/README.txt
M firmware/libboard/qmod/source/board_qmod.c
3 files changed, 17 insertions(+), 1 deletion(-)

Approvals:
  Harald Welte: Looks good to me, approved
  Jenkins Builder: Verified



diff --git a/firmware/Makefile b/firmware/Makefile
index c0f53f3..fa72bd3 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -120,6 +120,10 @@
 # TRACE_LEVEL_NO_TRACE   0
 TRACE_LEVEL ?= 4
 
+# allow asserting the peer SAM3S ERASE signal to completely erase the flash
+# only applicable for qmod board
+ALLOW_PEER_ERASE?=0
+
 DEBUG_PHONE_SNIFF?=0
 
 #CFLAGS+=-DUSB_NO_DEBUG=1
@@ -163,7 +167,7 @@
 #CFLAGS += -Wa,-a,-ad
 CFLAGS += -D__ARM
 CFLAGS += --param max-inline-insns-single=500 -mcpu=cortex-m3 -mthumb # -mfix-cortex-m3-ldrd
-CFLAGS += -ffunction-sections -g $(OPTIMIZATION) $(INCLUDES) -D$(CHIP) -DTRACE_LEVEL=$(TRACE_LEVEL) -DDEBUG_PHONE_SNIFF=$(DEBUG_PHONE_SNIFF)
+CFLAGS += -ffunction-sections -g $(OPTIMIZATION) $(INCLUDES) -D$(CHIP) -DTRACE_LEVEL=$(TRACE_LEVEL) -DDEBUG_PHONE_SNIFF=$(DEBUG_PHONE_SNIFF) -DALLOW_PEER_ERASE=$(ALLOW_PEER_ERASE)
 CFLAGS += -DGIT_VERSION=\"$(GIT_VERSION)\"
 CFLAGS += -DBOARD=\"$(BOARD)\" -DBOARD_$(BOARD)
 CFLAGS += -DAPPLICATION=\"$(APP)\" -DAPPLICATION_$(APP)
diff --git a/firmware/README.txt b/firmware/README.txt
index dcbafb2..fa7f60a 100644
--- a/firmware/README.txt
+++ b/firmware/README.txt
@@ -76,6 +76,10 @@
 ```
 Accepted values: 0 (NO_TRACE) to 5 (DEBUG)
 
+The qmod specific option `ALLOW_PEER_ERASE` controls if the UART debug command to assert the peer SAM3S ERASE line is present in the code.
+Per default this is set to 0 to prevent accidentally erasing all firmware, including the DFU bootloader, which would then need to be flashed using SAM-BA or JTAG/SWD.
+Setting `ALLOW_PEER_ERASE` to 1 enables back the debug command and should be used only for debugging or development purposes.
+
 = Flashing
 
 To flash a firmware image follow the instructions provided in the [wiki](https://projects.osmocom.org/projects/simtrace2/wiki/).
diff --git a/firmware/libboard/qmod/source/board_qmod.c b/firmware/libboard/qmod/source/board_qmod.c
index cab5271..4d75b98 100644
--- a/firmware/libboard/qmod/source/board_qmod.c
+++ b/firmware/libboard/qmod/source/board_qmod.c
@@ -184,10 +184,12 @@
 /* returns '1' in case we should break any endless loop */
 void board_exec_dbg_cmd(int ch)
 {
+#if (ALLOW_PEER_ERASE > 0)
 	/* this variable controls if it is allowed to assert/release the ERASE line.
 	   this is done to prevent accidental ERASE on noisy serial input since only one character can trigger the ERASE.
 	 */
 	static bool allow_erase = false;
+#endif
 
 	switch (ch) {
 	case '?':
@@ -209,9 +211,11 @@
 		}
 		printf("\tX\tRelease peer SAM3 from reset\n\r");
 		printf("\tx\tAssert peer SAM3 reset\n\r");
+#if (ALLOW_PEER_ERASE > 0)
 		printf("\tY\tRelease peer SAM3 ERASE signal\n\r");
 		printf("\ta\tAllow asserting peer SAM3 ERASE signal\n\r");
 		printf("\ty\tAssert peer SAM3 ERASE signal\n\r");
+#endif
 		printf("\tU\tProceed to USB Initialization\n\r");
 		printf("\t1\tGenerate 1ms reset pulse on WWAN1\n\r");
 		printf("\t2\tGenerate 1ms reset pulse on WWAN2\n\r");
@@ -245,6 +249,7 @@
 		printf("Setting _SIMTRACExx_RST -> SIMTRACExx_RST low (active)\n\r");
 		PIO_Set(&pin_peer_rst);
 		break;
+#if (ALLOW_PEER_ERASE > 0)
 	case 'Y':
 		printf("Clearing SIMTRACExx_ERASE (inactive)\n\r");
 		PIO_Clear(&pin_peer_erase);
@@ -261,6 +266,7 @@
 			printf("Please first allow setting SIMTRACExx_ERASE\n\r");
 		}
 		break;
+#endif
 	case '1':
 		printf("Resetting Modem 1 (of this SAM3)\n\r");
 		wwan_perst_do_reset_pulse(0, 300);
@@ -283,10 +289,12 @@
 		break;
 	}
 
+#if (ALLOW_PEER_ERASE > 0)
 	// set protection back so it can only run for one command
 	if ('a' != ch) {
 		allow_erase = false;
 	}
+#endif
 }
 
 void board_main_top(void)

-- 
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Gerrit-Project: simtrace2
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I5f88ecf1e2dcf00c0297597f88dd361a6e088c1e
Gerrit-Change-Number: 14147
Gerrit-PatchSet: 2
Gerrit-Owner: Kévin Redon <kredon at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder (1000002)
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