- add cortex_m3 variant luminary to fix reset issue with asserting SRST

- https://lists.berlios.de/pipermail/openocd-development/2008-April/002022.html for details

git-svn-id: svn://svn.berlios.de/openocd/trunk@624 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/target/cortex_m3.c

@@ -706,6 +706,18 @@ int cortex_m3_assert_reset(target_t *target)
 		ahbap_write_system_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 	}
 	
+	/* following hack is to handle luminary reset
+	 * when srst is asserted the luminary device seesm to also clear the debug registers
+	 * which does not match the armv7 debug TRM */
+		
+	if (strcmp(cortex_m3->variant, "luminary") == 0)
+	{
+		/* this causes the luminary device to reset using the watchdog */
+		ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ );
+		LOG_DEBUG("Using Luminary Reset: SYSRESETREQ");
+	}
+	else
+	{
 		if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 		{
 			jtag_add_reset(1, 1);
@@ -714,6 +726,7 @@ int cortex_m3_assert_reset(target_t *target)
 		{
 			jtag_add_reset(0, 1);
 		}
+	}
 	
 	target->state = TARGET_RESET;
 	jtag_add_sleep(50000);
@@ -1438,6 +1451,15 @@ int cortex_m3_init_arch_info(target_t *target, cortex_m3_common_t *cortex_m3, in
 	armv7m->pre_restore_context = NULL;
 	armv7m->post_restore_context = NULL;
 	
+	if (variant)
+	{
+		cortex_m3->variant = strdup(variant);
+	}
+	else
+	{
+		cortex_m3->variant = strdup("");
+	}
+	
 	armv7m_init_arch_info(target, armv7m);	
 	armv7m->arch_info = cortex_m3;
 	armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32;

src/target/cortex_m3.h

@@ -134,8 +134,8 @@ typedef struct  cortex_m3_dwt_comparator_s
 typedef struct cortex_m3_common_s
 {
 	int common_magic;
-	
 	arm_jtag_t jtag_info;
+	char *variant;
 	
 	/* Context information */
 	u32 dcb_dhcsr;

src/target/target/lm3s6965.cfg

@@ -8,7 +8,10 @@ reset_config srst_only
 #format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)
 jtag_device 4 0x1 0xf 0xe
 
-target cortex_m3 little run_and_halt 0
+# the luminary variant causes a software reset rather than asserting SRST
+# this stops the debug registers from being cleared
+# this will be fixed in later revisions of silicon
+target cortex_m3 little reset_halt 0 luminary
 
 # 4k working area at base of ram
 working_area 0 0x20000000 0x4000 nobackup

src/target/target/lm3s811.cfg

@@ -8,7 +8,10 @@ reset_config srst_only
 #format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)
 jtag_device 4 0x1 0xf 0xe
 
-target cortex_m3 little run_and_halt 0
+# the luminary variant causes a software reset rather than asserting SRST
+# this stops the debug registers from being cleared
+# this will be fixed in later revisions of silicon
+target cortex_m3 little reset_halt 0 luminary
 
 # 2k working area at base of ram
 working_area 0 0x20000000 0x2000 nobackup