[sam] introducing sam3u-ek and arduino due into variants, libsam is broken

hardware/sam/variants/arduino_due/debug_scripts/gcc/arduino_due_flash.gdb

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+#*******************************************************
+#
+#  Connect to J-Link and debug application in flash.
+#
+
+# define 'reset' command
+define reset
+
+# Connect to the J-Link gdb server
+target remote localhost:2331
+# Reset the chip to get to a known state
+monitor reset
+
+# Select flash device
+monitor flash device = AT91SAM3U4E
+# Enable flash download and flash breakpoints
+monitor flash download = 1
+# Load the program
+load
+
+# Reset peripheral  (RSTC_CR)
+set *0x400e1200 = 0xA5000004
+
+# Initializing PC and stack pointer
+mon reg sp=(0x80000)
+set *0x80004 = *0x80004 & 0xFFFFFFFE
+mon reg pc=(0x80004)
+info reg
+
+# end of 'reset' command
+end

hardware/sam/variants/arduino_due/debug_scripts/gcc/arduino_due_sram.gdb

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+#*************************************************
+#
+#  Connect to J-Link and debug application in sram on SAM3U
+#
+# Note:
+#     First,users should do Step1 and Step2 according to your project,
+#     then do Step3.
+
+# Step1: Connect to the J-Link gdb server
+#target remote localhost:2331
+#mon reset
+
+# Step2: Load file(eg. getting-started project)
+#load bin/basic-dhrystone-project-at91sam3u-ek-at91sam3u4-sram.elf
+#symbol-file bin/basic-dhrystone-project-at91sam3u-ek-at91sam3u4-sram.elf
+
+# Step3: Initializing PC and stack pointer
+# Perpheral reset RSTC_CR
+set *0x400e1200 = 0xA5000004
+# Modify pc value to even before writing pc register
+mon reg sp=(0x20000000)
+set *0x20000004 = *0x20000004 & 0xFFFFFFFE
+mon reg pc=(0x20000004)

hardware/sam/variants/arduino_due/debug_scripts/iar/arduino_due_flash.mac

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+// ---------------------------------------------------------
+//   ATMEL Microcontroller Software Support  -  ROUSSET  -
+// ---------------------------------------------------------
+// The software is delivered "AS IS" without warranty or
+// condition of any  kind, either express, implied or
+// statutory. This includes without limitation any warranty
+// or condition with respect to merchantability or fitness
+// for any particular purpose, or against the infringements of
+// intellectual property rights of others.
+// ---------------------------------------------------------
+//  File: at91sam3u-ek-flash.mac
+//  User setup file for CSPY debugger.
+// ---------------------------------------------------------
+__var __mac_i;
+__var __mac_pt;
+
+/*********************************************************************
+*
+*       execUserReset()
+*/
+execUserReset()
+{
+    __message "------------------------------ execUserReset ---------------------------------";
+    __message "-------------------------------Set PC Reset ----------------------------------";
+
+    __hwReset(0);
+
+    // perpheral reset RSTC_CR
+    __writeMemory32(0xA5000004,0x400e1200,"Memory");
+}
+
+/*********************************************************************
+*
+*       execUserPreload()
+*/
+execUserPreload()
+{
+    __message "------------------------------ execUserPreload ---------------------------------";
+
+    __hwReset(0);                          //* Hardware Reset: CPU is automatically halted after the reset
+
+    // perpheral reset RSTC_CR
+    __writeMemory32(0xA5000004,0x400e1200,"Memory");
+}

hardware/sam/variants/arduino_due/debug_scripts/iar/arduino_due_sram.mac

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+// ---------------------------------------------------------
+//   ATMEL Microcontroller Software Support  -  ROUSSET  -
+// ---------------------------------------------------------
+// The software is delivered "AS IS" without warranty or
+// condition of any  kind, either express, implied or
+// statutory. This includes without limitation any warranty
+// or condition with respect to merchantability or fitness
+// for any particular purpose, or against the infringements of
+// intellectual property rights of others.
+// ---------------------------------------------------------
+//  File: at91sam3u-ek-sram.mac
+//  User setup file for CSPY debugger.
+// ---------------------------------------------------------
+__var __mac_i;
+__var __mac_pt;
+
+/*********************************************************************
+*
+*       execUserReset()
+*/
+execUserReset()
+{
+    __message "------------------------------ execUserReset ---------------------------------";
+    __message "-------------------------------Set PC Reset ----------------------------------";
+
+     //__hwReset(50);
+
+    // perpheral reset RSTC_CR
+    __writeMemory32(0xA5000004,0x400e1200,"Memory");
+}
+
+/*********************************************************************
+*
+*       execUserPreload()
+*/
+execUserPreload()
+{
+    __message "------------------------------ execUserPreload ---------------------------------";
+
+    __hwReset(0);                          //* Hardware Reset: CPU is automatically halted after the reset
+    
+    // perpheral reset RSTC_CR
+    __writeMemory32(0xA5000004,0x400e1200,"Memory");
+}