thanks to ultimo and others I think I have the pi2 switching back to svc and secure mode now.

and other cleanup

multi00/Makefile

@@ -1,6 +1,6 @@
 
-#ARMGNU ?= arm-none-eabi
-ARMGNU ?= arm-linux-gnueabi
+ARMGNU ?= arm-none-eabi
+#ARMGNU ?= arm-linux-gnueabi
 
 COPS = -Wall -O2 -nostdlib -nostartfiles -ffreestanding 
 

multi00/multi00.c

@@ -32,27 +32,33 @@ extern unsigned int timer_tick ( void );
 extern void start1 ( void );
 extern void start2 ( void );
 extern void start3 ( void );
+
+extern unsigned int showcpu0 ( void );
+
 //------------------------------------------------------------------------
 int notmain ( void )
 {
     unsigned int ra;
     unsigned int rb;
+    unsigned int rc;
 
     uart_init();
     hexstring(0x12345678);
-
+    hexstring(showcpu0());
     PUT32(0x40,0);
     ra=GET32(0x40);
     start1();
     start2();
     start3();
-    while(1)
+    for(rc=0;rc<10;)
+    //while(1)
     {
         rb=GET32(0x40);
         if(rb!=ra)
         {
             ra=rb;
             hexstring(ra);
+            rc++;
         }
     }
     return(0);

multi00/start.s

@@ -27,6 +27,12 @@ GETPC:
     mov r0,lr
     bx lr
 
+.globl showcpu0
+showcpu0:
+    mrc p15, 0, r0, c0, c0, 5
+    bx lr
+
+
 
 .globl start1
 start1: