Set development environment with UART debug output for aarch64

aarch64/boot.S

@@ -1,22 +0,0 @@
-	.global _boot
-	.extern k_main
-
-
-_boot:
-	mrs x0, mpidr_el1       // Check CPU ID
-	mov x1, 0xC1000000
-	bic x0, x0, x1
-	cbz x0, set_stack
-	b idle
-
-set_stack:
-	ldr     x30, =0x40001000
-	mov     sp,  x30
-	bl      start
-
-start:
-	mov x0, x30
-	bl k_main
-
-idle: b idle
-

aarch64/boot.s

@@ -1,10 +1,7 @@
-	.text
-
 	.globl _start
-	.extern k_main
-	.extern stack_ptr 
 
 _start:
+
 	mrs x0, mpidr_el1       // Check CPU ID
 	mov x1, 0xC1000000
 	bic x0, x0, x1
@@ -12,13 +9,9 @@ _start:
 	b   idle
 
 set_stack:
-	ldr x30, stack_ptr  // defined in sys/memmap
+	ldr x30, =stack_ptr  // defined in sys/memmap
 	mov sp,  x30
-	bl  start
-
-start:
-	mov x0, x30
-	bl k_main
+	bl  k_main
 
 idle:
 	b idle

aarch64/memmap

@@ -0,0 +1,16 @@
+ENTRY(_start)
+
+SECTIONS
+{
+	/* For some reason qemu UART doesn't work with smaller address */
+	. = 0x40000000; 
+
+	.boot . : { boot.o(.text) }
+	.text : { *(.text) }
+	.data : { *(.data) }
+	.bss : { *(.bss COMMON) }
+
+	. = ALIGN(8);
+	. = . + 0x1000;
+	stack_ptr = . ;
+}