Fix uart_mini initialization and emulation

kernel/aarch64/aarch64.S

@@ -26,7 +26,7 @@ aarch64_set32r:
 
 .globl aarch64_delay
 aarch64_delay:
-	subs x0, x0, 0x01
+	subs x0, x0, 1
 	bne aarch64_delay
 	ret
 

kernel/aarch64/aarch64.ld

@@ -1,16 +1,15 @@
-ENTRY(_start)
-
 SECTIONS
 {
-	/* For some reason qemu UART doesn't work with smaller address */
-	. = 0x40000000; 
-
-	.boot . : { boot.o(.text) }
+	.text.boot : { *(.text.boot) }
 	.text : { *(.text) }
+	.rodata : { *(.rodata) }
 	.data : { *(.data) }
-	.bss : { *(.bss COMMON) }
+	. = ALIGN(0x8);
+	bss_begin = .;
+	.bss : { *(.bss*) } 
+	bss_end = .;
 
 	. = ALIGN(8);
-	. = . + 0x1000;
+	. = . + 0x8000;
 	stack_ptr = . ;
 }

kernel/aarch64/boot.S

@@ -1,7 +1,8 @@
 
 #include "aarch64_reg.h"
 
-	.globl _start
+.section ".text.boot"
+.globl _start
 
 _start:
 	mrs x0, mpidr_el1       /* Check CPU ID */
@@ -12,10 +13,6 @@ idle:
 	b idle
 
 set_el:
-	/* check current exception level */
-	bl aarch64_get_el
-	cmp x0, 0x03
-	bne set_stack
 	/* set SCTRL_EL1 */
 	ldr x0, =SCTLR_VALUE_MMU_DISABLED
 	msr sctlr_el1, x0
@@ -36,6 +33,9 @@ set_el:
 set_stack:
 	ldr x30, =stack_ptr  /* defined in aarch64.ld */
 	mov sp,  x30
+	bl skip
+skip:
 	bl  k_main
+hang: b hang