Set development environment with UART debug output for aarch64

sys/main.c

@@ -25,13 +25,10 @@ k_main(void)
 {
 	uart_init();
 
-	uart_putc('L');
-	uart_putc('o');
-	uart_putc('w');
-	uart_putc('e');
-	uart_putc('\n');
+	uart_puts((unsigned char *) "Lowe OS\n");
 
 	for (;;) {
+		__asm__("WFE");
 	}
 }
 

sys/memmap

@@ -1,12 +0,0 @@
-    ENTRY(_start)
-
-    SECTIONS
-    {
-      . = 0x40000000;
-      .text : { *(.text) }
-      .data : { *(.data) }
-      .bss : { *(.bss COMMON) }
-      . = ALIGN(8);
-      . = . + 0x1000;
-      stack_ptr = . ;
-    }

sys/uart.c

@@ -15,7 +15,7 @@
 
 #include "uart.h"
 
-unsigned int *uart_base = (unsigned int *)UART_BASE;
+volatile unsigned int *UART0 = (unsigned int *)UART_BASE;
 
 
 void
@@ -24,10 +24,18 @@ uart_init(void)
 
 }
 
+
 void
 uart_putc(unsigned char c)
 {
-	*uart_base = c;
-	if(c == '\n')
-		*uart_base = '\r';
+	*UART0 = (unsigned int) c;
+}
+
+
+void
+uart_puts(const unsigned char *s)
+{
+	while(*s) {
+		*UART0 = (unsigned int) *(s++);
+	}
 }

sys/uart.h

@@ -22,9 +22,12 @@
 void
 uart_init(void);
 
+
 void
 uart_putc(unsigned char c);
 
 
+void
+uart_puts(const unsigned char *s);
 
 #endif /* !UART_H */