Adding lm32 demo to SAKC project

lm32/logic/sakc/firmware/boot0-serial/main.c

@@ -0,0 +1,57 @@
+/**
+ * Primitive first stage bootloader 
+ *
+ *
+ */
+#include "soc-hw.h"
+
+/* prototypes */
+uint32_t read_uint32()
+{
+	uint32_t val = 0, i;
+
+    for (i = 0; i < 4; i++) {
+        val <<= 8;
+        val += (uint8_t)uart_getchar();
+    }
+
+    return val;
+}
+
+int main(int argc, char **argv)
+{
+	int8_t  *p;
+	uint8_t  c;
+
+	// Initialize UART
+	uart_init();
+
+	c = '*'; // print msg on first iteration
+	for(;;) {
+		uint32_t start, size; 
+
+		switch (c) {
+    		case 'u': // upload 
+    			start = read_uint32();
+    			size  = read_uint32();
+    			for (p = (int8_t *) start; p < (int8_t *) (start+size); p++)
+    				*p = uart_getchar();
+    			break;
+		case 'd': // download
+    			start = read_uint32();
+    			size  = read_uint32();
+    			for (p = (int8_t *) start; p < (int8_t *) (start+size); p++)
+				uart_putchar( *p );
+    			break;
+    		case 'g': // goto
+    			start = read_uint32();
+    			jump(start);
+    			break;   
+		default:
+			uart_putstr("**SAKC/bootloader** > \r\n");
+			break;
+		};
+		c = uart_getchar();
+	}
+}
+