Fix Xduoo X3 bootloader build, and silence all warnings.

Also enable USB bootloader mode

Change-Id: I73224c2e694b9941993c89a114b48d2a907e0dfb

firmware/target/mips/ingenic_jz47xx/debug-jz4760.c

@@ -169,3 +169,106 @@ bool dbg_hw_info(void)
     }
     return true;
 }
+
+#define CFG_UART_BASE           UART1_BASE      /* Base of the UART channel */
+
+void serial_putc (const char c)
+{
+        volatile u8 *uart_lsr = (volatile u8 *)(CFG_UART_BASE + OFF_LSR);
+        volatile u8 *uart_tdr = (volatile u8 *)(CFG_UART_BASE + OFF_TDR);
+
+        if (c == '\n') serial_putc ('\r');
+
+        /* Wait for fifo to shift out some bytes */
+        while ( !((*uart_lsr & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60) );
+
+        *uart_tdr = (u8)c;
+}
+
+void serial_puts (const char *s)
+{
+        while (*s) {
+                serial_putc (*s++);
+        }
+}
+
+void serial_putsf(const char *format, ...)
+{
+    static char printfbuf[256];
+    int len;
+    unsigned char *ptr;
+    va_list ap;
+    va_start(ap, format);
+
+    ptr = printfbuf;
+    len = vsnprintf(ptr, sizeof(printfbuf), format, ap);
+    va_end(ap);
+    (void)len;
+
+    serial_puts(ptr);
+    serial_putc('\n');
+}
+
+void serial_put_hex(unsigned int  d)
+{
+        char c[12];
+        int i;
+        for(i = 0; i < 8;i++)
+        {
+                c[i] = (d >> ((7 - i) * 4)) & 0xf;
+                if(c[i] < 10)
+                        c[i] += 0x30;
+                else
+                        c[i] += (0x41 - 10);
+        }
+        c[8] = '\n';
+        c[9] = 0;
+        serial_puts(c);
+
+}
+void serial_put_dec(unsigned int  d)
+{
+        char c[16];
+        int i;
+        int j = 0;
+        int x = d;
+
+        while (x /= 10)
+                j++;
+
+        for (i = j; i >= 0; i--) {
+                c[i] = d % 10;
+                c[i] += 0x30;
+                d /= 10;
+        }
+        c[j + 1] = '\n';
+        c[j + 2] = 0;
+        serial_puts(c);
+}
+
+void serial_dump_data(unsigned char* data, int len)
+{
+        int i;
+        for(i=0; i<len; i++)
+        {
+                unsigned char a = ((*data)>>4) & 0xf;
+                if(a < 10)
+                        a += 0x30;
+                else
+                        a += (0x41 - 10);
+                serial_putc( a );
+
+                a = (*data) & 0xf;
+                if(a < 10)
+                        a += 0x30;
+                else
+                        a += (0x41 - 10);
+                serial_putc( a );
+
+                serial_putc( ' ' );
+
+                data++;
+        }
+
+        serial_putc( '\n' );
+}

firmware/target/mips/ingenic_jz47xx/xduoo_x3/sadc-xduoo_x3.c

@@ -18,7 +18,7 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
- 
+
 #include "config.h"
 #include "system.h"
 #include "cpu.h"
@@ -86,11 +86,13 @@ bool button_hold(void)
 
 int button_read_device(void)
 {
+#ifndef BOOTLOADER
     static bool hold_button = false;
     bool hold_button_old;
 
     hold_button_old = hold_button;
     hold_button = (__gpio_get_pin(PIN_BTN_HOLD) ? true : false);
+#endif
 
     int btn = BUTTON_NONE;
     bool gpio_btn = (__gpio_get_pin(PIN_BTN_POWER) ? false : true);