x86: Init the debug UART if enabled

If the debug UART is enabled, get it ready for use at the earliest possible
opportunity. This is not actually very early, but until we have a stack it
is difficult to make it work.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index d072825..5b4ee79 100644 (file)
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -126,14 +126,9 @@ car_init_ret:
        call    board_init_f_mem
        mov     %eax, %esp
 
        call    board_init_f_mem
        mov     %eax, %esp
 

-       /*
-        * Debug UART is available here although it may not be plumbed out
-        * to pins depending on the board. To use it:
-        *
-        * call  debug_uart_init
-        * mov   $'a', %eax
-        * call  printch
-        */
+#ifdef CONFIG_DEBUG_UART
+       call    debug_uart_init
+#endif

 
        /* Get address of global_data */
        mov     %fs:0, %edx
 
        /* Get address of global_data */
        mov     %fs:0, %edx