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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>
This commit is contained in:
Simon Glass 2015-10-18 19:51:26 -06:00
parent c7fefcb912
commit 60994a02a5
1 changed files with 3 additions and 8 deletions
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11
arch/x86/cpu/start.S
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@ -126,14 +126,9 @@ car_init_ret:
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