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x86: Init the debug UART if enabled

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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