[U-Boot] [PATCH v2 06/51] x86: Allow use of serial soon after relocation

[Bin Meng]

On Sat, Mar 12, 2016 at 1:06 PM, Simon Glass <sjg at chromium.org> wrote:
> At present on x86 machines with use cache-as-RAM, the memory goes away just
> before board_init_r() is called. This means that serial drivers are
> no-longer unavailable, until initr_dm() it called, etc.
>
> Any attempt to use printf() within this period will cause a hang.
>
> To fix this, mark the serial devices as 'unavailable' when it is no-longer
> available. Bring it back when serial_initialize() is called. This means that
> the debug UART will be used instead for this period.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v2:
> - Simplify the code in serial_initialize()
>
>  common/board_f.c               | 7 +++++++
>  drivers/serial/serial-uclass.c | 2 +-
>  2 files changed, 8 insertions(+), 1 deletion(-)
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>