[U-Boot] [U-Boot, v2] serial: nulldev: Add nulldev serial driver

[Tom Rini]

On Thu, Aug 24, 2017 at 08:29:07PM -0700, Wilson Lee wrote:

> From: Keng Soon Cheah <keng.soon.cheah at ni.com>
> 
> Some device the serial console's initialization cannot run early during
> the boot process. Hence, nulldev serial device is helpful on that
> situation.
> 
> For example, if the serial module was implemented in FPGA. Serial
> initialization is prohibited to run until the FPGA was programmed.
> 
> This commit is to adding nulldev serial driver. This will allows the
> default console to be specified as a nulldev.
> 
> Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>
> Signed-off-by: Keng Soon Cheah <keng.soon.cheah at ni.com>
> Cc: Chen Yee Chew <chen.yee.chew at ni.com>

Applied to u-boot/master, thanks!

-- 
Tom
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