[U-Boot] [RFC PATCH 2/2] serial_mxc: disable new features of autobaud detection

[Fabio Estevam]

On Wed, May 14, 2014 at 3:04 PM, Eric Nelson
<eric.nelson at boundarydevices.com> wrote:
> Bit 7 of UCR3 is described in the i.MX3x/i.MX5x/i.MX6x
> reference manuals as follows:
>
>         Autobaud Detection Not Improved-. Disables new features of
>         autobaud detection (See Baud Rate Automatic Detection
>         Protocol, for more details).
>
>         0 Autobaud detection new features selected
>         1 Keep old autobaud detection mechanism
>
> On at least i.MX6DQ, i.MX6DLS and i.MX53, the "new features"
> occasionally cause the receiver to get out of sync and
> continuously produce received characters of '\xff'.
>
> This patch disables the "new feature" on all boards, since
> there's no support for auto-baud in U-Boot on any of them.
>
> More details are available in this post on i.MX Community:
>         https://community.freescale.com/message/403254
>
> Signed-off-by: Eric Nelson <eric.nelson at boundarydevices.com>

Good job, Eric!

I was able to test it on mx6 and mx53 boards:

Tested-by: Fabio Estevam <fabio.estevam at freescale.com>