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

On Wed, May 14, 2014 at 3:04 PM, Eric Nelson eric.nelson@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@boundarydevices.com

Good job, Eric!

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

Tested-by: Fabio Estevam fabio.estevam@freescale.com