Re: [PATCH v2] serial: 8250_dw: Improve unwritable LCR workaround

Tim Kryger
2013-11-28T02:46:28Z

On Wed, Nov 27, 2013 at 10:54 AM, Ezequiel Garcia
<ezequiel.garcia@free-electrons.com> wrote:
> On Tue, Nov 26, 2013 at 03:03:03PM -0800, Tim Kryger wrote:

>> An external device may be keeping the UART busy and preventing LCR
>> from being written.
>>
>> What device is attached to ttyS1?
>
> There's no device attached at ttyS1. I've just tested this in another
> box and it seems the same error is obtained on each unused port:

Do you know if your UART pins have pull up resistors?

If you can, try attaching something to an unused port.

-Tim