at91: input overruns question

Uwe Kleine-König u.kleine-koenig at
Tue Oct 26 02:49:06 EDT 2010

Hello Aras,

On Tue, Oct 26, 2010 at 05:19:30PM +1100, Aras Vaichas wrote:
> I'm updating our production kernel to for an at91rm9200.
> This is the newest version supported by RT.
> I've noticed that the age-old debug serial input overrun(s) issue has
> gotten far worse and I can no longer use the cursor keys at all. i.e.
> no history on serial console or vi.
> As the kernel version numbers have gone up, the problem seems to have
> gotten worse.
> Is there anything that I can do to make it a bit more usable?
> Any .config changes?
> Is it worse because of the RT patches?
> Please feel free to point me to any previous posts discussing the
> issue, or solutions.
Where does the warning come from?  serial layer, at91 serial driver?
How big is the fifo in the at91 serial device?

Best regards

Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 |  |

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