Serieal console on Samsung S3C6410 ARM11 CPU (Was [ANNOUNCE] 3.0.6-rt17)

[Thomas Abraham]

Hi Juergen,

On 8 October 2011 16:56, Juergen Beisert <jbe at pengutronix.de> wrote:
> Thomas Gleixner wrote:
>> I'm pleased to announce the 3.0.6-rt17 release.
>
> I have no idea where to search, but when I'm using the 3.0.6-rt17 on my
> Samsung S3C6410 ARM based system, the UART (serial console) does not work as
> expected. Typing only one char at a time is okay. Typing two chars
> immediately makes the system using 100 % CPU load and takes about 2 seconds
> to respond. It seems the interrupt handling is broken in the UART driver, but
> I don't know how to fix it.
>
> This with a simple cursor up (one char to get the last command) and a small
> pause to the next "ENTER" char:
>
> root at mini6410:~ cat /proc/interrupts | grep 18:
>  18:    5739107  s3c-uart  s3c6400-uart
>
> Same again:
>
> root at mini6410:~ cat /proc/interrupts | grep 18:
>  18:    5739113  s3c-uart  s3c6400-uart
>
> 6 interrupts seems reasonable.
>
> Now with cursor up and SPACE immediately, then a pause for ENTER:
>
> root at mini6410:~ cat /proc/interrupts | grep 18:
>  18:    5923815  s3c-uart  s3c6400-uart
>
> 184702 interrupts looks strange.

Just curious, do you have the following two commits?

serial: samsung: Add unified interrupt handler for s3c64xx and later SoC's
ARM: SAMSUNG: Remove uart irq handling from platform code

Thanks,
Thomas.