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    SubjectRe: Serieal console on Samsung S3C6410 ARM11 CPU (Was [ANNOUNCE] 3.0.6-rt17)
    Date
    Hi Thomas,

    Thomas Abraham wrote:
    > On 8 October 2011 16:56, Juergen Beisert <jbe@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@mini6410:~ cat /proc/interrupts | grep 18:
    > >  18:    5739107  s3c-uart  s3c6400-uart
    > >
    > > Same again:
    > >
    > > root@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@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

    Are they part of the current 3.0.6 vanilla kernel? I'm only using the vanilla
    3.0.6 with rt17 on my target.

    jbe

    --
    Pengutronix e.K. | Juergen Beisert |
    Linux Solutions for Science and Industry | http://www.pengutronix.de/ |
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