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    SubjectRe: Serieal console on Samsung S3C6410 ARM11 CPU (Was [ANNOUNCE] 3.0.6-rt17)
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    On 8 October 2011 23:45, Juergen Beisert <jbe@pengutronix.de> wrote:
    > 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.

    No. I don't think they are part of 3.0.6 kernel. I am not sure of the
    issue you have with serial console, but if you do not have these
    patches already applied, you could try with them.

    Thanks,
    Thomas.
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