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

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Message-ID: <CAJuYYwSB7CT=gyJTBcp4hrAR=Qwon=TzudR7ptA0kr+6RwCMFQ@mail.gmail.com>
Date:	Sun, 9 Oct 2011 00:31:55 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Juergen Beisert <jbe@...gutronix.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Serieal console on Samsung S3C6410 ARM11 CPU (Was [ANNOUNCE] 3.0.6-rt17)

On 8 October 2011 23:45, Juergen Beisert <jbe@...gutronix.de> wrote:
> Hi Thomas,
>
> Thomas Abraham wrote:
>> On 8 October 2011 16:56, Juergen Beisert <jbe@...gutronix.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@...i6410:~ cat /proc/interrupts | grep 18:
>> >  18:    5739107  s3c-uart  s3c6400-uart
>> >
>> > Same again:
>> >
>> > root@...i6410:~ 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@...i6410:~ 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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