linux-kernel - Re: Long stalls during boot with -next

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Message-ID: <CAJuYYwTeAwZ-zRDyQwB73bHWn+NkoT2zxmuJkFW6Oph1CUijqA@mail.gmail.com>
Date:	Fri, 7 Oct 2011 18:57:19 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: Long stalls during boot with -next

Hi Mark,

On 7 October 2011 17:20, Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:
> On Thu, Sep 29, 2011 at 01:50:36PM +0100, Mark Brown wrote:
>> Since Tuesday I've been experiencing stalls on boot with -next kernels.
>> The boot appears to proceed normally but there appears to be a good ten
>> second delay somewhere around the late_initcall() stage with no
>> indication in the logs:
>
> I identified the problem here, the behaviour of LL_DEBUG was changed to
> make it select DEBUG_ICEDCC by default which is unfortunate if one
> doesn't have an EmbeddedICE connected.

Thanks for your suggestion. The long stall during boot problem occurs
on Samsung boards as well with linux-next. As per your suggestion, the
following diff fixes this issue.

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 65cf8c6..035f5cd 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -120,6 +120,15 @@ choice
 		  Say Y here if you want the debug print routines to direct
 		  their output to the second serial port on these devices.

+	config DEBUG_SAMSUNG_UART
+		bool "Kernel low-level debugging messages via samsung serial port"
+		depends on PLAT_SAMSUNG
+		help
+		  Say Y here if you want the debug print routines to direct
+		  their output to the serial port for Samsung platforms. Choose
+		  the uart port with the "S3C UART to use for low-level debug"
+		  config option.
+
 endchoice

 config EARLY_PRINTK
@@ -139,7 +148,7 @@ config OC_ETM
 	  kernel code.

 config DEBUG_S3C_UART
-	depends on PLAT_SAMSUNG
+	depends on DEBUG_SAMSUNG_UART
 	int "S3C UART to use for low-level debug"
 	default "0"
 	help


Thanks,
Thomas.
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