[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Thomas Abraham]

Add a minimal board dts file for Samsung Exynos4412 based SMDK board.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
---
This patch depends the on the following patch posted by Tomasz Figa.
"ARM: dts: exynos4: Add support for Exynos4x12 SoCs"

 arch/arm/boot/dts/Makefile                |    1 +
 arch/arm/boot/dts/exynos4412-smdk4412.dts |   45 +++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index f37cf9f..36488a5 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
 dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
 	exynos4210-smdkv310.dtb \
 	exynos4210-trats.dtb \
+	exynos4412-smdk4412.dtb \
 	exynos5250-smdk5250.dtb
 dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
 dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts b/arch/arm/boot/dts/exynos4412-smdk4412.dts
new file mode 100644
index 0000000..f05bf57
--- /dev/null
+++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
@@ -0,0 +1,45 @@
+/*
+ * Samsung's Exynos4412 based SMDK board device tree source
+ *
+ * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Device tree source file for Samsung's SMDK4412 board which is based on
+ * Samsung's Exynos4412 SoC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+/dts-v1/;
+/include/ "exynos4412.dtsi"
+
+/ {
+	model = "Samsung SMDK evaluation board based on Exynos4412";
+	compatible = "samsung,smdk4412", "samsung,exynos4412";
+
+	memory {
+		reg = <0x40000000 0x40000000>;
+	};
+
+	chosen {
+		bootargs ="root=/dev/ram0 rw ramdisk=8192 initrd=0x41000000,8M console=ttySAC1,115200 init=/linuxrc";
+	};
+
+	serial at 13800000 {
+		status = "okay";
+	};
+
+	serial at 13810000 {
+		status = "okay";
+	};
+
+	serial at 13820000 {
+		status = "okay";
+	};
+
+	serial at 13830000 {
+		status = "okay";
+	};
+};
-- 
1.6.6.rc2

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Kukjin Kim]

Thomas Abraham wrote:
> 
> Add a minimal board dts file for Samsung Exynos4412 based SMDK board.
> 
> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> ---
> This patch depends the on the following patch posted by Tomasz Figa.
> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
> 
>  arch/arm/boot/dts/Makefile                |    1 +
>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
> +++++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index f37cf9f..36488a5 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
>  	exynos4210-smdkv310.dtb \
>  	exynos4210-trats.dtb \
> +	exynos4412-smdk4412.dtb \
>  	exynos5250-smdk5250.dtb
>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
> b/arch/arm/boot/dts/exynos4412-smdk4412.dts
> new file mode 100644
> index 0000000..f05bf57
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
> @@ -0,0 +1,45 @@
> +/*
> + * Samsung's Exynos4412 based SMDK board device tree source
> + *
> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * Device tree source file for Samsung's SMDK4412 board which is based on
> + * Samsung's Exynos4412 SoC.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> +*/
> +
> +/dts-v1/;
> +/include/ "exynos4412.dtsi"
> +
> +/ {
> +	model = "Samsung SMDK evaluation board based on Exynos4412";
> +	compatible = "samsung,smdk4412", "samsung,exynos4412";
> +
> +	memory {
> +		reg = <0x40000000 0x40000000>;
> +	};
> +
> +	chosen {
> +		bootargs ="root=/dev/ram0 rw ramdisk=8192
> initrd=0x41000000,8M console=ttySAC1,115200 init=/linuxrc";
> +	};
> +
> +	serial at 13800000 {
> +		status = "okay";
> +	};
> +
> +	serial at 13810000 {
> +		status = "okay";
> +	};
> +
> +	serial at 13820000 {
> +		status = "okay";
> +	};
> +
> +	serial at 13830000 {
> +		status = "okay";
> +	};
> +};
> --
> 1.6.6.rc2

Looks good to me, will apply.

BTW, its default console is ttySAC1 not ttySAC2?

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Tomasz Figa]

Hi Thomas,

On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
> Add a minimal board dts file for Samsung Exynos4412 based SMDK board.
> 
> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> ---
> This patch depends the on the following patch posted by Tomasz Figa.
> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
> 
>  arch/arm/boot/dts/Makefile                |    1 +
>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 0
> deletions(-)
>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index f37cf9f..36488a5 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
>  	exynos4210-smdkv310.dtb \
>  	exynos4210-trats.dtb \
> +	exynos4412-smdk4412.dtb \
>  	exynos5250-smdk5250.dtb
>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
> index 0000000..f05bf57
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
> @@ -0,0 +1,45 @@
> +/*
> + * Samsung's Exynos4412 based SMDK board device tree source
> + *
> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * Device tree source file for Samsung's SMDK4412 board which is based
> on + * Samsung's Exynos4412 SoC.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as +
> * published by the Free Software Foundation.
> +*/
> +
> +/dts-v1/;
> +/include/ "exynos4412.dtsi"
> +
> +/ {
> +	model = "Samsung SMDK evaluation board based on Exynos4412";
> +	compatible = "samsung,smdk4412", "samsung,exynos4412";
> +
> +	memory {
> +		reg = <0x40000000 0x40000000>;
> +	};

This will not boot, because section size limit is set to 256 MiB.

It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because the memory 
configuration from DT is ignored and values from ATAGs are taken instead.

I suggest you to change it to 4 banks of 256 MiB.

> +	chosen {
> +		bootargs ="root=/dev/ram0 rw ramdisk=8192 initrd=0x41000000,8M
> console=ttySAC1,115200 init=/linuxrc"; +	};
> +
> +	serial at 13800000 {
> +		status = "okay";
> +	};
> +
> +	serial at 13810000 {
> +		status = "okay";
> +	};
> +
> +	serial at 13820000 {
> +		status = "okay";
> +	};
> +
> +	serial at 13830000 {
> +		status = "okay";
> +	};
> +};

Otherwise looks fine.

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center
SW Solution Development, Linux Platform

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Thomas Abraham]

On 6 November 2012 16:58, Kukjin Kim <kgene.kim@samsung.com> wrote:
> Thomas Abraham wrote:
>>
>> Add a minimal board dts file for Samsung Exynos4412 based SMDK board.
>>
>> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
>> ---
>> This patch depends the on the following patch posted by Tomasz Figa.
>> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
>>
>>  arch/arm/boot/dts/Makefile                |    1 +
>>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
>> +++++++++++++++++++++++++++++
>>  2 files changed, 46 insertions(+), 0 deletions(-)
>>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
>>
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index f37cf9f..36488a5 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
>>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
>>       exynos4210-smdkv310.dtb \
>>       exynos4210-trats.dtb \
>> +     exynos4412-smdk4412.dtb \
>>       exynos5250-smdk5250.dtb
>>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
>>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
>> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> b/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> new file mode 100644
>> index 0000000..f05bf57
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> @@ -0,0 +1,45 @@
>> +/*
>> + * Samsung's Exynos4412 based SMDK board device tree source
>> + *
>> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
>> + *           http://www.samsung.com
>> + *
>> + * Device tree source file for Samsung's SMDK4412 board which is based on
>> + * Samsung's Exynos4412 SoC.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> +*/
>> +
>> +/dts-v1/;
>> +/include/ "exynos4412.dtsi"
>> +
>> +/ {
>> +     model = "Samsung SMDK evaluation board based on Exynos4412";
>> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
>> +
>> +     memory {
>> +             reg = <0x40000000 0x40000000>;
>> +     };
>> +
>> +     chosen {
>> +             bootargs ="root=/dev/ram0 rw ramdisk=8192
>> initrd=0x41000000,8M console=ttySAC1,115200 init=/linuxrc";
>> +     };
>> +
>> +     serial at 13800000 {
>> +             status = "okay";
>> +     };
>> +
>> +     serial at 13810000 {
>> +             status = "okay";
>> +     };
>> +
>> +     serial at 13820000 {
>> +             status = "okay";
>> +     };
>> +
>> +     serial at 13830000 {
>> +             status = "okay";
>> +     };
>> +};
>> --
>> 1.6.6.rc2
>
> Looks good to me, will apply.
>
> BTW, its default console is ttySAC1 not ttySAC2?

Thanks Mr. Kim. There is support for both ttySAC1 and ttySAC2 as uart
ports. There are corresponding switches on the board that have to be
set. But the default setting is always to use ttySAC1.

Thanks,
Thomas.

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Thomas Abraham]

Hi Tomasz,

Thanks for your comments.

On 12 November 2012 19:37, Tomasz Figa <t.figa@samsung.com> wrote:
> Hi Thomas,
>
> On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
>> Add a minimal board dts file for Samsung Exynos4412 based SMDK board.
>>
>> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
>> ---
>> This patch depends the on the following patch posted by Tomasz Figa.
>> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
>>
>>  arch/arm/boot/dts/Makefile                |    1 +
>>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
>> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 0
>> deletions(-)
>>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
>>
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index f37cf9f..36488a5 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
>>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
>>       exynos4210-smdkv310.dtb \
>>       exynos4210-trats.dtb \
>> +     exynos4412-smdk4412.dtb \
>>       exynos5250-smdk5250.dtb
>>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
>>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
>> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
>> index 0000000..f05bf57
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> @@ -0,0 +1,45 @@
>> +/*
>> + * Samsung's Exynos4412 based SMDK board device tree source
>> + *
>> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
>> + *           http://www.samsung.com
>> + *
>> + * Device tree source file for Samsung's SMDK4412 board which is based
>> on + * Samsung's Exynos4412 SoC.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as +
>> * published by the Free Software Foundation.
>> +*/
>> +
>> +/dts-v1/;
>> +/include/ "exynos4412.dtsi"
>> +
>> +/ {
>> +     model = "Samsung SMDK evaluation board based on Exynos4412";
>> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
>> +
>> +     memory {
>> +             reg = <0x40000000 0x40000000>;
>> +     };
>
> This will not boot, because section size limit is set to 256 MiB.
>
> It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because the memory
> configuration from DT is ignored and values from ATAGs are taken instead.
>
> I suggest you to change it to 4 banks of 256 MiB.

Thanks for pointing this out. So are there any existing exynos based
platforms that use sparse mem? If not, we should probably remove the
section length configuration itself for mach-exynos. I suspect this
setting might not help with the single kernel image support as well.

Thanks,
Thomas.

>
>> +     chosen {
>> +             bootargs ="root=/dev/ram0 rw ramdisk=8192 initrd=0x41000000,8M
>> console=ttySAC1,115200 init=/linuxrc"; +      };
>> +
>> +     serial at 13800000 {
>> +             status = "okay";
>> +     };
>> +
>> +     serial at 13810000 {
>> +             status = "okay";
>> +     };
>> +
>> +     serial at 13820000 {
>> +             status = "okay";
>> +     };
>> +
>> +     serial at 13830000 {
>> +             status = "okay";
>> +     };
>> +};
>
> Otherwise looks fine.
>
> Best regards,
> --
> Tomasz Figa
> Samsung Poland R&D Center
> SW Solution Development, Linux Platform
>

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Tomasz Figa]

On Thursday 15 of November 2012 13:48:55 Thomas Abraham wrote:
> Hi Tomasz,
> 
> Thanks for your comments.
> 
> On 12 November 2012 19:37, Tomasz Figa <t.figa@samsung.com> wrote:
> > Hi Thomas,
> > 
> > On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
> >> Add a minimal board dts file for Samsung Exynos4412 based SMDK board.
> >> 
> >> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> >> ---
> >> This patch depends the on the following patch posted by Tomasz Figa.
> >> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
> >> 
> >>  arch/arm/boot/dts/Makefile                |    1 +
> >>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
> >> 
> >> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 0
> >> deletions(-)
> >> 
> >>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> 
> >> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> >> index f37cf9f..36488a5 100644
> >> --- a/arch/arm/boot/dts/Makefile
> >> +++ b/arch/arm/boot/dts/Makefile
> >> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
> >> 
> >>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
> >>  
> >>       exynos4210-smdkv310.dtb \
> >>       exynos4210-trats.dtb \
> >> 
> >> +     exynos4412-smdk4412.dtb \
> >> 
> >>       exynos5250-smdk5250.dtb
> >>  
> >>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
> >>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
> >> 
> >> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
> >> index 0000000..f05bf57
> >> --- /dev/null
> >> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> @@ -0,0 +1,45 @@
> >> +/*
> >> + * Samsung's Exynos4412 based SMDK board device tree source
> >> + *
> >> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> >> + *           http://www.samsung.com
> >> + *
> >> + * Device tree source file for Samsung's SMDK4412 board which is
> >> based
> >> on + * Samsung's Exynos4412 SoC.
> >> + *
> >> + * This program is free software; you can redistribute it and/or
> >> modify + * it under the terms of the GNU General Public License
> >> version 2 as + * published by the Free Software Foundation.
> >> +*/
> >> +
> >> +/dts-v1/;
> >> +/include/ "exynos4412.dtsi"
> >> +
> >> +/ {
> >> +     model = "Samsung SMDK evaluation board based on Exynos4412";
> >> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
> >> +
> >> +     memory {
> >> +             reg = <0x40000000 0x40000000>;
> >> +     };
> > 
> > This will not boot, because section size limit is set to 256 MiB.
> > 
> > It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because the
> > memory configuration from DT is ignored and values from ATAGs are
> > taken instead.
> > 
> > I suggest you to change it to 4 banks of 256 MiB.
> 
> Thanks for pointing this out. So are there any existing exynos based
> platforms that use sparse mem? If not, we should probably remove the
> section length configuration itself for mach-exynos. I suspect this
> setting might not help with the single kernel image support as well.

Isn't sparse memory the only configuration available for ARCH_EXYNOS?

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center
SW Solution Development, Linux Platform

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Thomas Abraham]

On 16 November 2012 16:41, Tomasz Figa <t.figa@samsung.com> wrote:
> On Thursday 15 of November 2012 13:48:55 Thomas Abraham wrote:
>> Hi Tomasz,
>>
>> Thanks for your comments.
>>
>> On 12 November 2012 19:37, Tomasz Figa <t.figa@samsung.com> wrote:
>> > Hi Thomas,
>> >
>> > On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
>> >> Add a minimal board dts file for Samsung Exynos4412 based SMDK board.
>> >>
>> >> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
>> >> ---
>> >> This patch depends the on the following patch posted by Tomasz Figa.
>> >> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
>> >>
>> >>  arch/arm/boot/dts/Makefile                |    1 +
>> >>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
>> >>
>> >> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 0
>> >> deletions(-)
>> >>
>> >>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
>> >>
>> >> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> >> index f37cf9f..36488a5 100644
>> >> --- a/arch/arm/boot/dts/Makefile
>> >> +++ b/arch/arm/boot/dts/Makefile
>> >> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
>> >>
>> >>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
>> >>
>> >>       exynos4210-smdkv310.dtb \
>> >>       exynos4210-trats.dtb \
>> >>
>> >> +     exynos4412-smdk4412.dtb \
>> >>
>> >>       exynos5250-smdk5250.dtb
>> >>
>> >>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
>> >>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
>> >>
>> >> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> >> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
>> >> index 0000000..f05bf57
>> >> --- /dev/null
>> >> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> >> @@ -0,0 +1,45 @@
>> >> +/*
>> >> + * Samsung's Exynos4412 based SMDK board device tree source
>> >> + *
>> >> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
>> >> + *           http://www.samsung.com
>> >> + *
>> >> + * Device tree source file for Samsung's SMDK4412 board which is
>> >> based
>> >> on + * Samsung's Exynos4412 SoC.
>> >> + *
>> >> + * This program is free software; you can redistribute it and/or
>> >> modify + * it under the terms of the GNU General Public License
>> >> version 2 as + * published by the Free Software Foundation.
>> >> +*/
>> >> +
>> >> +/dts-v1/;
>> >> +/include/ "exynos4412.dtsi"
>> >> +
>> >> +/ {
>> >> +     model = "Samsung SMDK evaluation board based on Exynos4412";
>> >> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
>> >> +
>> >> +     memory {
>> >> +             reg = <0x40000000 0x40000000>;
>> >> +     };
>> >
>> > This will not boot, because section size limit is set to 256 MiB.
>> >
>> > It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because the
>> > memory configuration from DT is ignored and values from ATAGs are
>> > taken instead.
>> >
>> > I suggest you to change it to 4 banks of 256 MiB.
>>
>> Thanks for pointing this out. So are there any existing exynos based
>> platforms that use sparse mem? If not, we should probably remove the
>> section length configuration itself for mach-exynos. I suspect this
>> setting might not help with the single kernel image support as well.
>
> Isn't sparse memory the only configuration available for ARCH_EXYNOS?

Yes, true. Since sparsemem is choosen as default for Exynos, flatmem
option is not available. Theoretically, sparsemem could be used on
Exynos platforms, but if all existing exynos4/5 based boards have no
holes in memory, then why not use flatmem instead? If there are
performance benefits of using flatmem over sparesmem on systems
without any memory holes, then it is a compelling reason to stop using
sparsemem on Exynos. But then, what if there is a new Exynos4/5 based
board that comes up and that has a memory hole? Or, how about removing
sparsemem as default option for ARCH_EXYNOS and enabling sparsemem for
boards that need it.

Thanks,
Thomas.

>
> Best regards,
> --
> Tomasz Figa
> Samsung Poland R&D Center
> SW Solution Development, Linux Platform
>

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Tomasz Figa]

On Friday 16 of November 2012 18:03:15 Thomas Abraham wrote:
> On 16 November 2012 16:41, Tomasz Figa <t.figa@samsung.com> wrote:
> > On Thursday 15 of November 2012 13:48:55 Thomas Abraham wrote:
> >> Hi Tomasz,
> >> 
> >> Thanks for your comments.
> >> 
> >> On 12 November 2012 19:37, Tomasz Figa <t.figa@samsung.com> wrote:
> >> > Hi Thomas,
> >> > 
> >> > On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
> >> >> Add a minimal board dts file for Samsung Exynos4412 based SMDK
> >> >> board.
> >> >> 
> >> >> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> >> >> ---
> >> >> This patch depends the on the following patch posted by Tomasz
> >> >> Figa.
> >> >> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
> >> >> 
> >> >>  arch/arm/boot/dts/Makefile                |    1 +
> >> >>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
> >> >> 
> >> >> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 0
> >> >> deletions(-)
> >> >> 
> >> >>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> >> 
> >> >> diff --git a/arch/arm/boot/dts/Makefile
> >> >> b/arch/arm/boot/dts/Makefile
> >> >> index f37cf9f..36488a5 100644
> >> >> --- a/arch/arm/boot/dts/Makefile
> >> >> +++ b/arch/arm/boot/dts/Makefile
> >> >> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
> >> >> 
> >> >>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
> >> >>  
> >> >>       exynos4210-smdkv310.dtb \
> >> >>       exynos4210-trats.dtb \
> >> >> 
> >> >> +     exynos4412-smdk4412.dtb \
> >> >> 
> >> >>       exynos5250-smdk5250.dtb
> >> >>  
> >> >>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
> >> >>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
> >> >> 
> >> >> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> >> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
> >> >> index 0000000..f05bf57
> >> >> --- /dev/null
> >> >> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> >> @@ -0,0 +1,45 @@
> >> >> +/*
> >> >> + * Samsung's Exynos4412 based SMDK board device tree source
> >> >> + *
> >> >> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> >> >> + *           http://www.samsung.com
> >> >> + *
> >> >> + * Device tree source file for Samsung's SMDK4412 board which is
> >> >> based
> >> >> on + * Samsung's Exynos4412 SoC.
> >> >> + *
> >> >> + * This program is free software; you can redistribute it and/or
> >> >> modify + * it under the terms of the GNU General Public License
> >> >> version 2 as + * published by the Free Software Foundation.
> >> >> +*/
> >> >> +
> >> >> +/dts-v1/;
> >> >> +/include/ "exynos4412.dtsi"
> >> >> +
> >> >> +/ {
> >> >> +     model = "Samsung SMDK evaluation board based on Exynos4412";
> >> >> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
> >> >> +
> >> >> +     memory {
> >> >> +             reg = <0x40000000 0x40000000>;
> >> >> +     };
> >> > 
> >> > This will not boot, because section size limit is set to 256 MiB.
> >> > 
> >> > It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because the
> >> > memory configuration from DT is ignored and values from ATAGs are
> >> > taken instead.
> >> > 
> >> > I suggest you to change it to 4 banks of 256 MiB.
> >> 
> >> Thanks for pointing this out. So are there any existing exynos based
> >> platforms that use sparse mem? If not, we should probably remove the
> >> section length configuration itself for mach-exynos. I suspect this
> >> setting might not help with the single kernel image support as well.
> > 
> > Isn't sparse memory the only configuration available for ARCH_EXYNOS?
> 
> Yes, true. Since sparsemem is choosen as default for Exynos, flatmem
> option is not available. Theoretically, sparsemem could be used on
> Exynos platforms, but if all existing exynos4/5 based boards have no
> holes in memory, then why not use flatmem instead? If there are
> performance benefits of using flatmem over sparesmem on systems
> without any memory holes, then it is a compelling reason to stop using
> sparsemem on Exynos. But then, what if there is a new Exynos4/5 based
> board that comes up and that has a memory hole? Or, how about removing
> sparsemem as default option for ARCH_EXYNOS and enabling sparsemem for
> boards that need it.

I'm not sure about any significant performance benefits of FLATMEM over 
SPARSEMEM. Some ancient benchmark from 2007 shows that overhead level of 
both is similar.

You can find the benchmark here: 
http://lkml.indiana.edu/hypermail/linux/kernel/0711.1/1239.html

I think we should leave it as is for the time being and just make sure 
that sections of boards are defined according to section size limit.

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center
SW Solution Development, Linux Platform

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Thomas Abraham]

On 16 November 2012 18:28, Tomasz Figa <t.figa@samsung.com> wrote:
> On Friday 16 of November 2012 18:03:15 Thomas Abraham wrote:
>> On 16 November 2012 16:41, Tomasz Figa <t.figa@samsung.com> wrote:
>> > On Thursday 15 of November 2012 13:48:55 Thomas Abraham wrote:
>> >> Hi Tomasz,
>> >>
>> >> Thanks for your comments.
>> >>
>> >> On 12 November 2012 19:37, Tomasz Figa <t.figa@samsung.com> wrote:
>> >> > Hi Thomas,
>> >> >
>> >> > On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
>> >> >> Add a minimal board dts file for Samsung Exynos4412 based SMDK
>> >> >> board.
>> >> >>
>> >> >> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
>> >> >> ---
>> >> >> This patch depends the on the following patch posted by Tomasz
>> >> >> Figa.
>> >> >> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
>> >> >>
>> >> >>  arch/arm/boot/dts/Makefile                |    1 +
>> >> >>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
>> >> >>
>> >> >> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 0
>> >> >> deletions(-)
>> >> >>
>> >> >>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
>> >> >>
>> >> >> diff --git a/arch/arm/boot/dts/Makefile
>> >> >> b/arch/arm/boot/dts/Makefile
>> >> >> index f37cf9f..36488a5 100644
>> >> >> --- a/arch/arm/boot/dts/Makefile
>> >> >> +++ b/arch/arm/boot/dts/Makefile
>> >> >> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
>> >> >>
>> >> >>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
>> >> >>
>> >> >>       exynos4210-smdkv310.dtb \
>> >> >>       exynos4210-trats.dtb \
>> >> >>
>> >> >> +     exynos4412-smdk4412.dtb \
>> >> >>
>> >> >>       exynos5250-smdk5250.dtb
>> >> >>
>> >> >>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
>> >> >>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
>> >> >>
>> >> >> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> >> >> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
>> >> >> index 0000000..f05bf57
>> >> >> --- /dev/null
>> >> >> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
>> >> >> @@ -0,0 +1,45 @@
>> >> >> +/*
>> >> >> + * Samsung's Exynos4412 based SMDK board device tree source
>> >> >> + *
>> >> >> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
>> >> >> + *           http://www.samsung.com
>> >> >> + *
>> >> >> + * Device tree source file for Samsung's SMDK4412 board which is
>> >> >> based
>> >> >> on + * Samsung's Exynos4412 SoC.
>> >> >> + *
>> >> >> + * This program is free software; you can redistribute it and/or
>> >> >> modify + * it under the terms of the GNU General Public License
>> >> >> version 2 as + * published by the Free Software Foundation.
>> >> >> +*/
>> >> >> +
>> >> >> +/dts-v1/;
>> >> >> +/include/ "exynos4412.dtsi"
>> >> >> +
>> >> >> +/ {
>> >> >> +     model = "Samsung SMDK evaluation board based on Exynos4412";
>> >> >> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
>> >> >> +
>> >> >> +     memory {
>> >> >> +             reg = <0x40000000 0x40000000>;
>> >> >> +     };
>> >> >
>> >> > This will not boot, because section size limit is set to 256 MiB.
>> >> >
>> >> > It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because the
>> >> > memory configuration from DT is ignored and values from ATAGs are
>> >> > taken instead.
>> >> >
>> >> > I suggest you to change it to 4 banks of 256 MiB.
>> >>
>> >> Thanks for pointing this out. So are there any existing exynos based
>> >> platforms that use sparse mem? If not, we should probably remove the
>> >> section length configuration itself for mach-exynos. I suspect this
>> >> setting might not help with the single kernel image support as well.
>> >
>> > Isn't sparse memory the only configuration available for ARCH_EXYNOS?
>>
>> Yes, true. Since sparsemem is choosen as default for Exynos, flatmem
>> option is not available. Theoretically, sparsemem could be used on
>> Exynos platforms, but if all existing exynos4/5 based boards have no
>> holes in memory, then why not use flatmem instead? If there are
>> performance benefits of using flatmem over sparesmem on systems
>> without any memory holes, then it is a compelling reason to stop using
>> sparsemem on Exynos. But then, what if there is a new Exynos4/5 based
>> board that comes up and that has a memory hole? Or, how about removing
>> sparsemem as default option for ARCH_EXYNOS and enabling sparsemem for
>> boards that need it.
>
> I'm not sure about any significant performance benefits of FLATMEM over
> SPARSEMEM. Some ancient benchmark from 2007 shows that overhead level of
> both is similar.
>
> You can find the benchmark here:
> http://lkml.indiana.edu/hypermail/linux/kernel/0711.1/1239.html
>
> I think we should leave it as is for the time being and just make sure
> that sections of boards are defined according to section size limit.

Ok, makes sense. Thanks. By the way, I was checking why this patch did
not lead me to a crash as you described. u-boot seems to be overriding
the memory node in the dts file and creating a new memory node with
the memory banks information that u-boot has. So looking at
/proc/device-tree/memory/reg, there are multiple 256MB sized entries
there.

Regards,
Thomas.

[PATCH] ARM: dts: add board dts file for Exynos4412 based SMDK board

[Tomasz Figa]

On Friday 16 of November 2012 18:47:54 Thomas Abraham wrote:
> On 16 November 2012 18:28, Tomasz Figa <t.figa@samsung.com> wrote:
> > On Friday 16 of November 2012 18:03:15 Thomas Abraham wrote:
> >> On 16 November 2012 16:41, Tomasz Figa <t.figa@samsung.com> wrote:
> >> > On Thursday 15 of November 2012 13:48:55 Thomas Abraham wrote:
> >> >> Hi Tomasz,
> >> >> 
> >> >> Thanks for your comments.
> >> >> 
> >> >> On 12 November 2012 19:37, Tomasz Figa <t.figa@samsung.com> wrote:
> >> >> > Hi Thomas,
> >> >> > 
> >> >> > On Saturday 03 of November 2012 20:19:32 Thomas Abraham wrote:
> >> >> >> Add a minimal board dts file for Samsung Exynos4412 based SMDK
> >> >> >> board.
> >> >> >> 
> >> >> >> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> >> >> >> ---
> >> >> >> This patch depends the on the following patch posted by Tomasz
> >> >> >> Figa.
> >> >> >> "ARM: dts: exynos4: Add support for Exynos4x12 SoCs"
> >> >> >> 
> >> >> >>  arch/arm/boot/dts/Makefile                |    1 +
> >> >> >>  arch/arm/boot/dts/exynos4412-smdk4412.dts |   45
> >> >> >> 
> >> >> >> +++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+),
> >> >> >> 0
> >> >> >> deletions(-)
> >> >> >> 
> >> >> >>  create mode 100644 arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> >> >> 
> >> >> >> diff --git a/arch/arm/boot/dts/Makefile
> >> >> >> b/arch/arm/boot/dts/Makefile
> >> >> >> index f37cf9f..36488a5 100644
> >> >> >> --- a/arch/arm/boot/dts/Makefile
> >> >> >> +++ b/arch/arm/boot/dts/Makefile
> >> >> >> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
> >> >> >> 
> >> >> >>  dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
> >> >> >>  
> >> >> >>       exynos4210-smdkv310.dtb \
> >> >> >>       exynos4210-trats.dtb \
> >> >> >> 
> >> >> >> +     exynos4412-smdk4412.dtb \
> >> >> >> 
> >> >> >>       exynos5250-smdk5250.dtb
> >> >> >>  
> >> >> >>  dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
> >> >> >>  dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
> >> >> >> 
> >> >> >> diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> >> >> b/arch/arm/boot/dts/exynos4412-smdk4412.dts new file mode 100644
> >> >> >> index 0000000..f05bf57
> >> >> >> --- /dev/null
> >> >> >> +++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
> >> >> >> @@ -0,0 +1,45 @@
> >> >> >> +/*
> >> >> >> + * Samsung's Exynos4412 based SMDK board device tree source
> >> >> >> + *
> >> >> >> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> >> >> >> + *           http://www.samsung.com
> >> >> >> + *
> >> >> >> + * Device tree source file for Samsung's SMDK4412 board which
> >> >> >> is
> >> >> >> based
> >> >> >> on + * Samsung's Exynos4412 SoC.
> >> >> >> + *
> >> >> >> + * This program is free software; you can redistribute it
> >> >> >> and/or
> >> >> >> modify + * it under the terms of the GNU General Public License
> >> >> >> version 2 as + * published by the Free Software Foundation.
> >> >> >> +*/
> >> >> >> +
> >> >> >> +/dts-v1/;
> >> >> >> +/include/ "exynos4412.dtsi"
> >> >> >> +
> >> >> >> +/ {
> >> >> >> +     model = "Samsung SMDK evaluation board based on
> >> >> >> Exynos4412";
> >> >> >> +     compatible = "samsung,smdk4412", "samsung,exynos4412";
> >> >> >> +
> >> >> >> +     memory {
> >> >> >> +             reg = <0x40000000 0x40000000>;
> >> >> >> +     };
> >> >> > 
> >> >> > This will not boot, because section size limit is set to 256 MiB.
> >> >> > 
> >> >> > It might work with CONFIG_ARM_ATAG_DTB_COMPAT enabled, because
> >> >> > the
> >> >> > memory configuration from DT is ignored and values from ATAGs are
> >> >> > taken instead.
> >> >> > 
> >> >> > I suggest you to change it to 4 banks of 256 MiB.
> >> >> 
> >> >> Thanks for pointing this out. So are there any existing exynos
> >> >> based
> >> >> platforms that use sparse mem? If not, we should probably remove
> >> >> the
> >> >> section length configuration itself for mach-exynos. I suspect this
> >> >> setting might not help with the single kernel image support as
> >> >> well.
> >> > 
> >> > Isn't sparse memory the only configuration available for
> >> > ARCH_EXYNOS?
> >> 
> >> Yes, true. Since sparsemem is choosen as default for Exynos, flatmem
> >> option is not available. Theoretically, sparsemem could be used on
> >> Exynos platforms, but if all existing exynos4/5 based boards have no
> >> holes in memory, then why not use flatmem instead? If there are
> >> performance benefits of using flatmem over sparesmem on systems
> >> without any memory holes, then it is a compelling reason to stop using
> >> sparsemem on Exynos. But then, what if there is a new Exynos4/5 based
> >> board that comes up and that has a memory hole? Or, how about removing
> >> sparsemem as default option for ARCH_EXYNOS and enabling sparsemem for
> >> boards that need it.
> > 
> > I'm not sure about any significant performance benefits of FLATMEM over
> > SPARSEMEM. Some ancient benchmark from 2007 shows that overhead level
> > of
> > both is similar.
> > 
> > You can find the benchmark here:
> > http://lkml.indiana.edu/hypermail/linux/kernel/0711.1/1239.html
> > 
> > I think we should leave it as is for the time being and just make sure
> > that sections of boards are defined according to section size limit.
> 
> Ok, makes sense. Thanks. By the way, I was checking why this patch did
> not lead me to a crash as you described. u-boot seems to be overriding
> the memory node in the dts file and creating a new memory node with
> the memory banks information that u-boot has. So looking at
> /proc/device-tree/memory/reg, there are multiple 256MB sized entries
> there.

OK, it seems like you are using a DT-aware u-boot. It can generate memory 
and chosen nodes, so I guess the behavior you observe is fine.

I'm testing on a legacy u-boot version without DT support, so all the 
information must be included in the appended DTB and so I observed boot 
crashes with too big sections.

Btw. It seems like Kgene has already applied your patch, so let's send a 
separate fixup patch. It can be considered a fix so there shouldn't be any 
problems with merging it. Should I send it or you will do it?

Best regards,
Tomasz Figa