configs: add nitrogen6sx_defconfig for Boundary Devices SoloX board

This board is using the exact same kernel and u-boot revision as the
Nitrogen6x. They also share the same u-boot "autoboot" script.

The differences between the two configurations are:
- getty port is ttymxc0 instead of ttymxc1
- uImage load address is 0x80008000
- different device tree

http://boundarydevices.com/product/nit6_solox-imx6/

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
---
Hi all,

I didn't include this patch as part of the Freescale packages update
as it is an addition. However this patch depends on the updates to be
applied for graphics support and so on.
http://lists.busybox.net/pipermail/buildroot/2015-September/139278.html

I wish we could do an include of another defconfig, that'd simplify
future config updates as it could look like:

include nitrogen6x_defconfig
BR2_TARGET_GENERIC_GETTY_PORT="ttymxc0"
BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x80008000"
BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6sx-nitrogen6sx"

That would also be very useful for all the Freescale sabre boards
where every config is almost the same apart from uboot configuration
or device tree name.

Regards,
Gary
---
 configs/nitrogen6sx_defconfig | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 configs/nitrogen6sx_defconfig

Gary,

On Fri, 11 Sep 2015 12:00:09 +0200, Gary Bisson wrote:
> This board is using the exact same kernel and u-boot revision as the
> Nitrogen6x. They also share the same u-boot "autoboot" script.
> 
> The differences between the two configurations are:
> - getty port is ttymxc0 instead of ttymxc1
> - uImage load address is 0x80008000

Do you have a reason to keep using uImage instead of using zImage?
uImage are now a bit deprecated on ARM, and zImage is the modern way of
booting the kernel even from U-Boot (using the bootz command).

> I didn't include this patch as part of the Freescale packages update
> as it is an addition. However this patch depends on the updates to be
> applied for graphics support and so on.
> http://lists.busybox.net/pipermail/buildroot/2015-September/139278.html

No problem, I applied them already.

> I wish we could do an include of another defconfig, that'd simplify
> future config updates as it could look like:
> 
> include nitrogen6x_defconfig
> BR2_TARGET_GENERIC_GETTY_PORT="ttymxc0"
> BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x80008000"
> BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6sx-nitrogen6sx"
> 
> That would also be very useful for all the Freescale sabre boards
> where every config is almost the same apart from uboot configuration
> or device tree name.

Indeed. We don't have a solution for this in the upstream Buildroot.
However, people in this situation are encouraged to use the concept of
"defconfig" fragments, which can be merged together to give the final
defconfig.

I've applied your patch.

Thanks!

Thomas

Hi Thomas,

On Sat, Sep 19, 2015 at 3:34 PM, Thomas Petazzoni
<thomas.petazzoni@free-electrons.com> wrote:
> Gary,
>
> On Fri, 11 Sep 2015 12:00:09 +0200, Gary Bisson wrote:
>> This board is using the exact same kernel and u-boot revision as the
>> Nitrogen6x. They also share the same u-boot "autoboot" script.
>>
>> The differences between the two configurations are:
>> - getty port is ttymxc0 instead of ttymxc1
>> - uImage load address is 0x80008000
>
> Do you have a reason to keep using uImage instead of using zImage?
> uImage are now a bit deprecated on ARM, and zImage is the modern way of
> booting the kernel even from U-Boot (using the bootz command).

Legacy I guess. I should look into it but the main advantage I see of
bootm/uImage is the CRC check. What is the story behind the switch to
bootz?

>> I didn't include this patch as part of the Freescale packages update
>> as it is an addition. However this patch depends on the updates to be
>> applied for graphics support and so on.
>> http://lists.busybox.net/pipermail/buildroot/2015-September/139278.html
>
> No problem, I applied them already.
>
>> I wish we could do an include of another defconfig, that'd simplify
>> future config updates as it could look like:
>>
>> include nitrogen6x_defconfig
>> BR2_TARGET_GENERIC_GETTY_PORT="ttymxc0"
>> BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x80008000"
>> BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6sx-nitrogen6sx"
>>
>> That would also be very useful for all the Freescale sabre boards
>> where every config is almost the same apart from uboot configuration
>> or device tree name.
>
> Indeed. We don't have a solution for this in the upstream Buildroot.
> However, people in this situation are encouraged to use the concept of
> "defconfig" fragments, which can be merged together to give the final
> defconfig.

Ok, I'll into the fragments concept.

Thanks,
Gary

Hi Gary,

On Mon, Sep 21, 2015 at 06:19:03PM +0200, Gary Bisson wrote:
> On Sat, Sep 19, 2015 at 3:34 PM, Thomas Petazzoni
> <thomas.petazzoni@free-electrons.com> wrote:
> > On Fri, 11 Sep 2015 12:00:09 +0200, Gary Bisson wrote:
> >> This board is using the exact same kernel and u-boot revision as the
> >> Nitrogen6x. They also share the same u-boot "autoboot" script.
> >>
> >> The differences between the two configurations are:
> >> - getty port is ttymxc0 instead of ttymxc1
> >> - uImage load address is 0x80008000
> >
> > Do you have a reason to keep using uImage instead of using zImage?
> > uImage are now a bit deprecated on ARM, and zImage is the modern way of
> > booting the kernel even from U-Boot (using the bootz command).
> 
> Legacy I guess. I should look into it but the main advantage I see of
> bootm/uImage is the CRC check. What is the story behind the switch to
> bootz?

Multiplatform. See [1], for example.

[1] 
http://lists.infradead.org/pipermail/linux-arm-kernel/2011-September/066289.html

baruch

Hi Baruch,

On Mon, Sep 21, 2015 at 7:08 PM, Baruch Siach <baruch@tkos.co.il> wrote:
> Hi Gary,
>
> On Mon, Sep 21, 2015 at 06:19:03PM +0200, Gary Bisson wrote:
>> On Sat, Sep 19, 2015 at 3:34 PM, Thomas Petazzoni
>> <thomas.petazzoni@free-electrons.com> wrote:
>> > On Fri, 11 Sep 2015 12:00:09 +0200, Gary Bisson wrote:
>> >> This board is using the exact same kernel and u-boot revision as the
>> >> Nitrogen6x. They also share the same u-boot "autoboot" script.
>> >>
>> >> The differences between the two configurations are:
>> >> - getty port is ttymxc0 instead of ttymxc1
>> >> - uImage load address is 0x80008000
>> >
>> > Do you have a reason to keep using uImage instead of using zImage?
>> > uImage are now a bit deprecated on ARM, and zImage is the modern way of
>> > booting the kernel even from U-Boot (using the bootz command).
>>
>> Legacy I guess. I should look into it but the main advantage I see of
>> bootm/uImage is the CRC check. What is the story behind the switch to
>> bootz?
>
> Multiplatform. See [1], for example.
>
> [1]
> http://lists.infradead.org/pipermail/linux-arm-kernel/2011-September/066289.html

Thanks for the link. So indeed the mx6qdl vs mx6sx is the perfect
example to show the need of bootz.

Thanks,
Gary