Re: 3.8 config file for CARMA card

Re: 3.8 config file for CARMA card

[Peter De Schrijver]

(added linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org)

Hello,

> Hello Peter,
> 
> Apologies if you are the wrong person to ask. Since you submitted the patch for Tegra 3 support, I thought I try asking you since I can't seem to find any answers elsewhere.
> 
> I am looking for a working .config file for the CARMA dev board so I can bring the CARMA cards that I have (7) up to a more current kernel version. I've tried to start from /proc/config.gz which is a 3.1 config file but the resultant kernel compiled on the card won't boot on the CARMA cards. Thanks in advance for any help you can provide.

Unfortunately we don't have support for the carma dev board upstream yet. Also PCIe support is still missing from upstream, although I expect that to change in the near future. 

Regards,

Peter.

Re: 3.8 config file for CARMA card

[Stephen Warren]

On 04/02/2013 05:36 AM, Peter De Schrijver wrote:
> (added linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org)
> 
> Hello,
> 
>> Hello Peter,
>>
>> Apologies if you are the wrong person to ask. Since you submitted the patch for Tegra 3 support, I thought I try asking you since I can't seem to find any answers elsewhere.
>>
>> I am looking for a working .config file for the CARMA dev board so I can bring the CARMA cards that I have (7) up to a more current kernel version. I've tried to start from /proc/config.gz which is a 3.1 config file but the resultant kernel compiled on the card won't boot on the CARMA cards. Thanks in advance for any help you can provide.
> 
> Unfortunately we don't have support for the carma dev board upstream yet. Also PCIe support is still missing from upstream, although I expect that to change in the near future. 

Spencer, which 3.8 kernel are you attempting to use?

As Peter mentioned, we don't support CARMA upstream at the moment.
However, in theory, you should simply need to write a device tree file
to enable the upstream kernel to boot on CARMA.

(arch/arm/configs/)tegra_defconfig is the .config file for Tegra in the
upstream kernel. It should enable pretty much anything Tegra-related,
and should be suitable for your use once you've written a CARMA device tree.

You might also want to consider porting upstream U-Boot, and creating a
configuration file for cbootimage-configs:

http://nv-tegra.nvidia.com/gitweb/?p=tools/tegra-cbootimage-configs.git;a=summary

so that you can use a completely Open-Source flashing process.

Re: 3.8 config file for CARMA card

[Stephen Warren]

On 04/03/2013 09:00 PM, Spencer Cheng wrote:
> Hi Stephen,
> 
> On Apr 3, 2013, at 17:35, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> wrote:
>> Spencer, which 3.8 kernel are you attempting to use?
>>
> 
> It was the stable 3.8 kernel at the time, perhaps 3.8.2.
> 
>> As Peter mentioned, we don't support CARMA upstream at the moment.
>> However, in theory, you should simply need to write a device tree file
>> to enable the upstream kernel to boot on CARMA.
> 
> Is there a HowTo on writing the device tree file? 

I don't think there's an explicit HowTo.

To get a general idea of DT content, I would start by simply reading the
existing Tegra device trees in the upstream kernel. It's probably best
to take a look at the Tegra-specific tree so you see the very latest
changes:

git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra.git
branch for-next
files arch/arm/boot/dts/tegra*.dts*
directory Documentation/devicetree/bindings/

As far as general DT background information, you could look at the
following links, which I cribbed from our internal wiki:

http://devicetree.org/Main_Page (many other links are on this page).

http://devicetree.org/Device_Tree_Usage (general DT structure for a board)

http://devicetree.org/MPC5200:PCI (some background info re: PCI
bindings; I have no idea how correct/applicable this is, but it should
aid understanding at least)

http://lists.ozlabs.org/listinfo/devicetree-discuss

http://elinux.org/images/1/14/Glikely--device-tree.pdf

http://elinux.org/Device_Trees

http://wiki.freebsd.org/FlattenedDeviceTree

http://www.denx.de/wiki/DULG/LinuxFDTBlob