[meta-xilinx] bitbake new version of xilinx_emacps.c

[Edward Wingate]

Use git to create the patch.  See section 5.8.3 here:
http://www.yoctoproject.org/docs/1.8/dev-manual/dev-manual.html#patching-the-kernel


On Thu, Jul 2, 2015 at 6:18 AM, Harold Lapprich
<hlapprich at pixel-velocity.com> wrote:
> Nathan,
>
> Thanks for the quick reply. Was able to identify 'file append' or 'file patch' as the approach to take yesterday. Have read a number of documents on the topic:
>
>         1. Yocto Project Development Manual,
>         2. Embedded Linux Development with Yocto Project (Otavio Salvador, Daiane Angolini),
>         3. and Yocto Project Linux Kernel Development Manual, 2.2.2 Adding Patches.
>
>
> Very experienced in Unix/Linux for embedded systems but just started using Yocto about 5 months ago (seems to be the way to go, very nice architecture for embedded Linux).
>
> Identifed the version of 'xilinx_emacps.c' that I need to update to URL: https://github.com/Xilinx/linux-xlnx/tree/master/drivers/net/ethernet/xilinx
> and have done a comparison between the current version and the update version via 'windiff' but have no experience with creating a patch file. There must be a Yocto tool for generating the patch file or a cookbook procedure since it is key to the Yocto architecture, do you know where I might find this tool?
>
> Thanks,
> Harold
>
>
> -----Original Message-----
> From: Nathan Rossi [mailto:nathan at nathanrossi.com]
> Sent: Thursday, July 02, 2015 12:59 AM
> To: Harold Lapprich
> Cc: meta-xilinx at yoctoproject.org
> Subject: Re: [meta-xilinx] bitbake new version of xilinx_emacps.c
>
> On Thu, Jul 2, 2015 at 7:53 AM, Harold Lapprich <hlapprich at pixel-velocity.com> wrote:
>> To Whom It May Concern,
>>
>>
>>
>> Currently working with Yocto 'daisy' xlnx-3.14 for an embedded project
>> and need to upgrade 'xilinx_emacps.c' and looking for directions or
>> insight on how best to do this, does anyone have a cookbook example
>> that I can look at (haven't been able to identify the layer for the
>> driver and since it is a devicetree attribute I am guessing meta-xlinx)?
>>
>
> The emacps driver is part of the linux-xlnx kernel. You will need to patch the kernel to change xilinx_emacps.c. The easiest way to go about doing that is to create a patch against the kernel source and then use a .bbappend to get yocto to apply the patch during the build of the linux-xlnx kernel.
>
> There is some documentation around this topic here:
> http://www.yoctoproject.org/docs/current/kernel-dev/kernel-dev.html#applying-patches
>
> Regards,
> Nathan
>
>>
>>
>> Thanks,
>>
>> Harold
>>
>>
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