[yocto] How do I patch the kernel before it is built?

[Bruce Ashfield]

On 12-02-06 03:18 PM, autif khan wrote:
>>>>>> I could not find a way to patch the kernel source before its is built.
>>>>>>
>>>>>> I promise to update the Yocto wiki's How do I section when I have a
>>>>>> working solution for the following :-)
>>>>>
>>>>> This should be covered in the existing documentation and also the
>>>>> more general bitbake/oe-core docs.
>>>>>
>>>>>>
>>>>>> Here is what I am trying to do:
>>>>>>
>>>>>> 1) Patch the kernel (add VID/PID to hid_ignore_list in
>>>>>> drivers/hid/hid-core.c and also to add the VID/PID to .h file)
>>>>>> 2) Build the kernel - no change here - standard kernel build
>>>>>> 3) Build a kernel module
>>>>>>
>>>>>> I have a meta layer where I am keeping my changes. I am guessing that I need to:
>>>>>>
>>>>>> a) write a bbappend file to accomplish #1
>>>>>> b) write a recipe to accomplish #3
>>>>>>
>>>>>> I have written recipes before, but just for libraries and autotools
>>>>>> based applications. Not for a kernel module. If there is a recipe out
>>>>>> there for some other module, I would be happy to steal from it.
>>>>>>
>>>>>> Please advise how I can go about patching the kernel and if there is a
>>>>>
>>>>> It's just like any other package. If your changes are simple, then
>>>>> generating patches and putting them on the SRC_URI via a bbappend in
>>>>> your layer is all you need. If you have complex changes, there are options
>>>>> to manage them via git or via feature descriptions.
>>>
>>> I tried this - attached at the end of this email are my bbappend file
>>> and my patches, when the recipe is bitbaked, it does not actually
>>> apply the patch.
>>>
>>> On a similar note - there seems to be a file in
>>> meta/recipes-kernel/linux/linux-yocto called
>>> tools-perf-no-scripting.patch
>>>
>>> However, it does not seem to be used anywhere - is this just crud or I
>>> am missing something? I was hoping to cheat off of the recipe that
>>> uses it.
>>>
>>>>>> recipe for a kernel module - please point me to it.
>>>>>
>>>>> Darren validated and updated the kernel module example, so he'd probably
>>>>> got this closer at hand than I do.
>>>>
>>>> See the hello-mod example under meta/recipes-kernel/hello-mod
>>>
>>> Thank you for this recipe - it seems like this is exactly what I was
>>> looking for. I will cheat off of this as soon as I can patch my
>>> kernel.
>>>
>>>
>>> R E C I P E
>>>
>>> autif at fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux$ cat
>>> linux-yocto_3.0.bbappend
>>> FILESEXTRAPATHS_prepend := "${THISDIR}:"
>>> SRC_URI += " file://linux/drivers/hid/hid-core.c.diff \
>>>              file://linux/drivers/hid/hid-ids.h.diff "
>>> PR = "r3"
>>> autif at fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux$
>>>
>>> P A T C H
>>>
>>> autif at fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux/linux/drivers/hid$
>>
>> Taking a look at this (while I was cutting and pasting), this should
>> be in in the
>> a 'linux-yocto' subdirectory if you want bitbake to pickup the patch and make it
>> available to the linux-yocto recipe.
>>
>> i.e. ~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux/linux-yocto/drivers/hid
>>
>> And don't use 'linux-yocto' in your file:// reference on the SRC_URI,
>> that part is
>> automatic.
>
> I tried this just now - here is what happens:
>
> Case - patch is in linux/linux-yocto/drivers/hid, SRC_URI ref is
> file://drivers/hid/file.diff
> Result: Fetcher failure for URL: 'file://drivers/hid/hid-core.c.diff

If you get a fetcher failire, you have it in the wrong place.

Note: this has nothing to do with the kernel and is a general
bitbake/oe-core question.

>
> Case - patch is in linux/linux-yocto/drivers/hid, SRC_URI ref is
> file://linux-yocto/drivers/hid/file.diff

Interesting. I've never had to specify linux-yocto in my SRC_URIs,
so something strange it going on here.

Does anyone else have ideas here ?


> Result - my diff files are copied in a directory called linux-yocto in
> tmp/work/crownbay-poky-linux/linux-yocto-3.0.4+git1+d05450e4aef02c1b7137398ab3a9f8f96da74f52_1+2247da9131ea7e46ed4766a69bb1353dba22f873-r3
>
> These patches are not applied in
> tmp/work/crownbay-poky-linux/linux-yocto-3.0.4+git1+d05450e4aef02c1b7137398ab3a9f8f96da74f52_1+2247da9131ea7e46ed4766a69bb1353dba22f873-r3/linux
>
> Here is what the work directory looks like
>
> autif at fpbm:~/ssd/minimal/tmp/work/crownbay-poky-linux/linux-yocto-3.0.4+git1+d05450e4aef02c1b7137398ab3a9f8f96da74f52_1+2247da9131ea7e46ed4766a69bb1353dba22f873-r3$
> ls
> git  license-destdir  linux  linux-crownbay-standard-build  linux-yocto  temp
> autif at fpbm:~/ssd/minimal/tmp/work/crownbay-poky-linux/linux-yocto-3.0.4+git1+d05450e4aef02c1b7137398ab3a9f8f96da74f52_1+2247da9131ea7e46ed4766a69bb1353dba22f873-r3$
>
>
> I have attached the original set of files as a tar gzip.

I'll take them for a spin.

>
>> (and yes, I see 'edison' was the branch now)
>
> Yes, I am using Yocto 1.0 - very soon I will migrate to M2 - pending
> tasks at hand :-)

I'll have to dig up a 1.0 tree, since I don't have anything of that
vintage available to me.

But I know that patched worked then, and am absolutely sure that it
works in 1.1 and master.

Cheers,

Bruce

>
>> Cheers,
>>
>> Bruce
>>
>>> cat hid-core.c.diff
>>> --- linux.orig/drivers/hid/hid-core.c   2012-01-31 16:44:44.152001877 -0500
>>> +++ linux/drivers/hid/hid-core.c        2012-01-31 16:46:34.608001870 -0500
>>> @@ -1839,6 +1839,8 @@
>>>         { HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_1_PHIDGETSERVO_20) },
>>>         { HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_8_8_4_IF_KIT) },
>>>         { HID_USB_DEVICE(USB_VENDOR_ID_YEALINK, USB_DEVICE_ID_YEALINK_P1K_P4K_B2K) },
>>> +       { HID_USB_DEVICE(USB_VENDOR_ID_PIXCIR, USB_DEVICE_ID_PIXCIR) },
>>>         { }
>>>   };
>>> autif at fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux/linux/drivers/hid$
>>> autif at fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux/linux/drivers/hid$
>>> cat hid-ids.h.diff--- linux.orig/drivers/hid/hid-ids.h  2012-01-31
>>> 16:44:55.432001877 -0500
>>> +++ linux/drivers/hid/hid-ids.h 2012-01-31 16:47:36.624001858 -0500
>>> @@ -671,4 +671,7 @@
>>>   #define USB_VENDOR_ID_ZYDACRON 0x13EC
>>>   #define USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL  0x0006
>>>
>>> +#define USB_VENDOR_ID_PIXCIR   0x040b
>>> +#define USB_DEVICE_ID_PIXCIR   0x2000
>>> +
>>>   #endif
>>> autif at fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux/linux/drivers/hid$
>>> _______________________________________________
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>>> yocto at yoctoproject.org
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>>
>>
>>
>> --
>> "Thou shalt not follow the NULL pointer, for chaos and madness await
>> thee at its end"
>>
>>
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