\>>>>>>>>> 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@fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux$ cat
linux-yocto_3.0.bbappend
FILESEXTRAPATHS_prepend := "${THISDIR}:"
SRC_URI += " file://linux/drivers/hid/hid-core.c.diff \
file://linux/drivers/hid/hid-ids.h.diff "
PR = "r3"
autif@fpbm:~/data/yocto/poky-edison-6.0/meta-koko/recipes/linux$

P A T C H



autif@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@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@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.

OK, I switched to M2 release and now, I have a different error:

Case - diff files are in recipes/linux/linux-yocto, SRC_URI is
file://drivers/hid/hid-core.c.diff
Result - ERROR: Function 'Fetcher failure for URL:
'file://drivers/hid/hid-core.c.diff'. Unable to fetch URL
file://drivers/hid/hid-core.c.diff from any source.' failed


Did, I misunderstood you when you said that I should rename the files
dir to linux-yocto - the name of the recipe and remove it from the
SRC_URI?

Every build that I do with my meta-kernel-dev has some out of tree
patches. It's a form of continual regression testing that I do out
of habit.

My bbappend looks like this:

SRC_URI =
"git://${KSRC_linux_yocto};protocol=file;nocheckout=1;branch=${KBRANCH},meta;name=machine,meta
\
file://make.patch \
file://subdir/make2.patch \
file://subdir/make3.patch"

pwd

/home/bruce/yocto/poky-extras/meta-kernel-dev/recipes-kernel/linux

tree linux-yocto

linux-yocto
├── make.patch
└── subdir
├── make2.patch
└── make3.patch

These are always applied to my build.

Cheers,

Bruce

I will try that next. However, it seems like something is wrong with
my setup may be.

I was reading the log.do_patch file and it seems like bitbake is
mixing my build and recipes directory.

The recipe and logs are attached in this email. Once again, I have
switched to M2 now. This is no longer with Yocto 1.0.