How to config kernel in my own meta layer?

How to config kernel in my own meta layer?

[Fan Zhang]

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Greetings,

I have a recipes that requires 128MB of CMA allocation for DMA. I 
followed the instruction in 
http://www.yoctoproject.org/docs/1.6/kernel-dev/kernel-dev.html#changing-the-configuration 
and did the following:

My recipes structure:

meta-mylayer\recipes-my\uio-test\

1. Then in uio-test folder, I have uio-test.bb that created by 
recipetool (in general) with some modification. uio-test.bb looks like 
this:

#------------------------------------------------------------------

# Recipe created by recipetool
# This is the basis of a recipe and may need further editing in order to 
be fully functional.
# (Feel free to remove these comments when editing.)

# Unable to find any files that looked like license statements. Check 
the accompanying
# documentation and source headers and set LICENSE and LIC_FILES_CHKSUM 
accordingly.
#
# NOTE: LICENSE is being set to "CLOSED" to allow you to at least start 
building - if
# this is not accurate with respect to the licensing of the software 
being built (it
# will not be in most cases) you must specify the correct value before 
using this
# recipe for anything other than initial testing/development!
LICENSE = "CLOSED"
LIC_FILES_CHKSUM = ""

# No information for SRC_URI yet (only an external source tree was 
specified)
PV = "2.0.2"
SRC_URI = "file://src"

# NOTE: this is a Makefile-only piece of software, so we cannot generate 
much of the
# recipe automatically - you will need to examine the Makefile yourself 
and ensure
# that the appropriate arguments are passed in.

do_configure () {
     # Specify any needed configure commands here
     :
}

do_compile () {
     # You will almost certainly need to add additional arguments here
     cd ${WORKDIR}/src
     oe_runmake
}

FILES_${PN} = "/www/pages /etc/lighttpd.d"
do_install () {
     # This is a guess; additional arguments may be required
     cd ${WORKDIR}/src
     oe_runmake install 'DESTDIR=${D}'
}

DEPENDS = "libgcc boost"
RDEPENDS_${PN} = "libgcc boost-thread boost-system lighttpd 
lighttpd-module-cgi"
#------------------------------------------------------------------

2. Also in uio-test folder, I have uio-test.bbappend file with these 
contents:

#------------------------------------------------------------------

FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
SRC_URI += "file://uio-test.cfg"

#----------------------^^^^^^^^^^^^^^^^^^^-------------------------

3. In uio-test/files folder, I have uio-test.cfg with the following 
contents:


#------------------------------------------------------------------

CONFIG_CMA_ALIGNMENT=8
CONFIG_CMA=y
CONFIG_CMA_AREAS=7
CONFIG_DMA_CMA=y
CONFIG_CMA_SIZE_MBYTES=128
CONFIG_CMA_SIZE_SEL_MBYTES=y
CONFIG_DMADEVICES=y
CONFIG_DMA_ENGINE=y
CONFIG_DMA_OF=y
CONFIG_XILINX_DMA_ENGINES=y
CONFIG_XILINX_DMA=y
CONFIG_DMA_API_DEBUG=y
CONFIG_HAS_DMA=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_HAVE_DMA_CONTIGUOUS=y
CONFIG_HAVE_DMA_API_DEBUG=y
CONFIG_HAVE_GENERIC_DMA_COHERENT=y
CONFIG_ARM_DMA_MEM_BUFFERABLE=y
CONFIG_ZONE_DMA_FLAG=0
#----------------------^^^^^^^^^^^^^^^^^^^-------------------------

My question: I think the cfg file is being parsed because if I change 
the folder name files to something else, bitbake will complaint about 
not being able to find uio-test.cfg. However, the final .config in built 
do not have the CMA allocated. My meta layer does have a priority higher 
than the upstream layers. What else can cause the problem here? Any 
suggestions? Thanks.

Fan Zhang


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fn:Fan Zhang
n:Zhang;Fan
org:Sander Geophysics Ltd. 
email;internet:fzhang@sgl.com
title:Electronics Design Engineer
tel;work:(613)521-9626
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end:vcard

Re: How to config kernel in my own meta layer?

[Bruce Ashfield]

On Thu, Dec 21, 2017 at 11:32 AM, Fan Zhang <fzhang@sgl.com> wrote:
> Greetings,
>
> I have a recipes that requires 128MB of CMA allocation for DMA. I followed
> the instruction in
> http://www.yoctoproject.org/docs/1.6/kernel-dev/kernel-dev.html#changing-the-configuration
> and did the following:
>
> My recipes structure:
>
> meta-mylayer\recipes-my\uio-test\
>
> 1. Then in uio-test folder, I have uio-test.bb that created by recipetool
> (in general) with some modification. uio-test.bb looks like this:
>
> #------------------------------------------------------------------
>
> # Recipe created by recipetool
> # This is the basis of a recipe and may need further editing in order to be
> fully functional.
> # (Feel free to remove these comments when editing.)
>
> # Unable to find any files that looked like license statements. Check the
> accompanying
> # documentation and source headers and set LICENSE and LIC_FILES_CHKSUM
> accordingly.
> #
> # NOTE: LICENSE is being set to "CLOSED" to allow you to at least start
> building - if
> # this is not accurate with respect to the licensing of the software being
> built (it
> # will not be in most cases) you must specify the correct value before using
> this
> # recipe for anything other than initial testing/development!
> LICENSE = "CLOSED"
> LIC_FILES_CHKSUM = ""
>
> # No information for SRC_URI yet (only an external source tree was
> specified)
> PV = "2.0.2"
> SRC_URI = "file://src"
>
> # NOTE: this is a Makefile-only piece of software, so we cannot generate
> much of the
> # recipe automatically - you will need to examine the Makefile yourself and
> ensure
> # that the appropriate arguments are passed in.
>
> do_configure () {
>     # Specify any needed configure commands here
>     :
> }
>
> do_compile () {
>     # You will almost certainly need to add additional arguments here
>     cd ${WORKDIR}/src
>     oe_runmake
> }
>
> FILES_${PN} = "/www/pages /etc/lighttpd.d"
> do_install () {
>     # This is a guess; additional arguments may be required
>     cd ${WORKDIR}/src
>     oe_runmake install 'DESTDIR=${D}'
> }
>
> DEPENDS = "libgcc boost"
> RDEPENDS_${PN} = "libgcc boost-thread boost-system lighttpd
> lighttpd-module-cgi"
> #------------------------------------------------------------------
>
> 2. Also in uio-test folder, I have uio-test.bbappend file with these
> contents:
>
> #------------------------------------------------------------------
>
> FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
> SRC_URI += "file://uio-test.cfg"
>
> #----------------------^^^^^^^^^^^^^^^^^^^-------------------------
>
> 3. In uio-test/files folder, I have uio-test.cfg with the following
> contents:
>
>
> #------------------------------------------------------------------
>
> CONFIG_CMA_ALIGNMENT=8
> CONFIG_CMA=y
> CONFIG_CMA_AREAS=7
> CONFIG_DMA_CMA=y
> CONFIG_CMA_SIZE_MBYTES=128
> CONFIG_CMA_SIZE_SEL_MBYTES=y
> CONFIG_DMADEVICES=y
> CONFIG_DMA_ENGINE=y
> CONFIG_DMA_OF=y
> CONFIG_XILINX_DMA_ENGINES=y
> CONFIG_XILINX_DMA=y
> CONFIG_DMA_API_DEBUG=y
> CONFIG_HAS_DMA=y
> CONFIG_NEED_DMA_MAP_STATE=y
> CONFIG_HAVE_DMA_CONTIGUOUS=y
> CONFIG_HAVE_DMA_API_DEBUG=y
> CONFIG_HAVE_GENERIC_DMA_COHERENT=y
> CONFIG_ARM_DMA_MEM_BUFFERABLE=y
> CONFIG_ZONE_DMA_FLAG=0
> #----------------------^^^^^^^^^^^^^^^^^^^-------------------------
>
> My question: I think the cfg file is being parsed because if I change the
> folder name files to something else, bitbake will complaint about not being
> able to find uio-test.cfg. However, the final .config in built do not have
> the CMA allocated. My meta layer does have a priority higher than the
> upstream layers. What else can cause the problem here? Any suggestions?
> Thanks.

The question is ... which kernel is it ? If the kernel recipe you are
using doesn't
inherit linux-yocto, the fragments won't be applied.

And a second question, what release/branch are you using ?

On that note, I actually have a patch completed to move the core of the fragment
support to kernel.bbclass, so any kernel could use it. So if you
aren't linux-yocto
and would like to test a patch, I could send it along.

Bruce

>
> Fan Zhang
>
>
> --
> _______________________________________________
> yocto mailing list
> yocto@yoctoproject.org
> https://lists.yoctoproject.org/listinfo/yocto
>



-- 
"Thou shalt not follow the NULL pointer, for chaos and madness await
thee at its end"

Re: How to config kernel in my own meta layer?

[Patrick Ohly]

On Thu, 2017-12-21 at 10:32 -0500, Fan Zhang wrote:
> Greetings,
> 
> I have a recipes that requires 128MB of CMA allocation for DMA. I
> followed the instruction in  http://www.yoctoproject.org/docs/1.6/ker
> nel-dev/kernel-dev.html#changing-the-configuration and did the
> following:
> 
> My recipes structure: 
> 
> 
> meta-mylayer\recipes-my\uio-test\
> 
> 1. Then in uio-test folder, I have uio-test.bb 
> 
[...]

> My question: I think the cfg file is being parsed because if I change
> the folder name files to something else, bitbake will complaint about
> not being able to find uio-test.cfg. However, the final .config in
> built do not have the CMA allocated.

I suspect there's a fundamental misunderstanding. Your uio-test.bb is a
separate recipe, and therefore its content has no effect whatsoever on
the kernel configuration.

The right place to add your "file://uio-test.cfg" is in a .bbappend for
the kernel that you are building. But as Bruce said, that kernel must
be derived from linux-yocto.

-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.