[yocto] How to config kernel in my own meta layer?

[Fan Zhang]

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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