The poky-extras meta-kernel-dev layer seems to force a complete rebuild
of linux-yocto from do_fetch at every invocation of bitbake, even if
nothing changed in the kernel.
For example, if I run:
$ bitbake core-image-minimal
And it builds everything, including linux-yocto, but do_bootimg fails in
core-image-minimal, and I then fix the issue in bootimg.bbclass and run:
$ bitbake core-image-minimal
It starts with do_fetch of linux-yocto.
The linux-yocto_3.0.bbappend in my meta-kernel-dev looks like the following:
FILESEXTRAPATHS := "${THISDIR}/${PN}"
COMPATIBLE_MACHINE = ${MACHINE}
# KMACHINE is the branch to build
# KMACHINE_<MACHINE> ?= "yocto/${LINUX_KERNEL_TYPE}/${KMACHINE}"
# KERNEL_FEATURES are features to be added to the kernel, and must
# point to configurations stored on the 'meta' branch of the kernel
# that is being built.
# KERNEL_FEATURES ?= <FOO>
# It is often nice to have a local clone of the kernel repos, to
# allow patches to be staged, branches created, etc. Modify
# KSRC_linux_yocto to point to your local clone as appropriate.
# KSRC_linux_yocto ?= /path/to/local/linux-yocto-3.0
KMACHINE ?= "yocto/${LINUX_KERNEL_TYPE}/${KMACHINE}"
SRC_URI =
"git://${KSRC_linux_yocto};protocol=file;nocheckout=1;branch=${KBRANCH},meta;name=machine,meta"
KERNEL_REVISION_CHECKING=
SRCREV=${AUTOREV}
#BB_LOCALCOUNT_OVERRIDE = "1"
LOCALCOUNT = "0"
In my bblayers, I have:
$ cat bblayers.conf
# LAYER_CONF_VERSION is increased each time build/conf/bblayers.conf
# changes incompatibly
LCONF_VERSION = "4"
#PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"
#PREFERRED_VERSION_linux-yocto-rt = "3.0+git%"
KSRC_linux_yocto=/home/dvhart/source/linux/linux-yocto-3.0.git
KSRC_linux_yocto_dev=/home/dvhart/source/linux/linux-yocto-dev.git
BBFILES ?= ""
BBLAYERS = " \
/home/dvhart/source/poky/meta \
/home/dvhart/source/poky/meta-yocto \
/home/dvhart/source/poky/layers/meta-intel \
/home/dvhart/source/poky/layers/meta-intel/meta-sys940x \
/home/dvhart/source/poky/layers/poky-extras/meta-kernel-dev \
"
Bruce says it doesn't behave this way for him. Anyone have any ideas
what might be triggering this?
--
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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