On 11/01/2013 04:21 PM, Maxwell Bottiger wrote:
I have a custom kernel and drivers I built for an Atmel AT91SAM9x5ek
system on a chip, and I'd like to use them with yocto to build a
distribution.
The original documentation, support CD, etc are all based around an
open embedded build from 2011, which doesn't seem to work any longer.
Yocto looks like a great alternative, but wants to build the 3.10
kernel, which I don't think supports this SoC any longer. So, is
there a straight forward method of building a standard Poky root
filesystem, but with a custom recipe for the 2.6.39 kernel instead of
the stock one?
I use a 2.6.35 kernel on my own overlay. One thing i ran into with an
older kernel and new toolchain is the need for the
-mno-unaligned-access compile flag.
My example:
recipies-kernel/linux/linux-yocto-custom_2.6.35.12.bb
inherit kernel
#require recipes-kernel/linux/linux-yocto.inc
LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
DEFAULT_PREFERENCE = "-1"
LINUX_VERSION = "2.6.35.12"
LINUX_VERSION_EXTENSION ?= "-custom"
KBRANCH = "master"
META = "meta"
SRC_URI =
"git://my_url/linux-2.6.35.12.git;branch=${KBRANCH};branch=master;protocol=ssh;user=git"
SRC_URI += "file://defconfig"
SRC_URI += "file://extra-cflags-override.patch"
KERNEL_EXTRA_ARGS="LOADADDR=0x2000000 V=1 KCFLAGS=-mno-unaligned-access"
UBOOT_ENTRYPOINT="2000000"
SRCREV="master"
PV = "${LINUX_VERSION}"
PR = "r1"
S = "${WORKDIR}/git"
EXTRA_OEMAKE = "${PARALLEL_MAKE}"
# Override COMPATIBLE_MACHINE to include your machine in a bbappend
# file. Leaving it empty here ensures an early explicit build failure.
COMPATIBLE_MACHINE = "(xo1-mvs)"
kernel_do_configure() {
# fixes extra + in /lib/modules/2.6.37+
# $ scripts/setlocalversion . => +
# $ make kernelversion => 2.6.37
# $ make kernelrelease => 2.6.37+
touch ${B}/.scmversion ${S}/.scmversion
cp ${WORKDIR}/defconfig ${B}/.config
if [ ! -z "${INITRAMFS_IMAGE}" ]; then
for img in cpio.gz cpio.lzo cpio.lzma cpio.xz; do
if [ -e
"${DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE}-${MACHINE}.$img" ]; then
cp "${DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE}-${MACHINE}.$img"
initramfs.$img
fi
done
fi
}
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