Hi,
ArmV8 architecture allows to have at EL1 execute a kernel-OS as 64 bits and at
EL0 apps at 32 bits.
I was able to deploy a RootFS compiled as ARMv7 (32 bits) and boot a system to
login prompt.
Problem is now with kernel modules.
They are compiled in 64 bit mode, but they have to be insmod in a rootFS as 32
bits.
I created the recipe below posted to deploy my hello-mod.ko into the /myfiles
folder to do a manual test and insmod - it.
Yocto gave me a QA issue stating that the ko is built as AARC64 bits and it was
expecting a 32 bits.
I temporarily changed the execution permissions of the hello-mod.ko and yocto
is ok now.
I would like to post the question if somebody has tried what I described above.
>From the ARM architecture it is allowed, but I am not sure if it won't be a
>natural flow for linux to support it.
I'd appreciate any pointers.
--Hernan
=====================
SUMMARY = "Example of how to deploy an binary Linux kernel module"
LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e"
kmoddir = "/myfiles"
RDEPENDS_${PN} = "bash"
INHIBIT_PACKAGE_DEBUG_SPLIT = "1"
INHIBIT_PACKAGE_STRIP = "1"
SRC_URI = "file://${MACHINE}/hello-mod.ko \
file://COPYING \
"
#Don't configure or build this recipe
do_configure[noexec] = "1"
do_compile[noexec] = "1"
do_install_append() {
mkdir -p ${D}${kmoddir}/
install -d ${D}${kmoddir}/
cp -P ${WORKDIR}/${MACHINE}/hello-mod.ko ${D}${kmoddir}/hello-mod.ko
chmod -x ${D}${kmoddir}/hello-mod.ko
#find ${D}${kmoddir} -type f -exec chmod 755 {} \;
chown -R root:root "${D}"
}
#deploy files to final sysconfdir where rootfs will be generated
FILES_${PN} += "${kmoddir}/hello-mod.ko"
S = "${WORKDIR}"
--Hernan
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