help needed
I must be doing something wrong but I have read the architecture reference manual a dozen times and googled this question just as much. I also purchased the "FreeBSD device drivers: for the intrepid" book but it doesnt target cross development issues ...
I just wanted to verify that the skeleton driver (pseudo kernel module) can be built for ARM. I had no issues cross compiling a copy of the kernel I placed in a particular directory (/home/devel/nfsroot/usr/src) with the following environment variables set accordingly
BASEDIR=/home/devel/nfsroot
KERNBUILDDIR=/home/devel/nfsroot/obj/home/devel/nfsroot/usr/src/arm.armv7/sys/GENERIC
SYSDIR=/home/devel/nfsroot/usr/src/sys
MAKEOBJDIRPREFIX=/home/devel/nfsroot/obj
cd $BASEDIR/usr/src
**make TARGET=arm TARGET_arch=armv7 KERNCONF=GENERIC buildkernel**
takes about an hour on my system but when it completes I can verify it created an object file that can be run on my arm development board
file /home/devel/nfsroot/obj/home/devel/nfsroot/usr/src/arm.armv7/sys/GENERIC/kernel
returns
**kernel: ELF 32-bit LSB executable, ARM, EABI5 version 1 (FreeBSD), dynamically linked, interpreter /red/herring, BuildID[sha1]=e5b7d6488e6324e8dc8686fb925a5722d84a3238, for FreeBSD 14.4 (1404500), not stripped**
The kernel source is FreeBSD 14.3 and under my home directory I had the skeleton.c pseudo module along with a Makefile whose contents are
Makefile
**************
SRCS=skeleton.c
KMOD=skeleton
.include <bsd.kmod.mk>
Running make with this makefile will create a file skeleton.ko that can be loaded into the kernel by typing:
# kldload -v ./skeleton.ko
******************************
Again all this is provided by FreeBSD
Now when I run
make TARGET=arm TARGET_ARCH=armv7
It completes in about a few seconds but I can clearly see - even before running the output against "file" its not building for an arm target.
machine -> /home/devel/nfsroot/usr/src/sys/amd64/include
x86 -> /home/devel/nfsroot/usr/src/sys/x86/include
i386 -> /home/devel/nfsroot/usr/src/sys/i386/include
Warning: Object directory not changed from original /home/devel/nfsroot/bsd_example_driver
cc -O2 -pipe -fno-strict-aliasing -Werror -D_KERNEL -DKLD_MODULE -nostdinc -DHAVE_KERNEL_OPTION_HEADERS -include /home/devel/nfsroot/obj/home/devel/nfsroot/usr/src/arm.armv7/sys/GENERIC/opt_global.h -I. -I/home/devel/nfsroot/usr/src/sys -I/home/devel/nfsroot/usr/src/sys/contrib/ck/include -fno-common -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/home/devel/nfsroot/usr/src/sys=/usr/src/sys -ffile-prefix-map=/home/devel/nfsroot/obj/home/devel/nfsroot/usr/src/arm.armv7/sys/GENERIC=/usr/obj/usr/src/amd64.amd64/sys/GENERIC -ffile-prefix-map=/home/devel/nfsroot/bsd_example_driver=/usr/obj/usr/src/amd64.amd64/sys/GENERIC/modules/usr/src/sys/modules/bsd_example_driver -fdebug-prefix-map=./machine=/usr/src/sys/amd64/include -fdebug-prefix-map=./x86=/usr/src/sys/x86/include -fdebug-prefix-map=./i386=/usr/src/sys/i386/include -I/home/devel/nfsroot/obj/home/devel/nfsroot/usr/src/arm.armv7/sys/GENERIC -MD -MF.depend.skeleton.o -MTskeleton.o -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__ -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error=tautological-compare -Wno-error=empty-body -Wno-error=parentheses-equality -Wno-error=unused-function -Wno-error=pointer-sign -Wno-error=shift-negative-value -Wno-address-of-packed-member -Wno-format-zero-length -mno-aes -mno-avx -std=gnu99 -c skeleton.c -o skeleton.o
ld -m elf_x86_64_fbsd -warn-common --build-id=sha1 -T /home/devel/nfsroot/usr/src/sys/conf/ldscript.kmod.amd64 -r -o skeleton.ko skeleton.o
:> export_syms
awk -f /home/devel/nfsroot/usr/src/sys/conf/kmod_syms.awk skeleton.ko export_syms | xargs -J% objcopy % skeleton.ko
objcopy --strip-debug skeleton.ko
What am I doing wrong?
skeleton pseudo kernel module and Makefile are provided unchanged. And as I stated I can build (cross compile) an armv7 kernel without an issue
Thanks in advance
