I’m trying to build an out of tree module for a Pure LiFi USB dongle but I’m not having much luck.
I modified v2.0.2 of this repo GitHub - balena-os/kernel-module-build: Example project for building an OOT kernel module in balena to pull in the module to use Balena OS version 2.88.4.dev as well as copy in the module source.
The module seems to build correctly but when the container runs insmod the following error is generated
insmod: can't insert '/etc/output/linux_r16858_raspberrypicm4-ioboard_2.88.4.dev/purelifi.ko': unknown symbol in module, or unknown parameter
Here is the Docker.template file
FROM ubuntu:jammy-20220531 as kernel-build
ARG DEBIAN_FRONTEND=noninteractive
ENV TZ=Etc/UTC
RUN apt-get update && \
apt-get install -y \
awscli \
bc \
bison \
build-essential \
curl \
flex \
git \
libelf-dev \
libssl-dev \
wget
WORKDIR /usr/src/app
# Clones the kernel builder repository
# RUN git clone https://github.com/balena-os/kernel-module-build.git .
# You can switch to a specific commit of the kernel builder if you want to ensure consistent builds
# git reset --hard f889851c5d00890b51b27c63eaa59a976063265a
# Copy your kernel source from your local build context to the build directory
COPY . .
# Set the name of the directory where you have copied your kernel source in the step above
ENV MOD_DIR "linux_r16858"
# Set the balena OS version you intend to use
ENV OS_VERSION '2.88.4.dev'
# Start the build
RUN BALENA_MACHINE_NAME=%%BALENA_MACHINE_NAME%% ./build.sh build --device %%BALENA_MACHINE_NAME%% --os-version "$OS_VERSION" --src "$MOD_DIR"
FROM alpine
# Set the directory where you would like your kernel source
ARG MOD_PATH=/etc/output
ENV MOD_DIR linux_r16858
# Required for access when the container starts
ENV MOD_PATH="$MOD_PATH"
# Copy the built kernel module into your app
COPY --from=kernel-build /usr/src/app/output/ "$MOD_PATH"
# Copy the startup script for loading the modules
COPY --from=kernel-build /usr/src/app/run.sh /usr/src/app/run.sh
# Start the script that loads the modules.
ENTRYPOINT ["sh", "/usr/src/app/run.sh"]
# Run your usual service with CMD
CMD exec /bin/sh -c "trap : TERM INT; sleep 9999999999d & wait"
Unfortunately I don’t have much experience working with out of tree modules so I’m not sure what I should try next.
I can forward the module drivers if that would help but in the interim here is the module Makefile.
# ===========================================================================
# File : Makefile
# Entity : linux
# Purpose : Makefile of purelifi driver
# ===========================================================================
# Design Engineer : Angelos Spanos (DE)
# Creation Date : 18-Jan-2016
# ===========================================================================
TARGET=purelifi
TARGET_MODULE=$(TARGET).ko
obj-m += $(TARGET).o
$(TARGET)-objs := $(TARGET)_chip.o $(TARGET)_mac.o $(TARGET)_usb.o
PWD = $(shell pwd)
EXTRA_CFLAGS +=-Wdeclaration-after-statement
EXTRA_CFLAGS +=-DTYPE_STA
KERNEL_PATH=/lib/modules/$(shell uname -r)/build
MODULE_INSTALLATION_PATH=/lib/modules/$(shell uname -r)/kernel/drivers/net/wireless/
FIRMWARE_BASE_PATH_GENERIC=/lib/firmware
FIRMWARE_BASE_PATH_KERNEL=$(FIRMWARE_BASE_PATH_GENERIC)/$(shell uname -r)/$(TARGET)
FIRMWARE_INSTALLATION_PATH=purelifi/li_fi_x
FIRMWARE_SOURCE_PATH=firmware
FIRMWARE_SOURCE_BINARY={fpga.bit,usb_slave_fw.hex}
RM_FLAGS=-rf
SRC+=$(wildcard *.c)
SRC+=$(wildcard *.h)
MODULE_BOOT_LAOD_FILE=/etc/modules
all: $(TARGET_MODULE)
ifneq ($(wildcard /etc/pm/config.d/config),)
ifeq ($(shell grep SUSPEND_MODULES /etc/pm/config.d/config),)
install:$(TARGET_MODULE) add_suspend_module
else
ifeq ($(shell grep SUSPEND_MODULES /etc/pm/config.d/config | grep purelifi),)
install:$(TARGET_MODULE) append_suspend_module
endif
endif
endif
$(TARGET_MODULE):$(SRC)
@if [ ! -d "$(KERNEL_PATH)" ]; then echo "$(KERNEL_PATH) doesn't exist. Please install the kernel headers first."; false; fi
make -C $(KERNEL_PATH) M=$(PWD) EXTRA_CFLAGS="$(EXTRA_CFLAGS)" modules
install:
@if [ ! -d "$(MODULE_INSTALLATION_PATH)" ]; then mkdir -p $(MODULE_INSTALLATION_PATH); fi
cp -f $(TARGET_MODULE) $(MODULE_INSTALLATION_PATH)
@if [ "$(shell grep $(TARGET) $(MODULE_BOOT_LAOD_FILE))" != "$(TARGET)" ]; then echo $(TARGET) >> $(MODULE_BOOT_LAOD_FILE); fi
@if [ -d "$(FIRMWARE_BASE_PATH_KERNEL)" ]; then \
mkdir -p $(FIRMWARE_BASE_PATH_KERNEL)/$(FIRMWARE_INSTALLATION_PATH)/ ; \
fi
mkdir -p $(FIRMWARE_BASE_PATH_GENERIC)/$(FIRMWARE_INSTALLATION_PATH)/
$(shell find $(FIRMWARE_BASE_PATH_GENERIC)/$(FIRMWARE_INSTALLATION_PATH) -type l -name fpga.bit -exec rm {} \;)
cp $(FIRMWARE_SOURCE_PATH)/* $(FIRMWARE_BASE_PATH_GENERIC)/$(FIRMWARE_INSTALLATION_PATH)/
depmod
modprobe -r $(TARGET)
modprobe $(TARGET)
add_suspend_module:
echo 'SUSPEND_MODULES="purelifi"' >> /etc/pm/config.d/config
append_suspend_module:
$(shell sed -i 's/\(SUSPEND_MODULES *= *"\)\(.*\)/\1$(TARGET) \2/g' /etc/pm/config.d/config)
tags:
ctags -R ./ ../../mac80211/ $(KERNEL_PATH)
clean:
@$(RM) $(RM_FLAGS) $(TARGET_MODULE) *.o* .*.cmd .*.mk Module.symvers modules.order $(TARGET).mod.c .tmp_versions *.ko*
Thanks,