On 2015-02-23 10:02 AM, Jens Rapp wrote:
hi,
i have a simple hello world kernel module and i cannot compile it. linux
headers are missing
i tried to set -I $(OECORE_TARGET_SYSROOT)usr/src/kernel/include/
but there seems to be much more missing..
What release are you using ? The kernel sources recently changed
in master (for the 1.8 release), so that could be catching you
in transition.
is there any way to do this easier?
We have an example in meta-skeleton for a hello world module.
(meta-skeleton/recipes-kernel/hello-mod/). Have a look there and
it may answer most (if not all) questions.
Bruce
here's what i have:
module.c
-------------
#include <linux/module.h>
#include <linux/spi.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
/**
* initialisiert das Kernel - Modul
*/
int init_module(void) {
printk(KERN_DEBUG "Hallo Kernel!\n");
return 0;
}
void cleanup_module (void) {
printk (KERN_DEBUG "Ciao!\n");
}
and my Makefile
----------------------
# file Makefile
# copyright Copyright (c) 2012 Toradex AG
# [Software License Agreement]
# author $Author$
# version $Rev$
# date $Date$
# brief a simple makefile to (cross) compile.
# uses the openembedded provided sysroot and toolchain
# target linux on Colibri T20 / Colibri T30
# caveats -
##############################################################################
# Setup your project settings
##############################################################################
# Set the input source files, the binary name and used libraries to link
SRCS = module.c
PROG := module
LIBS =
CONF_LIBS =
C_FLAGS = -D__KERNEL__ -D__SMP__ -DMODULE -DMODVERSIONS
# Set flags to the compiler and linker
CFLAGS += -O2 -g -Wall `$(PKG-CONFIG) --cflags $(CONF_LIBS)`
$(ARCH_CFLAGS) $(C_FLAGS)
LDFLAGS += `$(PKG-CONFIG) --libs $(CONF_LIBS)`
##############################################################################
# Setup your build environment
##############################################################################
# Set the path to the oe built sysroot and
# Set the prefix for the cross compiler
OECORE_NATIVE_SYSROOT ?=
$(HOME)/oe-core/build/out-eglibc/sysroots/x86_64-linux/
OECORE_TARGET_SYSROOT ?=
$(HOME)/oe-core/build/out-eglibc/sysroots/apalis-imx6/
CROSS_COMPILE ?=
$(OECORE_NATIVE_SYSROOT)usr/bin/armv7at2hf-vfp-neon-angstrom-linux-gnueabi/arm-angstrom-linux-gnueabi-
##############################################################################
# The rest of the Makefile usually needs no change
##############################################################################
# Set differencies between native and cross compilation
ifneq ($(strip $(CROSS_COMPILE)),)
LDFLAGS += -L$(OECORE_TARGET_SYSROOT)usr/lib
-Wl,-rpath-link,$(OECORE_TARGET_SYSROOT)usr/lib
-L$(OECORE_TARGET_SYSROOT)lib -Wl,-rpath-link,$(OECORE_TARGET_SYSROOT)lib
ARCH_CFLAGS = -march=armv7-a -fno-tree-vectorize -mthumb-interwork
-mfloat-abi=hard -mtune=cortex-a9
BIN_POSTFIX =
PKG-CONFIG = export PKG_CONFIG_SYSROOT_DIR=$(OECORE_TARGET_SYSROOT); \
export
PKG_CONFIG_PATH=$(OECORE_TARGET_SYSROOT)/usr/lib/pkgconfig/; \
$(OECORE_NATIVE_SYSROOT)usr/bin/pkg-config
else
# Native compile
PKG-CONFIG = pkg-config
ARCH_CFLAGS =
# Append .x86 to the object files and binaries, so that native and cross
builds can live side by side
BIN_POSTFIX = .x86
endif
# Toolchain binaries
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)gcc
STRIP = $(CROSS_COMPILE)strip
RM = rm -f
# Sets the output filename and object files
PROG := $(PROG)$(BIN_POSTFIX)
OBJS = $(SRCS:.c=$(BIN_POSTFIX).o)
DEPS = $(OBJS:.o=.o.d)
# pull in dependency info for *existing* .o files
-include $(DEPS)
all: $(PROG)
$(PROG): $(OBJS) Makefile
$(CC) $(CFLAGS) -o $@ $(OBJS) $(LIBS) $(LDFLAGS)
#$(STRIP) $@
%$(BIN_POSTFIX).o: %.c
$(CC) -c $(CFLAGS) -o $@ $<
$(CC) -MM $(CFLAGS) $< > $@.d
clean:
$(RM) $(OBJS) $(PROG) $(DEPS)
.PHONY: all clean
--
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