Yocto学习笔记

1. 例子

#kernel-module-m8887-wlan.bb
DESCRIPTION = "Marvell M8887 Wifi kernel module"

require include/rcar-gen3-modules-common.inc

LICENSE = "GPLv2 & MIT"
LIC_FILES_CHKSUM = " \
    file://m8887/wlan/gpl-2.0.txt;md5=ab04ac0f249af12befccb94447c08b77 \
"

inherit module
DEPENDS = "linux-renesas"
PV = "15.44"
PR = "r4"

MARVELL_M8887_URL = "git://xxx/wireless.git"
BRANCH = "master"
BRANCH_board1 = "board1/master"
BRANCH_board2 = "board2/master"

# 若使用SRCREV=${AUTOREV} 使用AUTOREV不能编译旧版本的软件! （也就是checkout回去后，${AUTOREV}还是目前最新版的软件！）
# 使用externalsrc来直接编译源码目录下的代码，也可以不用每次都烦着更改SRCREV的值
SRCREV = "57341238a98b2752546b4de461f442dc4161f578"        

SRC_URI += "${MARVELL_M8887_URL};protocol=ssh;branch=${BRANCH}"

S = "${WORKDIR}/git"
WLAN_SRCDIR = "${S}/m8887/wlan"

module_do_compile() {
    # make marvell build-sys happy
    cd ${WLAN_SRCDIR}
    make
}

module_do_install() {
    install -d ${D}/lib/modules/${KERNEL_VERSION}/extra/
    install -d ${D}/etc/modprobe.d/
    install -m 644 ${WLAN_SRCDIR}/wlan.conf ${D}/etc/modprobe.d/wlan.conf
    install -m 644 ${WLAN_SRCDIR}/mlan.ko ${D}/lib/modules/${KERNEL_VERSION}/extra/
    install -m 644 ${WLAN_SRCDIR}/sd8xxx.ko ${D}/lib/modules/${KERNEL_VERSION}/extra/
}

PACKAGES += "kernel-module-mlan kernel-module-sd8xxx"

RDEPENDS_kernel-module-mlan_append = " marvell-m8887-fw-cal"
RDEPENDS_kernel-module-sd8xxx_append = " marvell-m8887-fw-cal"

FILES_${PN} += "\
    /etc/modprobe.d/ \
"

2. 使用externalsrc时刻编译最新代码，又不会影响编译旧版本软件

inherit externalsrc

# a dummy local SRC_URI entry, it is used to cheat kernel.class to prepare
# STAGING_KERNEL_DIR so building out-of-tree kernel module runs smoothly
SRC_URI_append = " file://foo"

EXTERNALSRC = "${TOPDIR}/../source_code/linux"
EXTERNALSRC_BUILD = "${WORKDIR}/build"

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