1DESCRIPTION = "Linux Kernel for Raspberry Pi"
2SECTION = "kernel"
3LICENSE = "GPLv2"
4LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
5
6COMPATIBLE_MACHINE = "^rpi$"
7
8PE = "1"
9PV = "${LINUX_VERSION}+git${SRCPV}"
10
11inherit kernel siteinfo
12require recipes-kernel/linux/linux-yocto.inc
13
14KCONFIG_MODE = "--alldefconfig"
15KBUILD_DEFCONFIG_raspberrypi0-wifi ?= "bcmrpi_defconfig"
16KBUILD_DEFCONFIG_raspberrypi ?= "bcmrpi_defconfig"
17KBUILD_DEFCONFIG_raspberrypi2 ?= "bcm2709_defconfig"
18KBUILD_DEFCONFIG_raspberrypi3 ?= "bcm2709_defconfig"
19KBUILD_DEFCONFIG_raspberrypi3-64 ?= "bcmrpi3_defconfig"
20
21# CMDLINE for raspberrypi
22SERIAL = "${@oe.utils.conditional("ENABLE_UART", "1", "console=serial0,115200", "", d)}"
23CMDLINE ?= "dwc_otg.lpm_enable=0 ${SERIAL} root=/dev/mmcblk0p2 rootfstype=ext4 rootwait"
24
25# Add the kernel debugger over console kernel command line option if enabled
26CMDLINE_append = ' ${@oe.utils.conditional("ENABLE_KGDB", "1", "kgdboc=serial0,115200", "", d)}'
27
28# Disable rpi logo on boot
29CMDLINE_append += ' ${@oe.utils.conditional("DISABLE_RPI_BOOT_LOGO", "1", "logo.nologo", "", d)}'
30
31# You can define CMDLINE_DEBUG as "debug" in your local.conf or distro.conf
32# to enable kernel debugging.
33CMDLINE_DEBUG ?= ""
34CMDLINE_append = " ${CMDLINE_DEBUG}"
35
36KERNEL_INITRAMFS ?= '${@oe.utils.conditional("INITRAMFS_IMAGE_BUNDLE", "1", "1", "", d)}'
37
38KERNEL_MODULE_AUTOLOAD += "${@bb.utils.contains("MACHINE_FEATURES", "pitft28r", "stmpe-ts", "", d)}"
39
40# A LOADADDR is needed when building a uImage format kernel. This value is not
41# set by default in rpi-4.8.y and later branches so we need to provide it
42# manually. This value unused if KERNEL_IMAGETYPE is not uImage.
43KERNEL_EXTRA_ARGS += "LOADADDR=0x00008000"
44
45# Set a variable in .configure
46# $1 - Configure variable to be set
47# $2 - value [n/y/value]
48kernel_configure_variable() {
49    # Remove the config
50    CONF_SED_SCRIPT="$CONF_SED_SCRIPT /CONFIG_$1[ =]/d;"
51    if test "$2" = "n"
52    then
53        echo "# CONFIG_$1 is not set" >> ${B}/.config
54    else
55        echo "CONFIG_$1=$2" >> ${B}/.config
56    fi
57}
58
59config_setup() {
60    # From kernel.bbclass. Unfortunately, this is needed to support builds that
61    # use devtool. The reason is as follows:
62    #
63    # - In devtool builds, externalsrc.bbclass gets inherited and sets a list of
64    # SRCTREECOVEREDTASKS, which don't get run because they affect the source
65    # tree and, when using devtool, we want the developer's changes to be the
66    # single source of truth. kernel-yocto.bbclass adds do_kernel_configme to
67    # SRCTREECOVEREDTASKS, so it doesn't run in a devtool build., In a normal
68    # non-devtool build, do_kernel_configme creates ${B}.config.
69    #
70    # - Normally (e.g. in linux-yocto), it would be OK that do_kernel_configme
71    # doesn't run, because the first few lines of do_configure in kernel.bbclass
72    # populate ${B}.config from either ${S}.config (if it exists) for custom
73    # developer changes, or otherwise from ${WORDIR}/defconfig.
74    #
75    # - In linux-raspberrypi, we add do_configure_prepend, which tweaks
76    # ${B}.config. Since this runs *before* the kernel.bbclass do_configure,
77    # ${B}.config doesn't yet exist and we hit an error. Thus we need to move
78    # the logic from do_configure up to before our do_configure_prepend. Because
79    # we are copying only a portion of do_configure and not the whole thing,
80    # there is no clean way to do it using OE functionality, so we just
81    # copy-and-paste.
82    if [ "${S}" != "${B}" ] && [ -f "${S}/.config" ] && [ ! -f "${B}/.config" ]; then
83        mv "${S}/.config" "${B}/.config"
84    fi
85
86    # Copy defconfig to .config if .config does not exist. This allows
87    # recipes to manage the .config themselves in do_configure_prepend().
88    if [ -f "${WORKDIR}/defconfig" ] && [ ! -f "${B}/.config" ]; then
89        cp "${WORKDIR}/defconfig" "${B}/.config"
90    fi
91}
92
93do_configure_prepend() {
94    config_setup
95
96    mv -f ${B}/.config ${B}/.config.patched
97    CONF_SED_SCRIPT=""
98
99    # Localversion
100    kernel_configure_variable LOCALVERSION "\"\""
101
102    if [ ! -z "${KERNEL_INITRAMFS}" ]; then
103        kernel_configure_variable OVERLAY_FS y
104        kernel_configure_variable SQUASHFS y
105        kernel_configure_variable UBIFS_FS y
106    fi
107
108    # Activate the configuration options for VC4
109    VC4GRAPHICS="${@bb.utils.contains("MACHINE_FEATURES", "vc4graphics", "1", "0", d)}"
110    if [ ${VC4GRAPHICS} = "1" ]; then
111        kernel_configure_variable I2C_BCM2835 y
112        kernel_configure_variable DRM y
113        kernel_configure_variable DRM_FBDEV_EMULATION y
114        kernel_configure_variable DRM_VC4 y
115    fi
116
117    # Keep this the last line
118    # Remove all modified configs and add the rest to .config
119    sed -e "${CONF_SED_SCRIPT}" < '${B}/.config.patched' >> '${B}/.config'
120    rm -f ${B}/.config.patched
121}
122
123do_compile_append_raspberrypi3-64() {
124    cc_extra=$(get_cc_option)
125    oe_runmake dtbs CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}
126}
127
128do_deploy_append() {
129    # Deploy cmdline.txt
130    install -d ${DEPLOYDIR}/bcm2835-bootfiles
131    PITFT="${@bb.utils.contains("MACHINE_FEATURES", "pitft", "1", "0", d)}"
132    if [ ${PITFT} = "1" ]; then
133        PITFT_PARAMS="fbcon=map:10 fbcon=font:VGA8x8"
134    fi
135    echo "${CMDLINE}${PITFT_PARAMS}" > ${DEPLOYDIR}/bcm2835-bootfiles/cmdline.txt
136}
137