Add support for a ARMv7 machine supporting multiple Raspberry Pi boards

The new raspberrypi-armv7.conf aims at supporting all the ARMv7
Raspberry Pi boards.

This initial support was tested on:
* Raspberry Pi 4 Model B
* Raspberry Pi 3 Model B
* Raspberry Pi 0 2 WiFi

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

conf/machine/include/rpi-default-versions.inc

@@ -1,3 +1,4 @@
 # RaspberryPi BSP default versions
 
 PREFERRED_VERSION_linux-raspberrypi ??= "5.15.%"
+PREFERRED_VERSION_linux-raspberrypi-v7 ??= "${PREFERRED_VERSION_linux-raspberrypi}"

conf/machine/raspberrypi-armv7.conf

@@ -0,0 +1,39 @@
+# SPDX-FileCopyrightText: Andrei Gherzan <andrei.gherzan@huawei.com>
+#
+# SPDX-License-Identifier: MIT
+
+#@TYPE: Machine
+#@NAME: RaspberryPi Development Boards (32bit)
+#@DESCRIPTION: Machine configuration for the RaspberryPi boards in 32 bit mode
+
+DEFAULTTUNE ?= "cortexa7thf-neon-vfpv4"
+require conf/machine/include/arm/armv7a/tune-cortexa7.inc
+include conf/machine/include/rpi-base.inc
+
+# This machine includes by default the kernel for v7l. We hook in support for
+# v7.
+RASPBERRYPI_v7_KERNEL = "linux-raspberrypi-v7"
+RASPBERRYPI_v7_KERNEL_PACKAGE_NAME = "kernel-v7"
+RASPBERRYPI_v7_KERNEL_FILE ?= "kernel7.img"
+# We don't need a lot for v7l because it is the default provider,
+# virtual/kernel.
+RASPBERRYPI_v7l_KERNEL_FILE ?= "kernel7l.img"
+
+MACHINE_FEATURES += "pci"
+MACHINE_EXTRA_RRECOMMENDS += "\
+    linux-firmware-rpidistro-bcm43430 \
+    linux-firmware-rpidistro-bcm43436 \
+    linux-firmware-rpidistro-bcm43436s \
+    linux-firmware-rpidistro-bcm43455 \
+    linux-firmware-rpidistro-bcm43456 \
+    bluez-firmware-rpidistro-bcm43430a1-hcd \
+    bluez-firmware-rpidistro-bcm43430b0-hcd \
+    bluez-firmware-rpidistro-bcm4345c0-hcd \
+    bluez-firmware-rpidistro-bcm4345c5-hcd \
+"
+
+# FIXME: This machine doesn't support u-boot (yet)
+RPI_EXTRA_IMAGE_BOOT_FILES = " \
+	${KERNEL_IMAGETYPE};${RASPBERRYPI_v7l_KERNEL_FILE} \
+	${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}/${KERNEL_IMAGETYPE};${RASPBERRYPI_v7_KERNEL_FILE} \
+"

docs/layer-contents.md

@@ -16,6 +16,22 @@
 
 Note: The raspberrypi3 machines include support for Raspberry Pi 3B+.
 
+## Multi-board Machines
+
+This layer generally provides support for machines that are targetting a single
+Raspberry Pi board (or a very few subsets of them). This is so that the build
+infrastructure can tune and tweak the configuration with the flexibility to
+optimise for both runtime performance and disk storage.
+
+For usecases where compatibility of more boards is required, the layer provides
+machines that are tagetting a wider support of Raspberry Pi boards.
+
+### raspberrypi-armv7
+
+This machine targets support for all the ARMv7-based Raspberry Pi boards. It
+will pull in the firmware and deploy the kernel image and kernel modules for
+all the relevant boards.
+
 ## Images
 
 * rpi-test-image

recipes-kernel/linux/linux-raspberrypi-v7.inc

@@ -0,0 +1,13 @@
+# SPDX-FileCopyrightText: Andrei Gherzan <andrei.gherzan@huawei.com>
+#
+# SPDX-License-Identifier: MIT
+
+KBUILD_DEFCONFIG:raspberrypi-armv7 = "bcm2709_defconfig"
+KERNEL_PACKAGE_NAME = "${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}"
+PROVIDES:remove = "virtual/kernel"
+
+KERNEL_IMAGETYPE_DIRECT ?= "zImage"
+
+COMPATIBLE_MACHINE = "^raspberrypi-armv7$"
+
+KERNEL_DEVICETREE = ""

recipes-kernel/linux/linux-raspberrypi-v7_5.10.bb

@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: Andrei Gherzan <andrei.gherzan@huawei.com>
+#
+# SPDX-License-Identifier: MIT
+
+require linux-raspberrypi-v7.inc
+require linux-raspberrypi_5.10.bb

recipes-kernel/linux/linux-raspberrypi-v7_5.15.bb

@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: Andrei Gherzan <andrei.gherzan@huawei.com>
+#
+# SPDX-License-Identifier: MIT
+
+require linux-raspberrypi-v7.inc
+require linux-raspberrypi_5.15.bb

recipes-kernel/linux/linux-raspberrypi.inc

@@ -26,6 +26,7 @@ KBUILD_DEFCONFIG:raspberrypi3 ?= "bcm2709_defconfig"
 KBUILD_DEFCONFIG:raspberrypi3-64 ?= "bcmrpi3_defconfig"
 KBUILD_DEFCONFIG:raspberrypi4 ?= "bcm2711_defconfig"
 KBUILD_DEFCONFIG:raspberrypi4-64 ?= "bcm2711_defconfig"
+KBUILD_DEFCONFIG:raspberrypi-armv7 ?= "bcm2711_defconfig"
 
 LINUX_VERSION_EXTENSION ?= ""
 

recipes-kernel/linux/linux-raspberrypi_5.15.bb

@@ -17,3 +17,15 @@ SRC_URI = " \
 require linux-raspberrypi.inc
 
 KERNEL_DTC_FLAGS += "-@ -H epapr"
+
+RDEPENDS:${KERNEL_PACKAGE_NAME}:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}"
+RDEPENDS:${KERNEL_PACKAGE_NAME}-base:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}-base"
+RDEPENDS:${KERNEL_PACKAGE_NAME}-image:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}-image"
+RDEPENDS:${KERNEL_PACKAGE_NAME}-dev:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}-dev"
+RDEPENDS:${KERNEL_PACKAGE_NAME}-vmlinux:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}-vmlinux"
+RDEPENDS:${KERNEL_PACKAGE_NAME}-modules:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}-modules"
+RDEPENDS:${KERNEL_PACKAGE_NAME}-dbg:raspberrypi-armv7:append = " ${RASPBERRYPI_v7_KERNEL_PACKAGE_NAME}-dbg"
+
+DEPLOYDEP = ""
+DEPLOYDEP:raspberrypi-armv7 = "${RASPBERRYPI_v7_KERNEL}:do_deploy"
+do_deploy[depends] += "${DEPLOYDEP}"