aboutsummaryrefslogtreecommitdiffstats
path: root/classes/sdcard_image-rpi.bbclass
blob: 56a854e038ae232361f5bbbbee2c3b9e59787ad5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
inherit image_types
inherit linux-raspberrypi-base

#
# Create an image that can by written onto a SD card using dd.
#
# The disk layout used is:
#
#    0                      -> IMAGE_ROOTFS_ALIGNMENT         - reserved for other data
#    IMAGE_ROOTFS_ALIGNMENT -> BOOT_SPACE                     - bootloader and kernel
#    BOOT_SPACE             -> SDIMG_SIZE                     - rootfs
#

#                                                     Default Free space = 1.3x
#                                                     Use IMAGE_OVERHEAD_FACTOR to add more space
#                                                     <--------->
#            4MiB              40MiB           SDIMG_ROOTFS
# <-----------------------> <----------> <---------------------->
#  ------------------------ ------------ ------------------------
# | IMAGE_ROOTFS_ALIGNMENT | BOOT_SPACE | ROOTFS_SIZE            |
#  ------------------------ ------------ ------------------------
# ^                        ^            ^                        ^
# |                        |            |                        |
# 0                      4MiB     4MiB + 40MiB       4MiB + 40Mib + SDIMG_ROOTFS

# This image depends on the rootfs image
IMAGE_TYPEDEP_rpi-sdimg = "${SDIMG_ROOTFS_TYPE}"

# Set kernel and boot loader
IMAGE_BOOTLOADER ?= "bcm2835-bootfiles"

# Set initramfs extension
KERNEL_INITRAMFS ?= ""

# Kernel image name
SDIMG_KERNELIMAGE_raspberrypi  ?= "kernel.img"
SDIMG_KERNELIMAGE_raspberrypi2 ?= "kernel7.img"
SDIMG_KERNELIMAGE_raspberrypi3-64 ?= "kernel8.img"

# Boot partition volume id
BOOTDD_VOLUME_ID ?= "${MACHINE}"

# Boot partition size [in KiB] (will be rounded up to IMAGE_ROOTFS_ALIGNMENT)
BOOT_SPACE ?= "40960"

# Set alignment to 4MB [in KiB]
IMAGE_ROOTFS_ALIGNMENT = "4096"

# Use an uncompressed ext3 by default as rootfs
SDIMG_ROOTFS_TYPE ?= "ext3"
SDIMG_ROOTFS = "${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.${SDIMG_ROOTFS_TYPE}"

IMAGE_DEPENDS_rpi-sdimg = " \
			parted-native \
			mtools-native \
			dosfstools-native \
			virtual/kernel:do_deploy \
			${IMAGE_BOOTLOADER} \
			${@bb.utils.contains('KERNEL_IMAGETYPE', 'uImage', 'u-boot', '',d)} \
			"

# SD card image name
SDIMG = "${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.rpi-sdimg"

# Compression method to apply to SDIMG after it has been created. Supported
# compression formats are "gzip", "bzip2" or "xz". The original .rpi-sdimg file
# is kept and a new compressed file is created if one of these compression
# formats is chosen. If SDIMG_COMPRESSION is set to any other value it is
# silently ignored.
#SDIMG_COMPRESSION ?= ""

# Additional files and/or directories to be copied into the vfat partition from the IMAGE_ROOTFS.
FATPAYLOAD ?= ""

# SD card vfat partition image name
SDIMG_VFAT = "${IMAGE_NAME}.vfat"
SDIMG_LINK_VFAT = "${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.vfat"

IMAGE_CMD_rpi-sdimg () {

	# Align partitions
	BOOT_SPACE_ALIGNED=$(expr ${BOOT_SPACE} + ${IMAGE_ROOTFS_ALIGNMENT} - 1)
	BOOT_SPACE_ALIGNED=$(expr ${BOOT_SPACE_ALIGNED} - ${BOOT_SPACE_ALIGNED} % ${IMAGE_ROOTFS_ALIGNMENT})
	SDIMG_SIZE=$(expr ${IMAGE_ROOTFS_ALIGNMENT} + ${BOOT_SPACE_ALIGNED} + $ROOTFS_SIZE)

	echo "Creating filesystem with Boot partition ${BOOT_SPACE_ALIGNED} KiB and RootFS $ROOTFS_SIZE KiB"

	# Check if we are building with device tree support
	DTS="${@get_dts(d)}"

	# Initialize sdcard image file
	dd if=/dev/zero of=${SDIMG} bs=1024 count=0 seek=${SDIMG_SIZE}

	# Create partition table
	parted -s ${SDIMG} mklabel msdos
	# Create boot partition and mark it as bootable
	parted -s ${SDIMG} unit KiB mkpart primary fat32 ${IMAGE_ROOTFS_ALIGNMENT} $(expr ${BOOT_SPACE_ALIGNED} \+ ${IMAGE_ROOTFS_ALIGNMENT})
	parted -s ${SDIMG} set 1 boot on
	# Create rootfs partition to the end of disk
	parted -s ${SDIMG} -- unit KiB mkpart primary ext2 $(expr ${BOOT_SPACE_ALIGNED} \+ ${IMAGE_ROOTFS_ALIGNMENT}) -1s
	parted ${SDIMG} print

	# Create a vfat image with boot files
	BOOT_BLOCKS=$(LC_ALL=C parted -s ${SDIMG} unit b print | awk '/ 1 / { print substr($4, 1, length($4 -1)) / 512 /2 }')
	rm -f ${WORKDIR}/boot.img
	mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
	mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles/* ::/
	if test -n "${DTS}"; then
		# Device Tree Overlays are assumed to be suffixed by '-overlay.dtb' (4.1.x) or by '.dtbo' (4.4.9+) string and will be put in a dedicated folder
		DT_OVERLAYS="${@split_overlays(d, 0)}"
		DT_ROOT="${@split_overlays(d, 1)}"

		# Copy board device trees to root folder
		for DTB in $DT_ROOT; do
			DTB_BASE_NAME=`basename ${DTB} .dtb`

			mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${DTB_BASE_NAME}.dtb ::${DTB_BASE_NAME}.dtb
		done

		# Copy device tree overlays to dedicated folder
		mmd -i ${WORKDIR}/boot.img overlays
		for DTB in $DT_OVERLAYS; do
				DTB_EXT=${DTB##*.}
				DTB_BASE_NAME=`basename ${DTB} ."${DTB_EXT}"`

			mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${DTB_BASE_NAME}.${DTB_EXT} ::overlays/${DTB_BASE_NAME}.${DTB_EXT}
		done
	fi
	case "${KERNEL_IMAGETYPE}" in
	"uImage")
		mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/u-boot.bin ::${SDIMG_KERNELIMAGE}
		mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}${KERNEL_INITRAMFS}-${MACHINE}.bin ::uImage
		mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/boot.scr ::boot.scr
		;;
	*)
		mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}${KERNEL_INITRAMFS}-${MACHINE}.bin ::${SDIMG_KERNELIMAGE}
		;;
	esac

	if [ -n ${FATPAYLOAD} ] ; then
		echo "Copying payload into VFAT"
		for entry in ${FATPAYLOAD} ; do
				# add the || true to stop aborting on vfat issues like not supporting .~lock files
				mcopy -i ${WORKDIR}/boot.img -s -v ${IMAGE_ROOTFS}$entry :: || true
		done
	fi

	# Add stamp file
	echo "${IMAGE_NAME}" > ${WORKDIR}/image-version-info
	mcopy -i ${WORKDIR}/boot.img -v ${WORKDIR}/image-version-info ::

        # Deploy vfat partition (for u-boot case only)
        case "${KERNEL_IMAGETYPE}" in
        "uImage")
                cp ${WORKDIR}/boot.img ${IMGDEPLOYDIR}/${SDIMG_VFAT}
                ln -sf ${SDIMG_VFAT} ${SDIMG_LINK_VFAT}
                ;;
        *)
                ;;
        esac

	# Burn Partitions
	dd if=${WORKDIR}/boot.img of=${SDIMG} conv=notrunc seek=1 bs=$(expr ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync && sync
	# If SDIMG_ROOTFS_TYPE is a .xz file use xzcat
	if echo "${SDIMG_ROOTFS_TYPE}" | egrep -q "*\.xz"
	then
		xzcat ${SDIMG_ROOTFS} | dd of=${SDIMG} conv=notrunc seek=1 bs=$(expr 1024 \* ${BOOT_SPACE_ALIGNED} + ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync && sync
	else
		dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=$(expr 1024 \* ${BOOT_SPACE_ALIGNED} + ${IMAGE_ROOTFS_ALIGNMENT} \* 1024) && sync && sync
	fi

	# Optionally apply compression
	case "${SDIMG_COMPRESSION}" in
	"gzip")
		gzip -k9 "${SDIMG}"
		;;
	"bzip2")
		bzip2 -k9 "${SDIMG}"
		;;
	"xz")
		xz -k "${SDIMG}"
		;;
	esac
}

ROOTFS_POSTPROCESS_COMMAND += " rpi_generate_sysctl_config ; "

rpi_generate_sysctl_config() {
	# systemd sysctl config
	test -d ${IMAGE_ROOTFS}${sysconfdir}/sysctl.d && \
		echo "vm.min_free_kbytes = 8192" > ${IMAGE_ROOTFS}${sysconfdir}/sysctl.d/rpi-vm.conf

	# sysv sysctl config
	IMAGE_SYSCTL_CONF="${IMAGE_ROOTFS}${sysconfdir}/sysctl.conf"
	test -e ${IMAGE_ROOTFS}${sysconfdir}/sysctl.conf && \
		sed -e "/vm.min_free_kbytes/d" -i ${IMAGE_SYSCTL_CONF}
	echo "" >> ${IMAGE_SYSCTL_CONF} && echo "vm.min_free_kbytes = 8192" >> ${IMAGE_SYSCTL_CONF}
}