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fwup.conf
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# Firmware configuration file for the LinkIt Smart
#
# Firmware metadata
#
# All of these can be overriden using environment variables of the same name.
#
# Run 'fwup -m' to query values in a .fw file.
# Use 'fw_printenv' to query values on the target.
#
# These are used by Nerves libraries to introspect.
define(NERVES_FW_PRODUCT, "Nerves Firmware")
define(NERVES_FW_DESCRIPTION, "")
define(NERVES_FW_VERSION, "${NERVES_SDK_VERSION}")
define(NERVES_FW_PLATFORM, "linkit")
define(NERVES_FW_ARCHITECTURE, "mipsel")
define(NERVES_FW_AUTHOR, "The Nerves Team")
define(NERVES_FW_DEVPATH, "/dev/mmcblk0")
define(NERVES_FW_APPLICATION_PART0_DEVPATH, "/dev/mmcblk0p2") # Linux part number is 1-based
define(NERVES_FW_APPLICATION_PART0_FSTYPE, "ext4")
define(NERVES_FW_APPLICATION_PART0_TARGET, "/root")
# Default paths if not specified via the commandline
define(ROOTFS, "${NERVES_SYSTEM}/images/rootfs.squashfs")
# This configuration file will create an image that has an MBR and the
# following 3 partitions:
#
# +----------------------------+
# | MBR |
# +----------------------------+
# | p0*: Rootfs A (squashfs) |
# +----------------------------+
# | p0*: Rootfs B (squashfs) |
# +----------------------------+
# | p1: Application (ext4) |
# +----------------------------+
# | p2: Unused |
# +----------------------------+
# | p3: Unused |
# +----------------------------+
#
# The p0 partition points to whichever of Rootfs A or B that
# is active.
define(UBOOT_ENV_OFFSET, 16)
define(UBOOT_ENV_COUNT, 16) # 8 KB
# Let the rootfs have room to grow up to 64 MiB and align
# it to the nearest 1 MB boundary
define(ROOTFS_A_PART_OFFSET, 2048)
define(ROOTFS_A_PART_COUNT, 131072)
define-eval(ROOTFS_B_PART_OFFSET, "${ROOTFS_A_PART_OFFSET} + ${ROOTFS_A_PART_COUNT}")
define(ROOTFS_B_PART_COUNT, ${ROOTFS_A_PART_COUNT})
# Application partition
# NOTE: Keep the total amount used under 1.78 GiB so that
# everything fits in the "2 GB" eMMC.
define-eval(APP_PART_OFFSET, "${ROOTFS_B_PART_OFFSET} + ${ROOTFS_B_PART_COUNT}")
define(APP_PART_COUNT, 1048576)
# Firmware archive metadata
meta-product = ${NERVES_FW_PRODUCT}
meta-description = ${NERVES_FW_DESCRIPTION}
meta-version = ${NERVES_FW_VERSION}
meta-platform = ${NERVES_FW_PLATFORM}
meta-architecture = ${NERVES_FW_ARCHITECTURE}
meta-author = ${NERVES_FW_AUTHOR}
meta-vcs-identifier = ${NERVES_FW_VCS_IDENTIFIER}
meta-misc = ${NERVES_FW_MISC}
file-resource rootfs.img {
host-path = ${ROOTFS}
# Error out if the rootfs size exceeds the partition size
assert-size-lte = ${ROOTFS_A_PART_COUNT}
}
# See comment below in write-kernel
#file-resource uImage {
# host-path = "${NERVES_SYSTEM}/images/uImage"
# assert-size-lte = 30720 # 15 MiB
#}
mbr mbr-a {
partition 0 {
block-offset = ${ROOTFS_A_PART_OFFSET}
block-count = ${ROOTFS_A_PART_COUNT}
type = 0x83 # Linux
}
partition 1 {
block-offset = ${APP_PART_OFFSET}
block-count = ${APP_PART_COUNT}
type = 0x83 # Linux
}
# partition 2 and 3 are unused
}
mbr mbr-b {
partition 0 {
block-offset = ${ROOTFS_B_PART_OFFSET}
block-count = ${ROOTFS_B_PART_COUNT}
type = 0x83 # Linux
}
partition 1 {
block-offset = ${APP_PART_OFFSET}
block-count = ${APP_PART_COUNT}
type = 0x83 # Linux
}
# partition 2 and 3 are unused
}
# Location where installed firmware information is stored.
# While this is called "u-boot", u-boot isn't involved in this
# setup. It just provides a convenient key/value store format.
uboot-environment uboot-env {
block-offset = ${UBOOT_ENV_OFFSET}
block-count = ${UBOOT_ENV_COUNT}
}
# This firmware task writes everything to the destination media
task complete {
on-init {
mbr_write(mbr-a)
uboot_clearenv(uboot-env)
uboot_setenv(uboot-env, "nerves_fw_active", "a")
uboot_setenv(uboot-env, "nerves_fw_devpath", ${NERVES_FW_DEVPATH})
uboot_setenv(uboot-env, "a.nerves_fw_application_part0_devpath", ${NERVES_FW_APPLICATION_PART0_DEVPATH})
uboot_setenv(uboot-env, "a.nerves_fw_application_part0_fstype", ${NERVES_FW_APPLICATION_PART0_FSTYPE})
uboot_setenv(uboot-env, "a.nerves_fw_application_part0_target", ${NERVES_FW_APPLICATION_PART0_TARGET})
uboot_setenv(uboot-env, "a.nerves_fw_product", ${NERVES_FW_PRODUCT})
uboot_setenv(uboot-env, "a.nerves_fw_description", ${NERVES_FW_DESCRIPTION})
uboot_setenv(uboot-env, "a.nerves_fw_version", ${NERVES_FW_VERSION})
uboot_setenv(uboot-env, "a.nerves_fw_platform", ${NERVES_FW_PLATFORM})
uboot_setenv(uboot-env, "a.nerves_fw_architecture", ${NERVES_FW_ARCHITECTURE})
uboot_setenv(uboot-env, "a.nerves_fw_author", ${NERVES_FW_AUTHOR})
uboot_setenv(uboot-env, "a.nerves_fw_vcs_identifier", ${NERVES_FW_VCS_IDENTIFIER})
uboot_setenv(uboot-env, "a.nerves_fw_misc", ${NERVES_FW_MISC})
}
on-resource rootfs.img {
# write to the first rootfs partition
raw_write(${ROOTFS_A_PART_OFFSET})
}
on-finish {
# Clear out any old data in the B partition that might be mistaken for
# a file system. This is mostly to avoid confusion in humans when
# reprogramming SDCards with unknown contents.
raw_memset(${ROOTFS_B_PART_OFFSET}, 256, 0xff)
# Invalidate the application data partition so that it is guaranteed to
# trigger the corrupt filesystem detection code on first boot and get
# formatted. If this isn't done and an old SDCard is reused, the
# application data could be in a weird state.
raw_memset(${APP_PART_OFFSET}, 256, 0xff)
}
}
task upgrade.a {
# This task upgrades the A partition
require-partition-offset(0, ${ROOTFS_B_PART_OFFSET})
on-init {
info("Upgrading the A partition")
# Clear some firmware information just in case this update gets
# interrupted midway.
uboot_unsetenv(uboot-env, "a.nerves_fw_version")
}
on-resource rootfs.img { raw_write(${ROOTFS_A_PART_OFFSET}) }
on-finish {
# Update firmware metadata
uboot_setenv(uboot-env, "a.nerves_fw_application_part0_devpath", ${NERVES_FW_APPLICATION_PART0_DEVPATH})
uboot_setenv(uboot-env, "a.nerves_fw_application_part0_fstype", ${NERVES_FW_APPLICATION_PART0_FSTYPE})
uboot_setenv(uboot-env, "a.nerves_fw_application_part0_target", ${NERVES_FW_APPLICATION_PART0_TARGET})
uboot_setenv(uboot-env, "a.nerves_fw_product", ${NERVES_FW_PRODUCT})
uboot_setenv(uboot-env, "a.nerves_fw_description", ${NERVES_FW_DESCRIPTION})
uboot_setenv(uboot-env, "a.nerves_fw_version", ${NERVES_FW_VERSION})
uboot_setenv(uboot-env, "a.nerves_fw_platform", ${NERVES_FW_PLATFORM})
uboot_setenv(uboot-env, "a.nerves_fw_architecture", ${NERVES_FW_ARCHITECTURE})
uboot_setenv(uboot-env, "a.nerves_fw_author", ${NERVES_FW_AUTHOR})
uboot_setenv(uboot-env, "a.nerves_fw_vcs_identifier", ${NERVES_FW_VCS_IDENTIFIER})
uboot_setenv(uboot-env, "a.nerves_fw_misc", ${NERVES_FW_MISC})
# Switch over to boot the new firmware
uboot_setenv(uboot-env, "nerves_fw_active", "a")
mbr_write(mbr-a)
}
on-error {
}
}
task upgrade.b {
# This task upgrades the B partition
require-partition-offset(0, ${ROOTFS_A_PART_OFFSET})
on-init {
info("Upgrading the B partition")
# Clear some firmware information just in case this update gets
# interrupted midway.
uboot_unsetenv(uboot-env, "b.nerves_fw_version")
}
on-resource rootfs.img { raw_write(${ROOTFS_B_PART_OFFSET}) }
on-finish {
# Update firmware metadata
uboot_setenv(uboot-env, "b.nerves_fw_application_part0_devpath", ${NERVES_FW_APPLICATION_PART0_DEVPATH})
uboot_setenv(uboot-env, "b.nerves_fw_application_part0_fstype", ${NERVES_FW_APPLICATION_PART0_FSTYPE})
uboot_setenv(uboot-env, "b.nerves_fw_application_part0_target", ${NERVES_FW_APPLICATION_PART0_TARGET})
uboot_setenv(uboot-env, "b.nerves_fw_product", ${NERVES_FW_PRODUCT})
uboot_setenv(uboot-env, "b.nerves_fw_description", ${NERVES_FW_DESCRIPTION})
uboot_setenv(uboot-env, "b.nerves_fw_version", ${NERVES_FW_VERSION})
uboot_setenv(uboot-env, "b.nerves_fw_platform", ${NERVES_FW_PLATFORM})
uboot_setenv(uboot-env, "b.nerves_fw_architecture", ${NERVES_FW_ARCHITECTURE})
uboot_setenv(uboot-env, "b.nerves_fw_author", ${NERVES_FW_AUTHOR})
uboot_setenv(uboot-env, "b.nerves_fw_vcs_identifier", ${NERVES_FW_VCS_IDENTIFIER})
uboot_setenv(uboot-env, "b.nerves_fw_misc", ${NERVES_FW_MISC})
# Switch over to boot the new firmware
uboot_setenv(uboot-env, "nerves_fw_active", "b")
mbr_write(mbr-b)
}
on-error {
}
}
task upgrade.unexpected {
on-init {
error("Please check the media being upgraded. It doesn't look like either the A or B partitions are active.")
}
}
# The kernel is being included in /boot now. This isn't ideal since
# it's still not possible to upgrade the rootfs and kernel together.
# However, rather than including the kernel twice and bloating the
# firmware file, we run `dd if=/boot/uImage of=/dev/mtdblock3 bs=1M`
# manually if the kernel ever needs to be updated.
#task write_kernel {
# on-resource uImage {
# # It is expected that this is pointed at /dev/mtdblock3
# raw_write(0)
# }
#}