nerves_system_srhub

# Custom U-Boot environment

# This script is invoked from the built-in u-boot script.
# It has been simplified to just support the SmartRent Hub.

#
# Nerves variables
#

nerves_fw_active=a

# nerves_fw_autovalidate controls whether updates are considered valid once
# applied. If set to 0, the user needs to set nerves_fw_validated to 1 in their
# application. If they don't set it before a reboot, then the previous software
# is run. If 1, then no further action needs to be taken.
nerves_fw_autovalidate=0

# nerves_fw_validated is 1 if the current boot selection is accepted It is set
# to 1 here, since this environment is written in the factory, so it is
# implicitly valid.
nerves_fw_validated=1

# nerves_fw_booted is 0 for the first boot and 1 for all reboots after that.
# NOTE: Keep this '0' so that all new boards run a 'saveenv' to exercise the
#       code that writes back to the eMMC early on.
nerves_fw_booted=0

# The nerves initialization logic
#
# The nerves_init code is run at boot (see the last line of the file). It
# checks whether this is a first boot or not. If it's not the first boot, then
# the firmware better be validated or it reverts to running the firmware on
# the opposite partition.
nerves_revert=\
    if test ${nerves_fw_active} = "a"; then\
        echo "Reverting to partition B";\
        setenv nerves_fw_active "b";\
    else\
        echo "Reverting to partition A";\
        setenv nerves_fw_active "a";\
    fi

nerves_init=\
    if test ${nerves_fw_booted} = 1; then\
        if test ${nerves_fw_validated} = 0; then\
            run nerves_revert;\
            setenv nerves_fw_validated 1;\
            saveenv;\
        fi;\
    else\
        setenv nerves_fw_booted 1;\
        if test ${nerves_fw_autovalidate} = 1; then\
            setenv nerves_fw_validated 1;\
        fi;\
        saveenv;\
    fi;\
    setenv bootfile zImage.${nerves_fw_active};\
    if test ${nerves_fw_active} = "a"; then\
        setenv uenv_root /dev/mmcblk0p2;\
        setenv bootpart 0:2;\
    else\
        setenv uenv_root /dev/mmcblk0p3;\
        setenv bootpart 0:3;\
    fi
#
# Linux commandline:
#
# coherent_pool=1M          - copied from Beaglebone defaults. It's needed for some WiFi drivers.
# net.ifnames=0             - copied from Beaglebone defaults
# omap_wdt.early_enable=1   - turn on the internal watchdog timer asap
# omap_wdt.timer_margin=120 - Erlang heart has 120 seconds to start petting the timer
# console=ttyS0,115200n8    - Turn on debug UART via test points
# quiet                     - limit kernel prints to the console
cmdline=coherent_pool=1M net.ifnames=0 omap_wdt.early_enable=1 omap_wdt.timer_margin=120 console=ttyS0,115200n8 quiet

fdtfile=am335x-smartrent-hub.dtb

fdtaddr=0x88000000
loadaddr=0x82000000

mmcargs=setenv bootargs ${cmdline} root=${uenv_root} rootfstype=squashfs rootwait

mmc_loadfdt=load mmc ${bootpart} ${fdtaddr} /boot/${fdtfile}
mmc_loadk=fatload mmc 0:1 ${loadaddr} /zImage.${nerves_fw_active}

led_red=gpio clear 115;gpio set 116
#led_green=gpio set 115;gpio clear 116

# Flash the lights yellow very briefly and then switch to solid red. Linux will
# blink the LEDs. If Linux doesn't boot, then the lights remain solid red and
# that indicates a boot issue.
bootcmd=run led_red;run nerves_init mmcargs; if run mmc_loadk; then if run mmc_loadfdt; then bootz ${loadaddr} - ${fdtaddr}; fi; fi