bootscr.uboot-generic

% cat bootscr.uboot-generic
# Bootscript using the new unified bootcmd handling
# introduced with u-boot v2014.10
#
# Expects to be called with the following environment variables set:
#
#  devtype              e.g. mmc/scsi etc
#  devnum               The device number of the given type
#  bootpart             The partition containing the boot files
#  distro_bootpart      The partition containing the boot files
#                       (introduced in u-boot mainline 2016.01)
#  prefix               Prefix within the boot partiion to the boot files
#  kernel_addr_r        Address to load the kernel to
#  fdt_addr_r           Address to load the FDT to
#  ramdisk_addr_r       Address to load the initrd to.
#
# The uboot must support the @@BOOT_CMD@@ and generic filesystem load commands.

# Workaround lack of baudrate included with console on various iMX
# systems (e.g. wandboard, cubox-i, hummingboard)
if test "${console}" = "ttymxc0" && test -n "${baudrate}"; then
  setenv console "${console},${baudrate}"
fi

if test -n "${console}"; then
  setenv bootargs "${bootargs} console=${console}"
fi

setenv bootargs "@@LINUX_KERNEL_CMDLINE_DEFAULTS@@ ${bootargs} @@LINUX_KERNEL_CMDLINE@@"
@@UBOOT_ENV_EXTRA@@

if test -z "${fk_kvers}"; then
   setenv fk_kvers '@@KERNEL_VERSION@@'
fi

# These two blocks should be the same apart from the use of
# ${fk_kvers} in the first, the syntax supported by u-boot does not
# lend itself to removing this duplication.

if test -n "${fdtfile}"; then
   setenv fdtpath dtbs/${fk_kvers}/${fdtfile}
else
   setenv fdtpath dtb-${fk_kvers}
fi

if test -z "${distro_bootpart}"; then
  setenv partition ${bootpart}
else
  setenv partition ${distro_bootpart}
fi

@@UBOOT_PREBOOT_EXTRA@@

if test -z "${fk_image_locations}"; then
  setenv fk_image_locations ${prefix}
fi

for pathprefix in ${fk_image_locations}
do
  if test -e ${devtype} ${devnum}:${partition} ${pathprefix}vmlinuz-${fk_kvers}
  then
    load ${devtype} ${devnum}:${partition} ${kernel_addr_r} ${pathprefix}vmlinuz-${fk_kvers} \
    && load ${devtype} ${devnum}:${partition} ${fdt_addr_r} ${pathprefix}${fdtpath} \
    && load ${devtype} ${devnum}:${partition} ${ramdisk_addr_r} ${pathprefix}initrd.img-${fk_kvers} \
    && echo "Booting Debian ${fk_kvers} from ${devtype} ${devnum}:${partition}..." \
    && @@BOOT_CMD@@ ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r}
  fi
done

for pathprefix in ${fk_image_locations}
do
  if test -e ${devtype} ${devnum}:${partition} ${pathprefix}vmlinuz
  then
    load ${devtype} ${devnum}:${partition} ${kernel_addr_r} ${pathprefix}vmlinuz \
    && load ${devtype} ${devnum}:${partition} ${fdt_addr_r} ${pathprefix}dtb \
    && load ${devtype} ${devnum}:${partition} ${ramdisk_addr_r} ${pathprefix}initrd.img \
    && echo "Booting Debian from ${devtype} ${devnum}:${partition}..." \
    && @@BOOT_CMD@@ ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r}
  fi
done