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imx6: bootscript: use partition UUID for rootfs if possible

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Specifying root filesystem by device is non-deterministic for several
reasons:
 - USB device unmeration order is not garunteeed for USB storage devs
 - MMC devs ordering is determined by the instance of the MMC host
   controller including non-storage SDIO devices which can throw off
   numbering depending on kernel versions.

It is recommended to use partition UUID

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2020-04-01 10:23:12 -07:00 committed by Petr Štetiar
parent 4298339b23
commit ff6b092121
1 changed files with 20 additions and 14 deletions
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34
target/linux/imx6/image/bootscript-ventana
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@ -1,4 +1,4 @@
echo "Gateworks Ventana OpenWrt Boot script v1.01"
echo "Gateworks Ventana OpenWrt Boot script v1.02"
# set some defaults
# set some defaults
@ -9,7 +9,7 @@ setenv bootargs console=${console},${baudrate}
setenv loadaddr 10800000
setenv fdt_addr 18000000
# detect dtype and bootdev by looking for kernel on media the bootloader
# detect dtype by looking for kernel on media the bootloader
# has mounted (in order of preference: usb/mmc/sata)
#
# This assumes the bootloader has already started the respective subsystem
@ -31,18 +31,9 @@ else
fi
echo "detected dtype:$dtype"
fi
if test -n "$bootdev" ; then
echo "Using bootdev from env: $bootdev"
else
if itest.s "x${dtype}" == "xmmc" ; then
bootdev=mmcblk0p1
else
bootdev=sda1
fi
fi
echo "Booting from ${dtype}..."
if itest.s "x${dtype}" == "xnand" ; then
echo "Booting from NAND..."
# fix partition name
# OpenWrt kernel bug prevents partition name of 'rootfs' from booting
# instead name the partition ubi which is what is looked for by
@ -52,9 +43,24 @@ if itest.s "x${dtype}" == "xnand" ; then
setenv fsload ubifsload
setenv root "ubi0:ubi ubi.mtd=2 rootfstype=squashfs,ubifs"
else
echo "Booting from block device ${bootdev}..."
setenv fsload "${fs}load ${dtype} ${disk}:1"
setenv root "root=/dev/${bootdev} rootfstype=${fs} rootwait rw"
part uuid ${dtype} ${disk}:1 uuid
if test -z "${uuid}"; then
# fallback to bootdev
if test -n "$bootdev" ; then
echo "Using bootdev from env: $bootdev"
else
if itest.s "x${dtype}" == "xmmc" ; then
bootdev=mmcblk0p1
else
bootdev=sda1
fi
fi
setenv root "root=/dev/${bootdev}"
else
setenv root "root=PARTUUID=${uuid}"
fi
setenv root "$root rootfstype=${fs} rootwait rw"
fi
setenv bootargs "${bootargs}" "${root}" "${video}" "${extra}"