Hi!
librerouterOS used to be based on OpenWrt 19
librerouterOS is basically plain OpenWrt plus safe-upgrade,
safe-upgrade is a mechanism to flash an updated firmware to a second
partition and mark it as testing, so if something goes wrong and user
doesn't confirm everything is ok, after a while it reboot from the first
partition, support for flashing a second partition and booting from
there, to do this safe-upgrade basically does a bit of U-Boot trickery and
pass to kernel command line
mtdparts=spi0.0:256k(u-boot),64k(u-boot-env),7936k(firmware),7936k(fw2),128k(res),64k(ART)
to boot from first partition, while
mtdparts=spi0.0:256k(u-boot),64k(u-boot-env),7936k(fw1),7936k(firmware),128k(res),64k(ART)
when booting from second partition
OpenWrt 19 used to works perfectly with this trick, while with current
development branch it boot perfectly from first partition but fails to
boot from second :-/
AFAIU now mtdparts are passed via DTS so I have been fiddling with
kernel options to avoid the kernel reading from there as of today I do this
# Avoid MTD partition table being read from Device Tree
safe-upgrade need
# to change it depending if we need to boot fw1 or fw2 so it uses
kernel
# command line to pass partition table
kconfig_unset CONFIG_MTD_OF_PARTS
# Disable kernel command line being read from device tree which is
mutually
# exclusive with reading it from boot loader
# CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER
kconfig_unset CONFIG_MIPS_CMDLINE_FROM_DTB
# safe-upgrade need kernel command line to be generated dinamically
by the
# boot loader (U-Boot) depending on which partition (either fw1 or
fw2) it
# need to boot
kconfig_set CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER
and then pass the mtdparts to kernel command line via U-Boot, the result
is that it keeps booting fine from first partition but it cannot find
root partition when booting from second partition, apparently at some
point sub-MTD-partitions get detected when booting from fw1 while they
are not when booting from fw2
booting form first partition
[ 0.334007] spi-nor spi0.0: w25q128 (16384 Kbytes)
[ 0.338951] mtd: Found partition defined in DT for u-boot. Assigning
OF node to support nvmem.
[ 0.338964] mtd: Found partition defined in DT for u-boot-env.
Assigning OF node to support nvmem.
[ 0.347748] mtd: Found partition defined in DT for firmware.
Assigning OF node to support nvmem.
[ 0.356859] mtd: Found partition defined in DT for res. Assigning OF
node to support nvmem.
[ 0.365783] mtd: Found partition defined in DT for ART. Assigning OF
node to support nvmem.
[ 0.374263] 6 cmdlinepart partitions found on MTD device spi0.0
[ 0.388733] Creating 6 MTD partitions on "spi0.0":
[ 0.393595] 0x000000000000-0x000000040000 : "u-boot"
[ 0.402035] 0x000000040000-0x000000050000 : "u-boot-env"
[ 0.408366] 0x000000050000-0x000000810000 : "firmware"
[ 0.416207] 2 uimage-fw partitions found on MTD device firmware
[ 0.422228] Creating 2 MTD partitions on "firmware":
[ 0.427307] 0x000000000000-0x000000240000 : "kernel"
[ 0.433243] 0x000000240000-0x0000007c0000 : "rootfs"
[ 0.440527] mtd: setting mtd4 (rootfs) as root device
[ 0.445792] 1 squashfs-split partitions found on MTD device rootfs
[ 0.452072] 0x000000690000-0x0000007c0000 : "rootfs_data"
[ 0.458570] 0x000000810000-0x000000fd0000 : "fw2"
[ 0.465664] 0x000000fd0000-0x000000ff0000 : "res"
[ 0.471330] 0x000000ff0000-0x000001000000 : "ART"
[ 0.869051] switch0: Atheros AR8337 rev. 2 switch registered on mdio.0
booting from the second
[ 0.333444] spi-nor spi0.0: w25q128 (16384 Kbytes)
[ 0.338391] mtd: Found partition defined in DT for u-boot. Assigning
OF node to support nvmem.
[ 0.338404] mtd: Found partition defined in DT for u-boot-env.
Assigning OF node to support nvmem.
[ 0.347192] mtd: Found partition defined in DT for res. Assigning OF
node to support nvmem.
[ 0.356297] mtd: Found partition defined in DT for ART. Assigning OF
node to support nvmem.
[ 0.364771] 6 cmdlinepart partitions found on MTD device spi0.0
[ 0.379250] Creating 6 MTD partitions on "spi0.0":
[ 0.384128] 0x000000000000-0x000000040000 : "u-boot"
[ 0.392987] 0x000000040000-0x000000050000 : "u-boot-env"
[ 0.400143] 0x000000050000-0x000000810000 : "fw1"
[ 0.407352] 0x000000810000-0x000000fd0000 : "firmware"
[ 0.414387] 0x000000fd0000-0x000000ff0000 : "res"
[ 0.421421] 0x000000ff0000-0x000001000000 : "ART"
[ 0.818598] switch0: Atheros AR8337 rev. 2 switch registered on mdio.0
.....
[ 2.055622] /dev/root: Can't open blockdev
[ 2.059807] VFS: Cannot open root device "(null)" or
unknown-block(0,0): error -6
[ 2.067440] Please append a correct "root=" boot option; here are the
available partitions:
[ 2.075921] 1f00 256 mtdblock0
[ 2.075933] (driver?)
[ 2.082560] 1f01 64 mtdblock1
[ 2.082568] (driver?)
[ 2.089212] 1f02 7936 mtdblock2
[ 2.089222] (driver?)
[ 2.095856] 1f03 7936 mtdblock3
[ 2.095866] (driver?)
[ 2.102490] 1f04 128 mtdblock4
[ 2.102498] (driver?)
[ 2.109135] 1f05 64 mtdblock5
[ 2.109144] (driver?)
[ 2.115779] Kernel panic - not syncing: VFS: Unable to mount root fs
on unknown-block(0,0)
[ 2.124157] Rebooting in 1 seconds..
AFAIU the code inside 400-mtd-mtdsplit-support.patch is working in the
first case but not on the second, any suggestion?
Cheers
G10h4ck
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