RT-AC88U failed boot on 22.03.4

I recently attempted to upgrade my AC88u router by flashing the latest firmware, openwrt-22.03.4-bcm53xx-generic-asus_rt-ac88u-squashfs but encountered an issue where the router failed to boot up. Interestingly, the previous version, 22.03.2, was functioning normally.

For reference, my router's hardware version is A2 and it runs on an ARMv7 Processor rev 0 (v7l) architecture.

I am seeking assistance in resolving this problem and would appreciate any guidance or advice. Thank you.

1 Like

I attached a TTL debug console and fetched some detailed booting logs for your information.

Digital core power voltage set to 1.05V
Decompressing...done
Digital core power voltage set to 1.05V

SHMOO VER 1.13

PKID07DC06011801080000000000001A103F01000000

S3000020B
00001720


RDLYW0 00000004

RDENW0 00000042

RDQSW0 

    0000000000111111111122222222223333333333444444444455555555556666
    0123456789012345678901234567890123456789012345678901234567890123
 00 -------++++++++++++++++++++++++++++X++++++++++++++++++++++++++--
 01 ------------++++++++++++++++++++++++++X+++++++++++++++++++++++++
 02 --------------+++++++++++++++++++++++++X++++++++++++++++++++++++
 03 -----------++++++++++++++++++++++++++X++++++++++++++++++++++++++
 04 -------++++++++++++++++++++++++++X++++++++++++++++++++++++++----
 05 -------++++++++++++++++++++++++++++X+++++++++++++++++++++++++++-
 06 -------++++++++++++++++++++++++++++X+++++++++++++++++++++++++++-
 07 ---------+++++++++++++++++++++++++++X+++++++++++++++++++++++++++
 08 -----++++++++++++++++++++++++++++X+++++++++++++++++++++++++++---
 09 --------++++++++++++++++++++++++++++X+++++++++++++++++++++++++++
 10 ---------+++++++++++++++++++++++++++X+++++++++++++++++++++++++++
 11 -----+++++++++++++++++++++++++++++X+++++++++++++++++++++++++++--
 12 -+++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-----
 13 -++++++++++++++++++++++++++++X++++++++++++++++++++++++++++------
 14 -++++++++++++++++++++++++++++X++++++++++++++++++++++++++++------
 15 -+++++++++++++++++++++++++++X+++++++++++++++++++++++++++--------


PW0 

    0000000000111111111122222222223333333333444444444455555555556666
    0123456789012345678901234567890123456789012345678901234567890123
 00 -------++++++++++++++++++++++++++++X++++++++++++++++++++++++++--
 01 ------------++++++++++++++++++++++++++X+++++++++++++++++++++++++
 02 --------------+++++++++++++++++++++++++X++++++++++++++++++++++++
 03 -----------++++++++++++++++++++++++++X++++++++++++++++++++++++++
 04 ------+++++++++++++++++++++++++++X++++++++++++++++++++++++++----
 05 -------++++++++++++++++++++++++++++X+++++++++++++++++++++++++++-
 06 -------++++++++++++++++++++++++++++X+++++++++++++++++++++++++++-
 07 ---------+++++++++++++++++++++++++++X+++++++++++++++++++++++++++
 08 -----+++++++++++++++++++++++++++++X+++++++++++++++++++++++++++--
 09 -------++++++++++++++++++++++++++++X++++++++++++++++++++++++++++
 10 --------++++++++++++++++++++++++++++X++++++++++++++++++++++++++-
 11 -----+++++++++++++++++++++++++++++X+++++++++++++++++++++++++++--
 12 -+++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-----
 13 -+++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-----
 14 -++++++++++++++++++++++++++++X++++++++++++++++++++++++++++------
 15 -+++++++++++++++++++++++++++X+++++++++++++++++++++++++++--------


NW0 

    0000000000111111111122222222223333333333444444444455555555556666
    0123456789012345678901234567890123456789012345678901234567890123
 00 ----++++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++
 01 --------++++++++++++++++++++++++++++X+++++++++++++++++++++++++++
 02 ----------+++++++++++++++++++++++++++X++++++++++++++++++++++++++
 03 -------++++++++++++++++++++++++++++X++++++++++++++++++++++++++++
 04 ----++++++++++++++++++++++++++++X++++++++++++++++++++++++++++---
 05 ------+++++++++++++++++++++++++++++X++++++++++++++++++++++++++++
 06 -----+++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++
 07 ------+++++++++++++++++++++++++++++X++++++++++++++++++++++++++++
 08 -----+++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++
 09 ------+++++++++++++++++++++++++++++X++++++++++++++++++++++++++++
 10 -----+++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++
 11 ----++++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++
 12 --+++++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++-
 13 ++++++++++++++++++++++++++++++X+++++++++++++++++++++++++++++----
 14 ++++++++++++++++++++++++++++++X++++++++++++++++++++++++++++++---
 15 --++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-----


WRDQW0 

    0000000000111111111122222222223333333333444444444455555555556666
    0123456789012345678901234567890123456789012345678901234567890123
 00 ++++++++++++++++++++++++++X+++++++++++++++++++++++++----------+-
 01 ++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-----+-
 02 ++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-------
 03 ++++++++++++++++++++++++++++X++++++++++++++++++++++++++++-------
 04 ++++++++++++++++++++++++X++++++++++++++++++++++++------------++-
 05 +++++++++++++++++++++++++++X++++++++++++++++++++++++++--------+-
 06 +++++++++++++++++++++++++X+++++++++++++++++++++++++----------++-
 07 ++++++++++++++++++++++++++X++++++++++++++++++++++++++-----------
 08 ++++++++++++++++++++++++++X++++++++++++++++++++++++++---------+-
 09 +++++++++++++++++++++++++++X+++++++++++++++++++++++++++------++-
 10 +++++++++++++++++++++++++++X++++++++++++++++++++++++++----------
 11 +++++++++++++++++++++++++X+++++++++++++++++++++++++-----------+-
 12 +++++++++++++++++++++++++X++++++++++++++++++++++++------------+-
 13 ++++++++++++++++++++++++X+++++++++++++++++++++++-------------++-
 14 ++++++++++++++++++++++++++X+++++++++++++++++++++++++----------+-
 15 +++++++++++++++++++++++++X++++++++++++++++++++++++--------------


WRDMW0 00000026
WRDMW0 00000025


ADDR

    0000000000111111111122222222223333333333444444444455555555556666
    0123456789012345678901234567890123456789012345678901234567890123
 00 +++++++++++++++++++++++S+++++++X++++++++++++++++++++++++++++++++

Decompressing...done


CFE version 7.14.131.1608 (r589038) based on BBP 1.0.37 for BCM947XX (32bit,SP,)
Build Date: � 10� 13 18:19:30 CST 2015 (ham@xpdev)
Copyright (C) 2000-2008 Broadcom Corporation.

Init Arena
Init Devs.
Boot partition size = 262144(0x40000)
DDR Clock: 800 MHz
Info: DDR frequency set from clkfreq=1400,*800*
et1: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 7.14.131.1608 (r589038)
CPU type 0x0: 1400MHz
Tot mem: 524288 KBytes

CFE mem:    0x00F00000 - 0x017ABEC8 (9092808)
Data:       0x00F5401C - 0x00F549C4 (2472)
BSS:        0x00F549D0 - 0x00FA9EC8 (349432)
Heap:       0x00FA9EC8 - 0x017A9EC8 (8388608)
Stack:      0x017A9EC8 - 0x017ABEC8 (8192)
Text:       0x00F00000 - 0x00F4A1E0 (303584)

rtl8354mb initialized(0)(retry 0) 
rtk port_phyEnableAll ok
rtk port_macForceLink_set ext_Port1 ok
get ok, chk 0x1311:1016(0x1016), 0x1305:c010(b4~b7:0x1)
Device eth0:  hwaddr 1C-B7-2C-75-71-C8, ipaddr 192.168.1.1, mask 255.255.255.0
        gateway not set, nameserver not set
Null Rescue Flag.
boot the image...
go load
Loader:raw Filesys:tftp Dev:eth0 File:: Options:(null)
Loading: TFTP Server.
..tftp retry wait 0
Failed.
Could not load :: Timeout occured
Loader:raw Filesys:raw Dev:nflash0.os File: Options:(null)
Loading: ... 2884806 bytes read
Entry at 0x00008000
Closing network.
Starting program at 0x00008000
C:0x00008120-0x002C84E0->0x00A8F500-0x00D4F8C0

Uncompressing Linux... done, booting the kernel.
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.15.108 (builder@buildhost) (arm-openwrt-linux-muslgnueabi-gcc (OpenWrt GCC 12.2.0 r22658-2c530fcb97) 12.2.0, GNU ld (GNU Binutils) 2.40.0) #0 SMP Thu Apr 27 20:26:58 2023
[    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Asus RT-AC88U
[    0.000000] earlycon: ns16550 at MMIO 0x18000300 (options '115200n8')
[    0.000000] printk: bootconsole [ns16550] enabled
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] Hit pending asynchronous external abort (FSR=0x00001c06) during first unmask, this is most likely caused by a firmware/bootloader bug.
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000]   HighMem  [mem 0x0000000008000000-0x000000009fffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000]   node   0: [mem 0x0000000088000000-0x000000009fffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000009fffffff]
[    0.000000] percpu: Embedded 11 pages/cpu s13068 r8192 d23796 u45056
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 130784
[    0.000000] Kernel command line: earlycon
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 509300K/524288K available (6542K kernel code, 570K rwdata, 1480K rodata, 1024K init, 300K bss, 14988K reserved, 0K cma-reserved, 393216K highmem)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] 	Tracing variant of Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] L2C: DT/platform modifies aux control register: 0x0a130000 -> 0x3a530000
[    0.000000] L2C-310 enabling early BRESP for Cortex-A9
[    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
[    0.000000] L2C-310 ID prefetch enabled, offset 1 lines
[    0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled
[    0.000000] L2C-310 cache controller enabled, 16 ways, 256 kB
[    0.000000] L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x7e530001
[    0.000002] sched_clock: 64 bits at 700MHz, resolution 1ns, wraps every 4398046511103ns
[    0.008110] clocksource: arm_global_timer: mask: 0xffffffffffffffff max_cycles: 0xa17102bcf3, max_idle_ns: 440795224838 ns
[    0.019268] Switching to timer-based delay loop, resolution 1ns
[    0.025443] Calibrating delay loop (skipped), value calculated using timer frequency.. 1400.00 BogoMIPS (lpj=7000000)
[    0.036125] pid_max: default: 32768 minimum: 301
[    0.040890] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.048250] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.056618] CPU: Testing write buffer coherency: ok
[    0.061558] CPU0: Spectre v2: using BPIALL workaround
[    0.066871] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.073182] Setting up static identity map for 0x100000 - 0x10003c
[    0.079559] rcu: Hierarchical SRCU implementation.
[    0.084550] dyndbg: Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build
[    0.092447] smp: Bringing up secondary CPUs ...
[    0.097552] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.097565] CPU1: Spectre v2: using BPIALL workaround
[    0.108467] smp: Brought up 1 node, 2 CPUs
[    0.112590] SMP: Total of 2 processors activated (2800.00 BogoMIPS).
[    0.119014] CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x13)
[    0.127537] CPU: This may indicate a broken bootloader or firmware.
[    0.135910] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.145893] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
[    0.152872] pinctrl core: initialized pinctrl subsystem
[    0.158690] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[    0.165151] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.172552] thermal_sys: Registered thermal governor 'step_wise'
[    0.185042] clocksource: Switched to clocksource arm_global_timer
[    0.197906] NET: Registered PF_INET protocol family
[    0.202921] IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
[    0.210605] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[    0.219096] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[    0.226922] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.234627] TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear)
[    0.241759] TCP: Hash tables configured (established 1024 bind 1024)
[    0.248260] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[    0.254857] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[    0.262095] NET: Registered PF_UNIX/PF_LOCAL protocol family
[    0.267854] PCI: CLS 0 bytes, default 64
[    0.272522] workingset: timestamp_bits=14 max_order=17 bucket_order=3
[    0.281339] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.287296] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.297720] bounce: pool size: 64 pages
[    0.301652] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    0.310736] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.318717] printk: console [ttyS0] disabled
[    0.323109] 18000300.serial: ttyS0 at MMIO 0x18000300 (irq = 26, base_baud = 7812500) is a 16550
[    0.332059] printk: console [ttyS0] enabled
[    0.332059] printk: console [ttyS0] enabled
[    0.340492] printk: bootconsole [ns16550] disabled
[    0.340492] printk: bootconsole [ns16550] disabled
[    0.350726] bcm2835-rng 18004000.rng: hwrng registered
[    0.356525] nand: device found, Manufacturer ID: 0xc8, Chip ID: 0xd1
[    0.362909] nand: ESMT NAND 128MiB 3,3V 8-bit
[    0.367292] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[    0.374896] iproc_nand 18028000.nand-controller: detected 128MiB total, 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-8
[    0.385810] Scanning device for bad blocks
[    0.939974] random: crng init done
[    1.289253] 3 fixed-partitions partitions found on MTD device brcmnand.0
[    1.296183] Creating 3 MTD partitions on "brcmnand.0":
[    1.301342] 0x000000000000-0x000000080000 : "boot"
[    1.306647] 0x000000080000-0x000000200000 : "nvram"
[    1.312134] 0x000000200000-0x000008000000 : "firmware"
[    1.318789] 2 trx partitions found on MTD device firmware
[    1.324215] Creating 2 MTD partitions on "firmware":
[    1.329227] 0x00000000001c-0x000000400000 : "linux"
[    1.334118] mtd: partition "linux" doesn't start on an erase/write block boundary -- force read-only
[    1.343748] 0x000000400000-0x000007e00000 : "ubi"
[    1.351005] bcm_iproc 18029200.spi: using bspi-mspi mode
[    1.358309] iproc-mdio 18003000.mdio: Broadcom iProc MDIO bus registered
[    1.366224] b53-srab-switch 18007000.ethernet-switch: found switch: BCM53012, rev 0
[    1.374089] bgmac_bcma: Broadcom 47xx GBit MAC driver loaded
[    1.380249] bcma-host-soc 18000000.axi: bus0: Found chip with id 53030, rev 0x00 and package 0x00
[    1.389247] bcma-host-soc 18000000.axi: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x2A, class 0x0)
[    1.399834] bcma-host-soc 18000000.axi: bus0: Core 1 found: Chipcommon B (manuf 0x4BF, id 0x50B, rev 0x05, class 0x0)
[    1.410583] bcma-host-soc 18000000.axi: bus0: Core 2 found: DMA (manuf 0x4BF, id 0x502, rev 0x04, class 0x0)
[    1.420577] bcma-host-soc 18000000.axi: bus0: Core 3 found: GBit MAC (manuf 0x4BF, id 0x82D, rev 0x07, class 0x0)
[    1.430978] bcma-host-soc 18000000.axi: bus0: Core 4 found: GBit MAC (manuf 0x4BF, id 0x82D, rev 0x07, class 0x0)
[    1.441380] bcma-host-soc 18000000.axi: bus0: Core 5 found: GBit MAC (manuf 0x4BF, id 0x82D, rev 0x07, class 0x0)
[    1.451778] bcma-host-soc 18000000.axi: bus0: Core 6 found: GBit MAC (manuf 0x4BF, id 0x82D, rev 0x07, class 0x0)
[    1.462135] bcma-host-soc 18000000.axi: bus0: Core 7 found: PCIe Gen 2 (manuf 0x4BF, id 0x501, rev 0x07, class 0x0)
[    1.472685] bcma-host-soc 18000000.axi: bus0: Core 8 found: PCIe Gen 2 (manuf 0x4BF, id 0x501, rev 0x07, class 0x0)
[    1.483231] bcma-host-soc 18000000.axi: bus0: Core 9 found: PCIe Gen 2 (manuf 0x4BF, id 0x501, rev 0x07, class 0x0)
[    1.493808] bcma-host-soc 18000000.axi: bus0: Core 10 found: ARM Cortex A9 core (ihost) (manuf 0x4BF, id 0x510, rev 0x07, class 0x0)
[    1.505850] bcma-host-soc 18000000.axi: bus0: Core 11 found: USB 2.0 (manuf 0x4BF, id 0x504, rev 0x07, class 0x0)
[    1.516230] bcma-host-soc 18000000.axi: bus0: Core 12 found: USB 3.0 (manuf 0x4BF, id 0x505, rev 0x07, class 0x0)
[    1.526629] bcma-host-soc 18000000.axi: bus0: Core 13 found: SDIO3 (manuf 0x4BF, id 0x503, rev 0x01, class 0x0)
[    1.536838] bcma-host-soc 18000000.axi: bus0: Core 14 found: I2S (manuf 0x4BF, id 0x834, rev 0x03, class 0x0)
[    1.546873] bcma-host-soc 18000000.axi: bus0: Core 15 found: ARM Cortex A9 JTAG (manuf 0x4BF, id 0x506, rev 0x01, class 0x0)
[    1.558217] bcma-host-soc 18000000.axi: bus0: Core 16 found: Denali DDR2/DDR3 memory controller (manuf 0x4BF, id 0x507, rev 0x01, class 0x0)
[    1.570955] bcma-host-soc 18000000.axi: bus0: Core 17 found: ROM (manuf 0x4BF, id 0x508, rev 0x08, class 0x0)
[    1.581003] bcma-host-soc 18000000.axi: bus0: Core 18 found: NAND flash controller (manuf 0x4BF, id 0x509, rev 0x01, class 0x0)
[    1.592620] bcma-host-soc 18000000.axi: bus0: Core 19 found: SPI flash controller (manuf 0x4BF, id 0x50A, rev 0x01, class 0x0)
[    1.604062] bcma-host-soc 18000000.axi: bus0: Flash type not supported
[    1.621729] bgmac_bcma bcma0:3: Found PHY addr: 0
[    1.626484] bgmac_bcma bcma0:3: Support for Roboswitch not implemented
[    1.633034] bgmac_bcma bcma0:3: Invalid MAC addr: 00:00:00:00:00:00
[    1.639334] bgmac_bcma bcma0:3: Using random MAC: 3a:31:1c:b6:8c:7d
[    1.646371] b53-srab-switch b53-srab-switch: invalid resource
[    1.652156] b53-srab-switch: probe of b53-srab-switch failed with error -22
[    1.659955] bgmac_bcma bcma0:4: Found PHY addr: 30 (NOREGS)
[    1.665613] bgmac_bcma bcma0:4: Support for Roboswitch not implemented
[    1.673482] bgmac_bcma bcma0:5: Found PHY addr: 0
[    1.678267] bgmac_bcma bcma0:5: Support for Roboswitch not implemented
[    1.684822] bgmac_bcma bcma0:5: Invalid MAC addr: 00:00:00:00:00:00
[    1.691134] bgmac_bcma bcma0:5: Using random MAC: d6:39:5b:cd:31:34
[    1.698747] bgmac_bcma bcma0:6: Unsupported core_unit 3
[    1.704015] bgmac_bcma: probe of bcma0:6 failed with error -524
[    1.710109] pcie_iproc_bcma bcma0:7: host bridge /axi@18000000/pcie@12000 ranges:
[    1.717680] pcie_iproc_bcma bcma0:7:   No bus range found for /axi@18000000/pcie@12000, using [bus 00-ff]
[    1.727306] OF: /axi@18000000/pcie@12000: Missing device_type
[    1.733067] pcie_iproc_bcma bcma0:7: non-prefetchable memory resource required
[    1.855029] pcie_iproc_bcma bcma0:7: link: UP
[    1.859492] pcie_iproc_bcma bcma0:7: PCI host bridge to bus 0000:00
[    1.865799] pci_bus 0000:00: root bus resource [bus 00-ff]
[    1.871303] pci_bus 0000:00: root bus resource [mem 0x08000000-0x0fffffff]
[    1.878229] pci 0000:00:00.0: [14e4:d612] type 01 class 0x060400
[    1.884256] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x4 may corrupt adjacent RW1C bits
[    1.893983] pci 0000:00:00.0: PME# supported from D0 D3hot D3cold
[    1.900865] PCI: bus0: Fast back to back transfers disabled
[    1.906481] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[    1.914627] pci 0000:01:00.0: [14e4:4365] type 00 class 0x028000
[    1.920680] pci_bus 0000:01: 2-byte config write to 0000:01:00.0 offset 0x4 may corrupt adjacent RW1C bits
[    1.930383] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00007fff 64bit]
[    1.937209] pci 0000:01:00.0: reg 0x18: [mem 0x00000000-0x003fffff 64bit]
[    1.944109] pci 0000:01:00.0: supports D1 D2
[    1.949132] PCI: bus1: Fast back to back transfers disabled
[    1.954726] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[    1.961398] pci 0000:00:00.0: BAR 8: assigned [mem 0x08000000-0x085fffff]
[    1.968222] pci 0000:01:00.0: BAR 2: assigned [mem 0x08000000-0x083fffff 64bit]
[    1.975572] pci 0000:01:00.0: BAR 0: assigned [mem 0x08400000-0x08407fff 64bit]
[    1.982905] pci 0000:00:00.0: PCI bridge to [bus 01]
[    1.987885] pci 0000:00:00.0:   bridge window [mem 0x08000000-0x085fffff]
[    1.994729] pci 0000:00:00.0: 4.000 Gb/s available PCIe bandwidth (5.0 GT/s PCIe x1 link)
[    2.003082] pcie_iproc_bcma bcma0:8: host bridge /axi@18000000/pcie@13000 ranges:
[    2.010615] pcie_iproc_bcma bcma0:8:   No bus range found for /axi@18000000/pcie@13000, using [bus 00-ff]
[    2.020236] pcie_iproc_bcma bcma0:8: non-prefetchable memory resource required
[    2.145029] pcie_iproc_bcma bcma0:8: link: UP
[    2.149499] pcie_iproc_bcma bcma0:8: PCI host bridge to bus 0001:00
[    2.155808] pci_bus 0001:00: root bus resource [bus 00-ff]
[    2.161312] pci_bus 0001:00: root bus resource [mem 0x20000000-0x27ffffff]
[    2.168238] pci 0001:00:00.0: [14e4:d612] type 01 class 0x060400
[    2.174265] pci_bus 0001:00: 2-byte config write to 0001:00:00.0 offset 0x4 may corrupt adjacent RW1C bits
[    2.183993] pci 0001:00:00.0: PME# supported from D0 D3hot D3cold
[    2.190860] PCI: bus0: Fast back to back transfers disabled
[    2.196470] pci 0001:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[    2.204612] pci 0001:01:00.0: [14e4:4365] type 00 class 0x028000
[    2.210661] pci_bus 0001:01: 2-byte config write to 0001:01:00.0 offset 0x4 may corrupt adjacent RW1C bits
[    2.220367] pci 0001:01:00.0: reg 0x10: [mem 0x00000000-0x00007fff 64bit]
[    2.227188] pci 0001:01:00.0: reg 0x18: [mem 0x00000000-0x003fffff 64bit]
[    2.234084] pci 0001:01:00.0: supports D1 D2
[    2.239113] PCI: bus1: Fast back to back transfers disabled
[    2.244710] pci_bus 0001:01: busn_res: [bus 01-ff] end is updated to 01
[    2.251378] pci 0001:00:00.0: BAR 8: assigned [mem 0x20000000-0x205fffff]
[    2.258200] pci 0001:01:00.0: BAR 2: assigned [mem 0x20000000-0x203fffff 64bit]
[    2.265547] pci 0001:01:00.0: BAR 0: assigned [mem 0x20400000-0x20407fff 64bit]
[    2.272879] pci 0001:00:00.0: PCI bridge to [bus 01]
[    2.277859] pci 0001:00:00.0:   bridge window [mem 0x20000000-0x205fffff]
[    2.284703] pci 0001:00:00.0: 4.000 Gb/s available PCIe bandwidth (5.0 GT/s PCIe x1 link)
[    2.293049] pcie_iproc_bcma bcma0:9: host bridge /axi@18000000/pcie@14000 ranges:
[    2.300590] pcie_iproc_bcma bcma0:9:   No bus range found for /axi@18000000/pcie@14000, using [bus 00-ff]
[    2.310209] pcie_iproc_bcma bcma0:9: non-prefetchable memory resource required
[    2.435029] pcie_iproc_bcma bcma0:9: PHY or data link is INACTIVE!
[    2.441224] pcie_iproc_bcma bcma0:9: no PCIe EP device detected
[    2.448016] bcm47xx-wdt bcm47xx-wdt.0: BCM47xx Watchdog Timer enabled (30 seconds, Software Timer)
[    2.457094] bcma-host-soc 18000000.axi: bus0: Bus registered
[    2.463740] NET: Registered PF_INET6 protocol family
[    2.469833] Segment Routing with IPv6
[    2.473538] In-situ OAM (IOAM) with IPv6
[    2.477566] NET: Registered PF_PACKET protocol family
[    2.482688] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    2.495955] 8021q: 802.1Q VLAN Support v1.8
[    2.500200] Registering SWP/SWPB emulation handler
[    2.507803] b53-srab-switch 18007000.ethernet-switch: found switch: BCM53012, rev 0
[    2.658471] b53-srab-switch 18007000.ethernet-switch: Using legacy PHYLIB callbacks. Please migrate to PHYLINK!
[    2.669089] b53-srab-switch 18007000.ethernet-switch: Using legacy PHYLIB callbacks. Please migrate to PHYLINK!
[    2.680178] b53-srab-switch 18007000.ethernet-switch lan4 (uninitialized): PHY [dsa-0.0:00] driver [Generic PHY] (irq=POLL)
[    2.692605] b53-srab-switch 18007000.ethernet-switch lan3 (uninitialized): PHY [dsa-0.0:01] driver [Generic PHY] (irq=POLL)
[    2.705104] b53-srab-switch 18007000.ethernet-switch lan2 (uninitialized): PHY [dsa-0.0:02] driver [Generic PHY] (irq=POLL)
[    2.717524] b53-srab-switch 18007000.ethernet-switch lan1 (uninitialized): PHY [dsa-0.0:03] driver [Generic PHY] (irq=POLL)
[    2.729952] b53-srab-switch 18007000.ethernet-switch wan (uninitialized): PHY [dsa-0.0:04] driver [Generic PHY] (irq=POLL)
[    2.742592] DSA: tree 0 setup
[    2.745983] UBI: auto-attach mtd4
[    2.749322] ubi0: attaching mtd4
[    2.769747] ubi0 error: ubi_attach: PEB 0 contains corrupted VID header, and the data does not contain all 0xFF
[    2.779905] ubi0 error: ubi_attach: this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection
[    2.791506] Volume identifier header dump:
[    2.795612] 	magic     6e73655f
[    2.798757] 	version   115
[    2.801463] 	vol_type  108
[    2.804170] 	copy_flag 111
[    2.806883] 	compat    112
[    2.809593] 	vol_id    1698508920
[    2.812909] 	lnum      1717960752
[    2.816231] 	data_size 1953655917
[    2.819551] 	used_ebs  1634743391
[    2.822867] 	data_pad  1381511783
[    2.826188] 	sqnum     4409024466394706017
[    2.830291] 	hdr_crc   00626f6f
[    2.833433] Volume identifier header hexdump:
[    2.837815] hexdump of PEB 0 offset 4096, length 126976
[    3.251077] ubi0: scanning is finished
[    3.254858] ubi0 error: ubi_attach: 1 PEBs are corrupted and preserved
[    3.261426] Corrupted PEBs are: 0
[    3.264795] ubi0 error: ubi_read_volume_table: the layout volume was not found
[    3.272236] ubi0 error: ubi_attach_mtd_dev: failed to attach mtd4, error -22
[    3.279342] UBI error: cannot attach mtd4
[    3.284105] /dev/root: Can't open blockdev
[    3.288248] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[    3.295752] Please append a correct "root=" boot option; here are the available partitions:
[    3.304125] 1f00             512 mtdblock0 
[    3.304131]  (driver?)
[    3.310686] 1f01            1536 mtdblock1 
[    3.310691]  (driver?)
[    3.317243] 1f02          129024 mtdblock2 
[    3.317248]  (driver?)
[    3.323793] 1f03            4095 mtdblock3 
[    3.323797]  (driver?)
[    3.330347] 1f04          124928 mtdblock4 
[    3.330352]  (driver?)
[    3.336905] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    3.345188] CPU0: stopping
[    3.347903] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.108 #0
[    3.354011] Hardware name: BCM5301X
[    3.357509] [<c0108fa0>] (unwind_backtrace) from [<c0105170>] (show_stack+0x10/0x20)
[    3.365284] [<c0105170>] (show_stack) from [<c04331e0>] (dump_stack_lvl+0x40/0x4c)
[    3.372883] [<c04331e0>] (dump_stack_lvl) from [<c0107418>] (do_handle_IPI+0xf8/0x140)
[    3.380820] [<c0107418>] (do_handle_IPI) from [<c0107478>] (ipi_handler+0x18/0x20)
[    3.388409] [<c0107478>] (ipi_handler) from [<c01731f8>] (handle_percpu_devid_irq+0x78/0x140)
[    3.396967] [<c01731f8>] (handle_percpu_devid_irq) from [<c016d03c>] (handle_domain_irq+0x5c/0x80)
[    3.405948] [<c016d03c>] (handle_domain_irq) from [<c044ce3c>] (gic_handle_irq+0x7c/0xa0)
[    3.414148] [<c044ce3c>] (gic_handle_irq) from [<c0100b3c>] (__irq_svc+0x5c/0x78)
[    3.421650] Exception stack(0xc0a01f38 to 0xc0a01f80)
[    3.426709] 1f20:                                                       00011eb6 00000000
[    3.434909] 1f40: 00000001 c010f7a0 c0a00000 c0a04f28 00000000 c0a04f5c c0935a30 c0a8f010
[    3.443107] 1f60: c0a04ec8 00000000 c105a03c c0a01f88 c01027f4 c01027f8 60000013 ffffffff
[    3.451297] [<c0100b3c>] (__irq_svc) from [<c01027f8>] (arch_cpu_idle+0x38/0x40)
[    3.458712] [<c01027f8>] (arch_cpu_idle) from [<c014d8b4>] (do_idle+0xb4/0x140)
[    3.466041] [<c014d8b4>] (do_idle) from [<c014dc38>] (cpu_startup_entry+0x18/0x20)
[    3.473630] [<c014dc38>] (cpu_startup_entry) from [<c0901140>] (start_kernel+0x668/0x67c)
[    3.481839] [<c0901140>] (start_kernel) from [<00000000>] (0x0)
[    3.487779] Rebooting in 1 seconds..
Digital core power voltage set to 1.05V
Decompressing...done
Digital core power voltage set to 1.05V

SHMOO VER 1.13

PKID07DC06011801080000000000001A103F01000000

S3000020B
00001750

Seems like this is an ongoing issue with v22.03.03, .04, and potentially .05:

https://forum.openwrt.org/t/asus-rt-ac88u-hw-a6-broken-in-22-03-3/147882/44

Yep, same issue. That thread seemed to have a workaround, but not sure if this ever got pushed to live - or if we can compile ourselves.

Hi there. My router is hang as well and I don't have any lan access nor reset is working. It appears that I have to crack into a hard reset. Could you please provide some detail:

  • how to setup TTL JTAG connection with windows or MacOS ?
  • how to reflash the router ?

Thank you for your help.

You can refer to this article: https://www.asus.com/support/FAQ/1000814/

This is a recovery flash tutorial for AC68U, but works for AC88U as well