Asus RC-AC51 vs ASUS RC-AC51U?

Hi,
I just purchased Asus RC-AC51, while I noticed only ASUS RC-AC51U is supported (https://openwrt.org/toh/asus/rt-ac51u)
ASUS RC-AC51U - https://www.asus.com/us/Networking/RTAC51U/specifications/
ASUS RC-AC51 - https://www.asus.com/Networking/RT-AC51/specifications/

Anyone knows please if the firmware is compatible between those two versions please ?
Thank you.

RT-AC51 looks to be a new product. Is there an FCC ID number printed on underside?

Do you mean this ?

Linux version 3.10.108 (heidi_wen@tpcoverityvu01) (gcc version 4.6.3 (Buildroot 2012.11.1) ) #1 Wed Jan 8 11:45:17 CST 2020

 The CPU feqenuce set to 580 MHz
CPU0 revision is: 00019655 (MIPS 24KEc)
Software DMA cache coherency
Determined physical RAM map:
 memory: 04000000 @ 00000000 (usable)
Initrd not found or empty - disabling initrd
Zone ranges:
  Normal   [mem 0x00000000-0x03ffffff]
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x00000000-0x03ffffff]
On node 0 totalpages: 16384
free_area_init_node: node 0, pgdat 803c8670, node_mem_map 81000000
  Normal zone: 128 pages used for memmap
  Normal zone: 0 pages reserved
  Normal zone: 16384 pages, LIFO batch:3
Primary instruction cache 64kB, 4-way, VIPT, linesize 32 bytes.
Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
pcpu-alloc: [0] 0
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
Kernel command line: console=ttyS1,57600n8 root=/dev/mtdblock4 rootfstype=squashfs noinitrd
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Writing ErrCtl register=0006e120
Readback ErrCtl register=0006e120
Memory: 60624k/65536k available (3192k kernel code, 4912k reserved, 682k data, 220k init, 0k highmem)
NR_IRQS:128
console [ttyS1] enabled
Calibrating delay loop... 385.02 BogoMIPS (lpj=770048)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
NET: Registered protocol family 16
RALINK_GPIOMODE = 54550405
RALINK_GPIOMODE = 54540405
***** Xtal 40MHz *****
start PCIe register access
RALINK_RSTCTRL = 2400000
RALINK_CLKCFG1 = fdbfffc0

*************** MT7628 PCIe RC mode *************
PCIE0 enabled
Port 0 N_FTS = 1b105000
init_rt2880pci done
bio: create slab <bio-0> at 0
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [mem 0x20000000-0x2fffffff]
pci_bus 0000:00: root bus resource [io  0x10160000-0x1016ffff]
pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
pci 0000:00:00.0: [14c3:0801] type 01 class 0x060400
pci 0000:00:00.0: reg 10: [mem 0x00000000-0x7fffffff]
pci 0000:00:00.0: reg 14: [mem 0x00000000-0x0000ffff]
pci 0000:00:00.0: supports D1
pci 0000:00:00.0: PME# supported from D0 D1 D3hot
pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
pci 0000:01:00.0: [14c3:7663] type 00 class 0x000280
pci 0000:01:00.0: reg 10: [mem 0x00000000-0x000fffff 64bit pref]
pci 0000:01:00.0: reg 18: [mem 0x00000000-0x00003fff 64bit pref]
pci 0000:01:00.0: reg 20: [mem 0x00000000-0x00000fff 64bit pref]
pci 0000:01:00.0: supports D1 D2
pci 0000:01:00.0: PME# supported from D0 D1 D2 D3hot D3cold
pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 01
pci 0000:00:00.0: BAR 0: can't assign mem (size 0x80000000)
pci 0000:00:00.0: BAR 9: assigned [mem 0x20000000-0x201fffff pref]
pci 0000:00:00.0: BAR 1: assigned [mem 0x20200000-0x2020ffff]
pci 0000:01:00.0: BAR 0: assigned [mem 0x20000000-0x200fffff 64bit pref]
pci 0000:01:00.0: BAR 2: assigned [mem 0x20100000-0x20103fff 64bit pref]
pci 0000:01:00.0: BAR 4: assigned [mem 0x20104000-0x20104fff 64bit pref]
pci 0000:00:00.0: PCI bridge to [bus 01]
pci 0000:00:00.0:   bridge window [mem 0x20000000-0x201fffff pref]
BAR0 at slot 0 = 0

cat /proc/cpuinfo

system type             : MT7628
machine                 : Unknown
processor               : 0
cpu model               : MIPS 24KEc V5.5
BogoMIPS                : 385.02
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 32
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa                     : mips1 mips2 mips32r1 mips32r2
ASEs implemented        : mips16 dsp
shadow register sets    : 1
kscratch registers      : 0
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available

cat /proc/cmdline

console=ttyS1,57600n8 root=/dev/mtdblock4 rootfstype=squashfs noinitrd
admin@RT-AC51-C3E8:/# cat /proc/cpuinfo
system type             : MT7628
machine                 : Unknown
processor               : 0
cpu model               : MIPS 24KEc V5.5
BogoMIPS                : 385.02
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 32
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa                     : mips1 mips2 mips32r1 mips32r2
ASEs implemented        : mips16 dsp
shadow register sets    : 1
kscratch registers      : 0
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available

cat /proc/mtd

dev:    size   erasesize  name
mtd0: 00030000 00010000 "Bootloader"
mtd1: 00010000 00010000 "nvram"
mtd2: 00010000 00010000 "Factory"
mtd3: 00eb0000 00010000 "linux"
mtd4: 00d57180 00010000 "rootfs"
mtd5: 00100000 00010000 "jffs2"
mtd6: 01000000 00010000 "ALL"

ls /sys/class/net

apclii0  eth2     imq1     lo       rai0     vlan2    wdsi1    wdsi3
br0      imq0     imq2     ra0      vlan1    wdsi0    wdsi2

As there is no FCC ID, it is not for USA.

Referring to the Asus links you provided, both routers have different size flash memory. The old 51U is also powered by MT7620A SoC, where as your screen dump suggests the newer 51 is powered by MT7628.

Unlikely image for RT-AC51U will work on RT-AC50 imho.

1 Like

brctl show

bridge name     bridge id               STP enabled     interfaces
br0             8000.244bfe9ec3e8       no              vlan1
                                                        vlan2
                                                        ra0
                                                        rai0

Thank you...that's bad. Only one letter of difference ;-(

Hi @shaarkys, @bill888 , you seem to indicate that RT-AC51 will not work (at all?), but at the same time you are pasting output of commands from such an RT-AC51 as if you had successfully flashed this router. Can you please let the world know here what does and what doesn't work for you on the RT-AC51, and how did you make it work? Thank you!!

  • CP

This was just from the command line via SSH on original fw....