[SOLVED] RT-AC1900 w/kongac 31800M - serial port Linux shell

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KeithB
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Joined: 22 Jun 2008
Posts: 489

PostPosted: Mon Jun 24, 2019 3:47    Post subject: [SOLVED] RT-AC1900 w/kongac 31800M - serial port Linux shell Reply with quote
How to load and flash a firmware file from a USB device? This unit has been balky and frustrating, and I'm desperately trying to insure a good, reliable firmware load. Tried TFTPD on boot, tried Asus Restore, neither worked. Sad

Are there commands available from the command line to load a firmware file? Any and all help greatly appreciated. Thanks!

Update: I have been able to use TFTP to upload the firmware.trx file from my laptop to the /tmp directory on the router. Now all I need is how to get it loaded.

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2x Asus RT-AC68U


Last edited by KeithB on Wed Jun 26, 2019 23:38; edited 1 time in total
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KeithB
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Joined: 22 Jun 2008
Posts: 489

PostPosted: Mon Jun 24, 2019 11:06    Post subject: Reply with quote
Thank you, eibgrad. Unfortunately, rescue/restore mode is where this router just won't go. Sad No combination of 30/30/30 reset, reset, WDS, or that other button seem to get it into TFTP rescue mode. That's precisely why I've opened it up and connected a serial console.

I just NVRAM SET WAIT_TIME=5, NVRAM WRITE, and REBOOT and it did NOT wait. This is CFE 1.0.20 from way back in the day, even before AImesh was available. I'm surprised it won't even boot wait. Sad

It appears one of the TFTP wait NVRAM settings is not defined. Sad

Code:


Decompressing...done
Detect CPU turbo button...

CFE version 6.37.14.86 (r456083) based on BBP 1.0.37 for BCM947XX (32bit,SP,)
Build Date: Sun Aug  3 03:15:27 WEST 2014 (root@backbone)
Copyright (C) 2000-2008 Broadcom Corporation.

Init Arena
Init Devs.
Boot partition size = 262144(0x40000)
DDR Clock: 666 MHz
Info: DDR frequency set from clkfreq=800,*666*
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 6.37.14.86 (r456083)
CPU type 0x0: 800MHz
Tot mem: 262144 KBytes

CFE mem:    0x00F00000 - 0x01795680 (9000576)
Data:       0x00F4DCDC - 0x00F4E1A8 (1228)
BSS:        0x00F4E1B8 - 0x00F93680 (283848)
Heap:       0x00F93680 - 0x01793680 (8388608)
Stack:      0x01793680 - 0x01795680 (8192)
Text:       0x00F00000 - 0x00F44390 (279440)

Device eth0:  hwaddr 14-DD-A9-88-B5-70, 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: ... 1636032 bytes read
Entry at 0x00008000
Closing network.
Starting program at 0x00008000
Uncompressing Linux... done, booting the kernel.

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KeithB
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Joined: 22 Jun 2008
Posts: 489

PostPosted: Mon Jun 24, 2019 11:29    Post subject: Reply with quote
Okay, it seems the mtd command is supplied by the rc binary:
Code:

root@DD-WRT:/usr/sbin# cd /sbin
root@DD-WRT:/sbin# ls -la mtd*
lrwxrwxrwx    1 root     root             2 Mar 31  2017 mtd -> rc

root@DD-WRT:/bin# mtd -help
mtd: unrecognized option: h
Usage: mtd [<options> ...] <command> [<arguments> ...] <device>

The device is in the format of mtdX (eg: mtd4) or its label.
mtd recognizes these commands:
        unlock                  unlock the device
        resetbc                 reset bootcounter for WRT1900AC/WRT1200AC/WRT1900ACv2
        erase                   erase all data on device
        write <imagefile>|-     write <imagefile> (use - for stdin) to device
Following options are available:
        -q                      quiet mode (once: no [w] on writing,
                                           twice: no status messages)
        -r                      reboot after successful command
        -f                      force write without trx checks
        -e <device>             erase <device> before executing the command

Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards
         mtd -r write linux.trx linux


and the MTD block devices are:

Code:

brw-r--r--    1 root     root       31,   0 Jan  1 01:00 /dev/mtdblock0
brw-r--r--    1 root     root       31,   1 Jan  1 01:00 /dev/mtdblock1
brw-r--r--    1 root     root       31,   2 Jan  1 01:00 /dev/mtdblock2
brw-r--r--    1 root     root       31,   3 Jan  1 01:00 /dev/mtdblock3
brw-r--r--    1 root     root       31,   4 Jan  1 01:00 /dev/mtdblock4


So now I need to determine which of these mtdblock devices is the Linux kernel and which is the userland/application. Sure would be nice if a CFE wizard would help out with a little guidance. Wink

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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 5932
Location: Netherlands

PostPosted: Mon Jun 24, 2019 13:21    Post subject: Reply with quote
I use the following:
Code:
cat /proc/mtd


When I flash my EA6900 (you might need another file!) via CLI:
Code:
cd /tmp

wget http://www.desipro.de/ddwrt/K3-AC-Arm/dd-wrt.v24-K3_AC_ARM_STD.bin

mtd write dd-wrt.v24-K3_AC_ARM_STD.bin linux

reboot


After reboot reset with the WPS button (press WPS button, power down, while holding WPS button, power up and hold for approx 25 seconds till the lights start flashing).
My EA6900 has a CFE derived from Asus Smile

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Routers:Netgear R7800, Netgear R6400v1, Netgear R6400v2, Linksys EA6900 (XvortexCFE), Linksys E2000 (converted WRT320N), WRT54GS v1.
OpenVPN Policy Based Routing guide: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=321686
Install guide R6400v2:http://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
OpenVPN Server Setup:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=318795
Install guide R7800: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Wireguard server setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1183135
Wireguard client setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324624
Wireguard Advanced setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324787
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
KeithB
DD-WRT User


Joined: 22 Jun 2008
Posts: 489

PostPosted: Mon Jun 24, 2019 17:28    Post subject: Reply with quote
@egc: Thank you for confirming what I thought might be the proper mtd write command. Early this morning, I was actually able to use the DD-WRT GUI from the kongac firmware to load the firmware file I could not load, earlier. I strongly suspect it had to do with the flash partition sizes, so I went back to whichever version of the AsusWRT firmware would re-size the partitions. Once that succeeded, I had to scoot out the house and get to work, but I think I'm finally in the clear. Smile
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2x Asus RT-AC68U
KeithB
DD-WRT User


Joined: 22 Jun 2008
Posts: 489

PostPosted: Wed Jun 26, 2019 23:41    Post subject: Reply with quote
FYI, the Asus mtd5 partition was still present, and still had the gzipped archive of T-Mobile certificates.

dd bs=1024 if=/dev/zero of=/dev/mtdblock5

took care of that quite rapidly. No more issues after that.

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