14/05/2009

OpenWrt et Netgear DG834

[ openwrt dg834 ]

Installation

Un vieux modem/routeur Netgear DG834 trainait sur un coin de mon bureau. Un rapide tour sur http://oldwiki.openwrt.org/OpenWrtDocs(2f)Hardware.html m'apprend que ce matériel est supporté. Je vais donc décrire l'installation de Kamikaze 8.09.

Pas à pas

On commence par activer le telnet depuis l'interface html:

$ wget --user=admin --password=passord 'http://192.168.0.1/setup.cgi?todo=debug'
$ telnet 192.169.0.1

Petit tour du propriétaire:

# cat /proc/version 
Linux version 2.4.17_mvl21-malta-mips_fp_le (root@Run-P4) (gcc version 2.95.3 20010315 (release/MontaVista)) #6 Wed Sep 7 16:50:05 CST 2005

# cat /proc/meminfo 
        total:    used:    free:  shared: buffers:  cached:
Mem:  14757888  6991872  7766016        0   778240  2539520
Swap:        0        0        0
MemTotal:        14412 kB
MemFree:          7584 kB
MemShared:           0 kB
Buffers:           760 kB
Cached:           2480 kB
SwapCached:          0 kB
Active:           1008 kB
Inactive:         3232 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:        14412 kB
LowFree:          7584 kB
SwapTotal:           0 kB
SwapFree:            0 kB

# cat /proc/ticfg/env 
memsize 0x01000000
flashsize       0x00400000
modetty0        115200,n,8,1,hw
modetty1        115200,n,8,1,hw
bootserport     tty0
cpufrequency    150000000
sysfrequency    125000000
bootloaderVersion       0.18.01
ProductID       DG834
HWRevision      Unknown
SerialNumber    none
prompt  DGB34
firstfreeaddress        0x9402e088
req_fullrate_freq       125000000
mtd0    0x900d0000,0x903e0000
mtd1    0x90020000,0x900d0000
mtd2    0x90000000,0x90020000
mtd3    0x903e0000,0x903f0000
autoload
maca    00:09:5b:9e:8e:be
macb    00:09:5b:9e:8e:bf
Bridge_MODE     0
mt_time 0
oam_lb_timeout  100
mtd4    0x903f0000,0x90400000
my_ipaddress    192.168.0.1

# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00310000 00010000 "mtd0"
mtd1: 000b0000 00010000 "mtd1"
mtd2: 00020000 00010000 "mtd2"
mtd3: 00010000 00010000 "mtd3"
mtd4: 00010000 00010000 "mtd4"

La lecture de http://www.earth.li/~noodles/hardware-dg834g.html nous apprend qu'il faut modifier le firmware d'origine. Une version de mtd2.bin avec le bon md5 est disponible ici.

# cd /tmp
# wget http://download.bsdsx.fr/netgear/mtd2.bin
# dd if=/tmp/mtd2.bin of=/dev/mtdblock/2
# reboot

On réactive le telnet et on prépare l'installation d'OpenWrt:

# cd /proc/sys/dev/adam2 
# echo "mtd5 0x90020000,0x903e0000" > environment
# reboot

C'est reparti pour un telnet et on passe aux choses sérieuses:

# wget http://downloads.openwrt.org/kamikaze/8.09/ar7/openwrt-ar7-squashfs.bin
# dd if=openwrt-ar7-squashfs.bin of=/dev/mtdblock/5
# reboot

Et là c'est le drame:

$ ping -c 1 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
From 192.168.0.115 icmp_seq=1 Destination Host Unreachable

--- 192.168.0.1 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms

Console série USB

Pour cette recette, il nous faut:

Petit tip pour la soudure: maintenez simplement la pinoche sur la pastille d'étain à l'aide de la pince et faites chauffer le dessus de la pinoche. Appuyez vers le bas et la pinoche rentre toute seule.

Un petit schéma ascii:

j101

j603 [[o]] [o] [o] [o] [o] [o]
       N    B       B
       o    l       l
       i    a       e
       r    n       u
            c
j100

Je suis une vrai quiche en électronique donc cette manipulation est vraiment à la portée du plus grand nombre.

Lève-toi et marche

$ cu -l /dev/ttyU0 -s 115200
ADAM2 Revision 0.18.01
(C) Copyright 1996-2003 Texas Instruments Inc. All Rights Reserved.
(C) Copyright 2003 Telogy Networks, Inc.
Usage: setmfreq [-d] [-s sys_freq, in MHz] [cpu_freq, in MHz]
Memory optimization Complete!

DGB34 >
Press any key to abort OS load, or wait 3 seconds for OS to boot...

DGB34 > help
   Commands   Description
   --------   -----------
         h/help Displays the commands supported
           info Displays board information
          memop Memory Optimization
       setmfreq configures/dumps the system and cpu frequencies
             dm Dump memory at <address>
          erase Erase Flash except Adam2 Kernel and Env space
       printenv Displays Env. Variables
         setenv Sets Env. variable <var> with a value <val>
       unsetenv Unsets the Env. variable <var>
         fixenv Defragment for Env. space
             go Loads the image starting at address <mtd1>

DGB34 > info
Monitor Revision              0.18.01
Monitor Compilation time      Aug  1 2003, 14:43:32
Endianness                    Little
External Memory rate          Full, 16 bit wide
CPU Frequency                 150 MHz
DGB34 > printenv
memsize               0x01000000
flashsize             0x00400000
modetty0              115200,n,8,1,hw
modetty1              115200,n,8,1,hw
bootserport           tty0
cpufrequency          150000000
sysfrequency          125000000
bootloaderVersion     0.18.01
ProductID             DG834
HWRevision            Unknown
SerialNumber          none
prompt                DGB34
firstfreeaddress      0x9402e088
req_fullrate_freq     125000000
mtd0                  0x900d0000,0x903e0000
mtd1                  0x90020000,0x900d0000
mtd2                  0x90000000,0x90020000
mtd3                  0x903e0000,0x903f0000
autoload
maca                  00:09:5b:9e:8e:be
macb                  00:09:5b:9e:8e:bf
Bridge_MODE           0
mt_time               0
oam_lb_timeout        100
mtd4                  0x903f0000,0x90400000
my_ipaddress          192.168.0.1
mtd5                  0x90020000,0x903e0000
DGB34 > go
checksum error
Linux version 2.6.26.5 (nbd&#64;baustelle) (gcc version 4.1.2) #1 Mon Jan 5 05:57:36 CET 2009
console [early0] enabled
CPU revision is: 00018448 (MIPS 4KEc)
TI AR7 (TNETD7300), ID: 0x0005, Revision: 0x02
Determined physical RAM map:
 memory: 01000000 &#64; 14000000 (usable)
Initrd not found or empty - disabling initrd
Zone PFN ranges:
  Normal      81920 ->    86016
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    0:    81920 ->    86016
Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 4064
Kernel command line: init=/etc/preinit rootfstype=squashfs,jffs2, console=ttyS0,115200n8
Primary instruction cache 16kB, VIPT, 4-way, linesize 16 bytes.
Primary data cache 16kB, 4-way, VIPT, no aliases, linesize 16 bytes
PID hash table entries: 64 (order: 6, 256 bytes)
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory: 12572k/16384k available (1988k kernel code, 3812k reserved, 422k data, 124k init, 0k highmem)
SLUB: Genslabs=6, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Mount-cache hash table entries: 512
net_namespace: 644 bytes
NET: Registered protocol family 16
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 512 (order: 0, 4096 bytes)
TCP bind hash table entries: 512 (order: -1, 2048 bytes)
TCP: Hash tables configured (established 512 bind 512)
TCP reno registered
NET: Registered protocol family 1
squashfs: version 3.0 (2006/03/15) Phillip Lougher
Registering mini_fo version $Id$
JFFS2 version 2.2. (NAND) (SUMMARY) &#169; 2001-2006 Red Hat, Inc.
msgmni has been set to 24
io scheduler noop registered
io scheduler deadline registered (default)
Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
serial8250: ttyS0 at MMIO 0x8610e00 (irq = 15) is a TI-AR7
console handover: boot [early0] -> real [ttyS0]
serial8250: ttyS1 at MMIO 0x8610f00 (irq = 16) is a TI-AR7
Fixed MDIO Bus: probed
cpmac-mii: probed
cpmac: device eth0 (regs: 08612800, irq: 41, phy: , mac: 00:09:5b:9e:8e:bf)
cpmac: device eth1 (regs: 08610000, irq: 27, phy: , mac: 00:09:5b:9e:8e:be)
physmap platform flash device: 00800000 at 10000000
physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
 Amd/Fujitsu Extended Query Table at 0x0040
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
cmdlinepart partition parsing not available
RedBoot partition parsing not available
4 ar7part partitions found on MTD device physmap-flash.0
Creating 4 MTD partitions on "physmap-flash.0":
0x00000000-0x00010000 : "loader"
0x003f0000-0x00400000 : "config"
0x00020000-0x003f0000 : "linux"
0x000f0000-0x003f0000 : "rootfs"
mtd: partition "rootfs" set to be root filesystem
mtd: partition "rootfs_data" created automatically, ofs=220000, len=1D0000
0x00220000-0x003f0000 : "rootfs_data"
ar7_wdt: timer margin 59 seconds (prescale 65535, change 57180, freq 62500000)
Registered led device: ppp
Registered led device: status
Registered led device: adsl
Registered led device: wifi
Registered led device: power
vlynq0: regs 0x08611800, irq 29, mem 0x04000000
vlynq1: regs 0x08611c00, irq 33, mem 0x0c000000
TCP vegas registered
NET: Registered protocol family 17
802.1Q VLAN Support v1.8 Ben Greear <greearb&#64;candelatech.com>
All bugs added by David S. Miller <davem&#64;redhat.com>
VFS: Mounted root (squashfs filesystem) readonly.
Freeing unused kernel memory: 124k freed
Please be patient, while OpenWrt loads ...
Algorithmics/MIPS FPU Emulator v1.5
- preinit -
Press CTRL-C for failsafe
switching to jffs2
mini_fo: using base directory: /
mini_fo: using storage directory: /jffs
- init -

Please press Enter to activate this console.


BusyBox v1.11.2 (2009-01-04 22:13:46 CET) built-in shell (ash)
Enter 'help' for a list of built-in commands.

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 KAMIKAZE (8.09, r14511) ----------------------------
  * 10 oz Vodka       Shake well with ice and strain
  * 10 oz Triple sec  mixture into 10 shot glasses.
  * 10 oz lime juice  Salute!
 ---------------------------------------------------
root&#64;OpenWrt:/# PHY: 0:10 - Link is Down
br-lan: Dropping NETIF_F_UFO since no NETIF_F_HW_CSUM feature.
device eth0 entered promiscuous mode
br-lan: port 1(eth0) entering learning state
br-lan: topology change detected, propagating
br-lan: port 1(eth0) entering forwarding state
PPP generic driver version 2.4.2
ip_tables: (C) 2000-2006 Netfilter Core Team
br-lan: port 1(eth0) entering disabled state
br-lan: port 1(eth0) entering learning state
br-lan: topology change detected, propagating
br-lan: port 1(eth0) entering forwarding state
nf_conntrack version 0.5.0 (1024 buckets, 4096 max)
root&#64;OpenWrt:/# ifconfig
br-lan    Link encap:Ethernet  HWaddr 00:09:5B:9E:8E:BF
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth0      Link encap:Ethernet  HWaddr 00:09:5B:9E:8E:BF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:41

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root&#64;OpenWrt:/#

Bon, je reconnais que j'aurais pu me passer de la partie fer à souder si j'avais pingué 192.168.1.1 au lieu de 192.168.0.1 . Cette ip est fixée en dur lors de la compilation d'OpenWrt.

Bonne nouvelle, j'ai maintenant accès au boot ADAM2. Pas suffisant pour flasher la bête en cas de problème comme on peut le lire sur http://www.seattlewireless.net/ADAM2 et mes tentatives de ftp se soldaient par des échecs. Mais maintenant que j'ai accè;s à la console, il est plus facile de détecter cette petite fenêtre où le bootloader accepte les connexions ftp: il suffit d'attendre le message "Press any key to abort OS load...".

Et maintenant

Et oui, c'est bien beau mais qu'est-ce que j'en fais de ce dg834 ? Mon FAI a un célèbre client prénommé Rodolphe qui a tout compris. Ce qui me chagrine:

Quand on commence à avoir plusieurs machines, c'est le genre de services bien pratique. Et quand le tout est ipv6 compliant, pourquoi s'en priver ?

J'ai donc désactiver le dhcp de ma box et configuré dnsmasq. Pour vous éviter de perdre du temps, un extrait de la conf:

config dhcp lan
        option interface      lan
        option start    100
        option limit    150
        option leasetime      48h
        option dhcp_option '3,192.168.0.254'   # gateway

Le dhcp_option m'a fait un peu tourné en bourrique mais maintenant "it works" !

Et demain

Petit tour du stock:

De quoi monter un cluster OpenWrt !

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