Newbie here,

I've got a Zoom ADSL X7N that's a combo router and DSL modem.  Zoom's firmware is Linux.  I would like to move to openwrt to get loopback port forwarding going.  I'm not clear if it's possible given the intricacies of booting/running these devices and what looks like a tiny bit of memory.

I've converted a few devices, but they were all well-known, well-documented so those were easy.  This is not one of those devices.

This unit looks vaguely equivalent, but it's not clear what firmware I would try. I'm aware of the likelihood of bricking.  http://wiki.openwrt.org/toh/d-link/dsl-2741b

If I'm missing something that helps, please just let me know and I'll post it.

########Just the facts:

http://www.zoomtel.com/products/5790_specs.html  No links to the GPL firmware bits!

Linux version 2.6.30 (root@linux-Erick) (gcc version 4.4.2 (Buildroot 2010.02-git) ) #1 Fri Jul 6 11:21:56 CST 2012
Telnet drops me into: BCM96328 Broadband Router

cat /proc/meminfo
MemTotal:          60664 kB
MemFree:           30080 kB
Buffers:            3316 kB
Cached:            11480 kB
SwapCached:            0 kB
Active:             6528 kB
Inactive:          11160 kB
Active(anon):       2892 kB
Inactive(anon):        0 kB
Active(file):       3636 kB
Inactive(file):    11160 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:          2912 kB
Mapped:             2728 kB
Slab:               8568 kB
SReclaimable:        556 kB
SUnreclaim:         8012 kB
PageTables:          316 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:       30332 kB
Committed_AS:       6456 kB
VmallocTotal:    1032148 kB
VmallocUsed:        3992 kB

cat /proc/cpuinfo
system type             : 963281TAN
processor               : 0
cpu model               : Broadcom4350 V7.5
BogoMIPS                : 319.48
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 32
extra interrupt vector  : no
hardware watchpoint     : no
ASEs implemented        :
shadow register sets    : 1
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available

meminfo
Total MDM Shared Memory Region : 544KB
Shared Memory Usable           : 000472KB
Shared Memory in-use           : 000072KB
Shared Memory free             : 000400KB
Shared Memory allocs           : 090635
Shared Memory frees            : 089309
Shared Memory alloc/free delta : 001326

Heap bytes in-use     : 000016
Heap allocs           : 000030
Heap frees            : 000029
Heap alloc/free delta : 000001