root@OpenWrt:/tmp# sysupgrade -n -v openwrt-wrt350nv2-squashfs-sysupgrade.img 
Switching to ramdisk...
mount: mounting mini_fo:/overlay on /mnt failed: Device or resource busy
mount: mounting /dev/mtdblock2 on /overlay failed: Device or resource busy
Performing system upgrade...
Unlocking image ...
Writing from <stdin> to image ...     
Upgrade completed
Rebooting system...
Terminated
@OpenWrt:/tmp# device wlan0 left promiscuous mode
br-lan: port 5(wlan0) entering disabled state
Restarting system.

         __  __                      _ _
        |  \/  | __ _ _ ____   _____| | |
        | |\/| |/ _` | '__\ \ / / _ \ | |
        | |  | | (_| | |   \ V /  __/ | |
        |_|  |_|\__,_|_|    \_/ \___|_|_|
 _   _     ____              _
| | | |   | __ )  ___   ___ | |_ 
| | | |___|  _ \ / _ \ / _ \| __| 
| |_| |___| |_) | (_) | (_) | |_ 
 \___/    |____/ \___/ \___/ \__|  ** LOADER **
 ** MARVELL BOARD: RD-88F5181L-VOIP-GE LE 

U-Boot 1.1.1 (Dec 12 2006 - 16:12:22) Marvell version: 1.7.3

DRAM CS[0] base 0x00000000   size  32MB 
DRAM Total size  32MB 
Flash: mvFlashInit base 0xff800000 devW 1 busW 1
Flash: flashStructGet manu 0xec id 0xe0 
Flash: flashStructGet flash is supported.
FLASH: initFlashSecs TOP Sector Type 
Flash: flashSecsInit main sector loop 0 - 127 
[8192kB@ff800000] Flash:  8 MB
Addresses 20M - 0M are saved for the U-Boot usage.
Mem malloc Initialization (20M - 16M): Done
*** Warning - bad CRC, using default environment


Soc: MV88F5181 Rev 9
CPU: ARM926 (Rev 0) running @ 500Mhz 
SysClock = 166Mhz , TClock = 166Mhz 


USB 0: host mode
PCI 0: PCI Express Root Complex Interface
PCI 1: Conventional PCI, speed = 33000000
Net:   mvEgigaLoad: egiga0 load ok
egiga0 [PRIME]

***************DRIVER INFO*****************

DRIVER BUILD DATA: Jan  9 2007 at 18:25:44
DRIVER VERSION 1.06

*******************************************
dbSign is:65:52:63:4f:6d:4d
mac address in flash is:00:1d:7e:ad:c9:ae
have eRcOmM 
Hit ENTER to stop autoboot:  0 
copy kernel from 0xff800000 to 0x400000 with size 0x200000
## Booting image at 00400000 ...
   Image Name:   Linux-3.18.21
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1139568 Bytes =  1.1 MB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.