build or compile rootfs from box A

Dear All

I am a rookie to Linux. I have two units of two-way Linux router Boxes
{Platform: iDirect iDS Platform (XScale)}

BOX "A"  is ok. No problems. While BOX "B" had some errors so I had a
thought to format the flash 

I init the BOX B by using the command

"fis init"

I noticed that these below entries are missing (Linux and RootFS) on BOX B
Redboot>Fis list 
Name             FLASH addr  	Mem addr    	Length      	Entry point
RedBoot          0x50000000  	0x50000000  	0x00040000  	0x00000000
FIS directory    0x50FE0000  	0x50FE0000  	0x0001F000  	0x00000000
RedBoot config   0x50FFF000  	0x50FFF000  	0x00001000  	0x00000000

Missing (Linux and RootFS)
Linux              0x50060000  	0x01600000  	0x00100000  	0x01600000
RootFS           0x50160000  	0x50160000  	0x00E80000  	0x01600000

I got this from BOX A

Redboot>Fis list 
Name             FLASH addr  	Mem addr    	Length      	Entry point
RedBoot          0x50000000  	0x50000000  	0x00040000  	0x00000000
Linux              0x50060000  	0x01600000  	0x00100000  	0x01600000
RootFS           0x50160000  	0x50160000  	0x00E80000  	0x01600000
FIS directory    0x50FE0000  	0x50FE0000  	0x0001F000  	0x00000000
RedBoot config   0x50FFF000  	0x50FFF000  	0x00001000  	0x00000000


>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


I have managed to get back Linux  entry using  a zimage file I got from BOX
A (Working BOX)

I need the RootFS to make my BOX B come alive again



Question?

Can I build/compile RootFS image file from the working BOX A so I can
install into BOX B?


I need Help!!!!! to build or compile rootfs from box A

Thank you



	   
					
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