Problem with File System in Linux kernel

[Javier Gracia Castro <javier.graciacastro@xxxxxx>]

Hi,

I am very new in embedded design. I have a AT91RM900 EK board and I  
want to add to it a Wi-Fi module with USART interface and implement  
the communication between them. I have downloaded a 1.1.5 u-boot and  
the 2.6.20 kernel successfully compiled. The kernel boots until  
appears the following error:

No filesystem could mount root, tried:  ext2 cramfs
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

I had a ramdisk and I applied to it the mkimage tool and then, I  
downloaded the obtained image. But when I try to boot the kernel and  
the ramdisk with bootm and the two memory addresses, the kernel  
doesn't detect the ramdisk and the same error appears.

I would like to know from where I could download a ramdisk or how to  
build it for my board. I know that there are several types of file  
systems: ext2, cramfs, jssf2, but I don't know how to build them.

Thanks in advance,

Javier


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