Problem with rootfs mounting

[stl]

Hello all,
I am porting linux-2.6.37 to a new architecture, and I am facing the
well-known problem:

VFS: Cannot open root device "(null)" or unknown-block(0,0)

When I was working on uClinux, the vmlinux image was concatenated with the
romfs image.
The kernel was aware of the address of the magic number -rom1fs- thanks  the
configuration
CONFIG_MTD_UCLINUX_ADDRESS= . . .  in the .config file.

But, I have not found how I can do thit in Linux..
Where and how the romfs tree is created and included to the kernel image?

This question concerns also all the necessary user applications like "init"
and "sh".


 Any help will be very useful.

Thanks in advance.
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