[Buildroot] Multiple root filesystems for single kernel/toolchain

[Seamus Connor]

I have a system with a few unique restrictions.  It has low memory, and 
its bulk storage device is not available until some bits have been 
flipped in the hardware.  What I would like to do is:

1) Create a bzImage with a baked in minimal initramfs.

2) Create a larger squashfs that is stored in MMC.

What is the best procedure to create multiple file systems w/ 
buildroot?  Would I just have two separate configs that specify 
different packages?

Thanks,

Seamus