[U-Boot-Users] Booting from serial flash?

[Hoda]

Hi everyone,
I was wondering if anyone can help me on this matter:  does the U-boot support 
loading solely from serial flash or nand flash (i.e. no other flash is 
available)?  If so, which of the boards support that.  I've been digging into 
the U-Boot files and I found support for compact flash but it exists along with 
another flash memory, where as I need a bootloader running with only compact 
flash.
Thanks,
Hoda