These instructions worked for me.  

Verdex - http://www.gumstix.net/wiki/index.php?title=Boot_from_MMC

Overo - http://www.gumstix.net/Software/view/Software-Overo/Creating-a-bootable-microSD-card/111.html

 

From: Charles Stanley [mailto:cestanley@yahoo.com]
Sent: Wednesday, April 29, 2009 8:30 PM
To: Gumstix
Subject: [Gumstix-users] Building an image for SD card

 

Hi,

  Does anyone know how to build an image that will boot on an SD card? I have built and image that runs from the FLASH but when I placed that image onto the SD card, I get the following panic:
"Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)"

any help will be appreciated,
Charles