Hi, DaleDe.
I only found one page:
https://wiki.mobileread.com/wiki/N618
It does not seem to be the same device.
In Hanvon website, as well as the wiki, they say it is a Vizplex display, with Windows CE. The Hanvon website also says it is a different processor: an intel celeron.
http://usa.hanvon.com/products/ebook_n618.html
Today, Thalia released the source code for the Linux kernel and U-boot for Oyo, and Frank's at it:
http://www.fwma.de/pmwiki/pmwiki.php?n=OYO.BuildKernel