just FYI, there is an upcoming 2nd edition of chris hallinan's book
"embedded linux primer":
http://www.informit.com/store/product.aspx?isbn=0137061099
disclaimer: i'm one of the pre-pub technical reviewers.
there is also an imminent 3rd edition of the classic "linux kernel
development," by robert love:
http://www.informit.com/store/product.aspx?isbn=0768674271
for which i was the technical editor.
rday