operating systems (Linux arm builds)

[vinceASPECT]

hello

can people tell me what this document is really saying?

http://www.google.co.uk/url?sa=t&source=web&cd=18&ved=0CE8QxQEwBzgK&url=http%3A%2F%2Fdocs.google.com%2Fviewer%3Fa%3Dv%26q%3Dcache%3A1_MWC0tw1ukJ%3Awww.realview.com.cn%2Fshoppic%2Fdown%2Fseminar%2F0811%2F%2F17-ARM_PeteLewin_Upgrading_ARM926EJ-S_Software_Systems_to_the_ARM1176JZ-S_TechSymp-ok.pdf%2Btcm%2Barm%2B11%26hl%3Den%26gl%3Duk%26pid%3Dbl%26srcid%3DADGEESjI5qthgWuM-angB3y7orEKUtfI3fDhcvICwxS9FoY330waNJh1KxXcjKRGA1wjkCn-CxVyTgZ7z8qh72UJDkIhZ0BVfM27C39ZyWxH29fjRtNS5GZTmGRM84ym8xgdl2fGFfOk%26sig%3DAHIEtbRPnT7EIi_Mg01LXhhC0jkhj18d4A&ei=m1k-TpeJIcfKtAbP17Em&usg=AFQjCNFtn_zJ73NX8cD4x76kMe3-TSqZ9g

is it saying that changes would be made in the Operating system that is being used. But that these changes are very minimal and subtle. It kind of looks to me like it's not too complex to take an OS for the Arm 9 chip and having running on the Arm 11  chip.  

V.