Donut to Eclair

[Porting beginner]

Hi,

Is there any detail on what changes/new feature required from kernel and
driver when migrating to eclair from donut ?

Is that mandatory have to some feature/modification in kernel ( i.e fb
driver ) to make eclair works along with kernel which is currently working
for donut. kernel 2.6.27 + donut (already working) , same kernel 2.6.27 +
eclair ? . Just to brint-up to eclair home screen, don't care about other
features which is working on donut i.e audio, video etc.