As a previous Nokia 770 and N810 owner, I always boot a clone of Maemo OS through memory card. As a new user of N900, I try to search around the solution how to make Maemo 5 boot from SD. So I can heavily tweak the OS in SD one but not affected the one in rom. The similar solution I found is boot from eMMC. So any other ways to boot from SD?

Hope someone can point me to the right direction.