I just installed fanoush's initfs so I could choose what to boot, and copied the file system to the MMC card as specified in the old wiki (alternative 2)
https://maemo.org/community/wiki/how...428c68c35212e0
For some reason, I found the new wiki entry slightly less helpful. I'll see if I can tidy it up: https://wiki.maemo.org/Booting_from_a_flash_card

It worked first time, so I was pretty pleased!

Anyway, my question is this. Why does it say to use the "ext" file system on the memory card instead of jffs2? Surely jffs2 would be more efficient in space and be better suited to a flash file system?

A big thanks to Fanoush and others who have helped keep the 770 alive.
Paul