Really a good material for dev who want on device compiling, i think your post should add to wiki page for how to build up dev environment, so can more users benifit from this.

I followed your instructions, but failed at the start.
Few questions please.
1, qmount not found, where can i found it? does it func the same as mount?
2, the folder /floppy exists, does it matter?
3, while mounting sdk image, I used mount instead of qmount because i can't find qmount, but, failed to mount it, which says invalid parameters.