Quoth Karthik Balaguru:
> Is it good to boot from RAM or from a Flash that is good for XIP ?

Technically, you're always booting from Flash somewhere along the line :)

Starting the kernel from RAM is easier to get working, so that's probably
the best way to start out using uClinux.  Obviously this method consumes
more RAM.

Using XIP conserves RAM (both because the kernel/filesystem don't need to be
copied to RAM to boot in the first place and because a smaller portion of
each needs to be copied for each instance of a process), so it's a good idea
if you have limited RAM.  It's harder to get working, though, especially
since it requires additional support libraries that the standard toolchain
binaries don't appear to include (so you'll most likely need to custom-build
the toolchain).  It also doesn't seem to mix well with C++ at the moment.



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