>     Based on SqueakScript species, to have a truly minimal image
>     with just ProtoObject and Metaclass, the followings are also 
> needed:
.....snip
>          UndefinedObject,  UndefinedObject class
so far so good.
>
>          Bitmap,  Bitmap class
No need
>          FakeSmalltalk,  FakeSmalltalk class
Wha?
>          InstructionStream,  InstructionStream class
Huh?
>          PseudoContext,  PseudoContext class
don't think so
>
>          TranslatedMethod,  TranslatedMethod class
pretty sure not

To make a kernel we really need very little. You need stuff to _be_ 
methods, stuff to _hold_ methods and stuff to _run_ methods. Of course, 
we need some way to add more stuff but that doesn't need to be much;  a 
prim that can retrieve something suitable from somewhere (embedded in 
the flash memory, in a file, off a net connection) or whatever. One 
could load a bytearray that is used as an ImageSegment (in which case 
some support code must be in the kernel) or a String to compile (in 
which case the Compiler - or most of it - must be there). Once you have 
that and VM plugins you can put together anything.

tim
-- 
tim at sumeru.stanford.edu