thanks

actually it always allocates PDATA first,
then followed by XDATA, but they are always
grouped in sequence.
it makes sense, since the initialization routine
at startup.a51, required us to define the
starting and the len of each memory types
(must be in continuous sequence).

you are right, i can fool the compiler that my
xdata start at 0x2100.
the solution would be fine if we always put pdata
at the first page of ram.
but the book says pdata page can be allocated
anywhere in the 64k xram.

as i mentioned before i think i took the concept
of this pdata incorrectly.
if i tell the the compiler my pdata start base,
and the compiler knows that it's only 256 bytes,
doesn't mean it will allocate the whole page for
pdata type.
just like data and idata, they share one memory
class.

well, it may be easy for an expert to have such
a thought, but for me, i still don't have enough
confidence to be sure that i have done all the
necessary settings correctly.

regards.
ab