dan,

it's all begin with a comment from a friend after
going thru my work.
he said pdata is dangerous, and he showed me
his c51primer.pdf that says:
'as data placement is at the whim of p2!'
well, i am not too worry about that.
of course, i will never write anything to p2 if
xram is in place.
but i see the potential problem, and did some
experiment to work around the situation,
which then come to a confusion to see an xdata
in pdata page.

thanks again.
ab.