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How can I use EDATA in Philips 89c669 cpu

Hi!
Can anyone give me some help.
My system: mcu-- 89c669 ;No external RAM and external ROM;keil 710;Rtx_full;
I can not define more than 2 tasks.Because system xdata(768byte) is exhaust.How can I use on board edata(1280byte) as stack instead of xdata.
I once set ESMM=1 in the start_mx.a51.But I got some link error(L119).


Great thanks to you.