abort in _Heap_Initialize on lpc2148(Only 32K RAM)

Tue Oct 30 13:58:48 UTC 2007

Dear!
     I debug 4.7.99.2 on lpc2148.The work_space_start Address is 0x40002020 and the work_space_size is 0x8e80.But lpc2148 RAM size is 0x40000000-0x40007fff.I track to _Heap_Initialize.It enter abort mode.I think it already overstep address range.What should i do!
     How to reduce heap size?
                                                   Thanks&Best Regards!
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