Lpc2000

I use a phytec board phyCORE LPC2294 and have troubles to access the 
external SRAM. I use the following initialisation for the EMC :

    PINSEL2 = 0x0E614924;
    BCFG1   = 0x20000403;

I may read/write the RAM without problems, but the the same pattern of 
4 Bytes is repeated over the whole address range (0x81000000 - 
0x81FFFFFF). It seems that the address lines A2:A23 are not working 
correct but I don't have any idea why.

Has anybody seen such a behaviour ? 
Any suggestions what I've made wrong ?

Thanks
Klaus