Cannot bootup from NAND flash

Dear all,

I tried to replace the 64MB to 128MB NAND flash (same part in schematic). then updated the supervivi_128M to nor flash.  

Then follow the user guide to upload the supervivi_128M , zImage and root_qtopia-128M.img to NAND flash.  the System can bootup when I chose menu Boot the system.  But, when I switch the S2 to NAND flash bootup.  The system cannot bootup. No debug message on console.  What's wrong? please advise.

Thanks.

xball

work la,  要把64M nand flash更换为大页的，需要同时去掉背面的两个电阻：NR4, NR5，新的原理图中有此描述。