Is there some good method for LPC2468 external SDRAM debugger?

(My English may not be very standard, so thank you for your patience)

Help: Is there some good method for LPC2468 external SDRAM debugger?

Because the program volume is too large, I want to debug the program in an external SDRAM, but after setting it according to the relevant instructions, it is found that the starting address still stops at: 0x0000000,
The SDRAM address is not adjusted: 0xa0000000.

The premise is that it is normal to run inside.

The setting method I refer to is: Keil ARM RVMDK software simulation and debugging S3C2410 program in SDRAM
http://hi.baidu.com/ken831001/blog/item/adb592b1b12d545c092302d5.html

www.kynix.com/.../LPC2468FBD208.html

If any master knows, please enlighten me, thank you very much :)