I use all type of loading option for development board lpc2148. I check my Cable and usb CP2102 is working well I check it by command running ON my GSM Modem. I use XP RS232 com 1 port, windows 7 usb type a to usb type b and then CP210x convertor, and on windows 8.1 directly use USB to Serial cp210x convertor. but in all stage error is Auto baud error step-1. and some times it shows cannot read device signature.
Please any one can help me to solve this problem....
Not sure what the GSM modem have with this to do.
But have you selected a quite low baudrate, and also told Flash Magic the actual crystal frequency your processor uses? A number of NXP chips have issues with the auto-baud because of bugs in the boot loader in the chis. Higher baudrates tends to lead to more problems.