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lpc2148 not running 60 mz slow

I am using Realview (evaluation) and have the following program for LPC2148:

#include <LPC214x.h>
#define LED 0x01000000
main() { IO1DIR |= LED; //use P1.24 for(;;){ IO1CLR |= LED ; IO1SET |= LED; }
}

the crystal is 12M and multiple factor is 5, no VPB setup (i also tried VPBDIV=1). It means the system should run with CPU clock=60Mhz
The problem is the LED blinks only with 1 MHz.
I tried simulation but the time shown there still indicate that the LED blinks with frequency around 30Mhz.
This happen not only with the LED but with any code i put. It seems that my system runs with 2Mhz CPU clock. Does any one have the same problem, please help me. Thanks a lot.

we have same problem but we change mam numbers(startup.s) but nothing changed
what are correct value pll and mam or exct.i must see about 30 mhz