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*((int *)&Buf[2]) = 0x12345678;

RVMDK v3.00a, Hello World sample for RealView compiler

#pragma pack(1)

unsigned char Buf[40];

int main (void)
{
*((short int *)&Buf[0]) = 0x77ff;
*((int *)&Buf[2]) = 0x12345678;
/* initialize the serial interface */
PINSEL0 = 0x00050000;
U1LCR = 0x83;
U1DLL = 97;
U1LCR = 0x03;

printf ("Hello World\n");
printf("%x %x %x %x \n", Buf[0],Buf[1],Buf[2],Buf[3]);
}

Hello World

78 56 34 12
------------
The same thing is for CARM compiler 2.4, 2.5

What I am wrong ?

0