Problem with init() (in wiring.c) when my init of the UART (unsolved)

Using Arduino Programming Questions
7

Some functions used in bluevmega.c. I've extracted what you need to see to undertsand the issue.

static int readpkt(unsigned char *buf)
{
    unsigned char len, ix;
    buf[0] = 0;
	for (;;) {
        while (buf[0] != 0xaa)  // SOF
        {
			// GLOW: start to loop here: turning turning turning turning if it's with hwsetup() Working well with init() !!!!!!!!!!!
			buf[0] = readv1rx();
        }
		buf[1] = readv1rx();    // destination
		......

extern volatile unsigned char v1head, v1tail, inhead, intail;
extern unsigned char v1buf[], inbuf[];
// LOW LEVEL ROUTINES FOR ARDUINO
// Read one character from the V1 data stream
static int readv1rx(void)
{
    while (v1head == v1tail)
        sleep_mode();
    return v1buf[v1tail++];
}

I hope it's understandable.

Any idea? Thx.