/** Read one byte from the intel i2c, used for reading SPD on intel chipsets only. */
unsigned char smb_read_byte_intel(uint32_t base, uint8_t adr, uint8_t cmd)
{
    int l1, h1, l2, h2;
    unsigned long long t;
    outb(base + SMBHSTSTS, 0x1f);					// reset SMBus Controller
	outb(base + SMBHSTDAT, 0xff);

	rdtsc(l1, h1);
 	while ( inb(base + SMBHSTSTS) & 0x01)		// wait until read
	{
		rdtsc(l2, h2);
		t = ((h2 - h1) * 0xffffffff + (l2 - l1)) / (Platform.CPU.TSCFrequency / 100);
		if (t > 5)
			return 0xFF;									// break after 5ms
    }

    outb(base + SMBHSTCMD, cmd);
    outb(base + SMBHSTADD, (adr << 1) | 0x01 );
    outb(base + SMBHSTCNT, 0x48 );

    rdtsc(l1, h1);
 	while (!( inb(base + SMBHSTSTS) & 0x02))		// wait til command finished
	{
		rdtsc(l2, h2);
		t = ((h2 - h1) * 0xffffffff + (l2 - l1)) / (Platform.CPU.TSCFrequency / 100);
		if (t > 5)
			return 0xFF;									// break after 5ms
    }
    return inb(base + SMBHSTDAT);
}