CLOCK_BASE
tmc = CLOCK_BASE / brv / port->settings.clock_rate;
port->settings.clock_rate = CLOCK_BASE / brv / tmc;
port->settings.clock_rate = CLOCK_BASE / (256 * 512);
tmc = CLOCK_BASE / brv / port->settings.clock_rate;
port->settings.clock_rate = CLOCK_BASE / brv / tmc;
port->settings.clock_rate = CLOCK_BASE / (256 * 512);
static unsigned int CLOCK_BASE;
CLOCK_BASE = use_crystal_clock ? 24576000 : pci_clock_freq;