SD_CLOCK_BURST_SIZE_SETUP
tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);