OMR0
if (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
writel((status_phys >> 16) >> 16, base + OMR0); /* old fw compatible */
readl(base + OMR0);
while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
writel(0, base + OMR0);
readl(base + OMR0);