MV_PCI_EXP_ROM_BAR_CTL
u32 tmp = readl(mmio + MV_PCI_EXP_ROM_BAR_CTL);
writel(tmp, mmio + MV_PCI_EXP_ROM_BAR_CTL);
tmp = readl(mmio + MV_PCI_EXP_ROM_BAR_CTL);