PDC_SDRAM_CONTROL
writel(data, mmio + PDC_SDRAM_CONTROL);
readl(mmio + PDC_SDRAM_CONTROL);
writel(data, mmio + PDC_SDRAM_CONTROL);
readl(mmio + PDC_SDRAM_CONTROL);
writel(data, mmio + PDC_SDRAM_CONTROL);
data = readl(mmio + PDC_SDRAM_CONTROL);