SLI4_BMBX_REG
val = readl(sli4->reg[0] + SLI4_BMBX_REG);
writel(val, (sli4->reg[0] + SLI4_BMBX_REG));
writel(val, (sli4->reg[0] + SLI4_BMBX_REG));
&sli4->bmbx.phys, readl(sli4->reg[0] + SLI4_BMBX_REG));
bmbx_val = readl(sli4->reg[0] + SLI4_BMBX_REG);