Dear sir/madam, We are using imx6Q sabresd platform for our development with Linux 3.10.17_1.0.0-GA BSP. http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/commit/?h=imx_3.0.35_4.1.0&id=868d21a7fce9dc90808837e06b0d5e71e38b3b1b In above link shows that, the anatop "reg_pu" value is set to 0x1F which is linux-3.0.35 kernel. @@ -81,6 +101,21 @@ void mx6_cpu_regulator_init(void) regulator_set_voltage(cpu_regulator, cpu_op_tbl[0].cpu_voltage, cpu_op_tbl[0].cpu_voltage); + if (enable_ldo_mode == LDO_MODE_BYPASSED) { + /*digital bypass VDDPU/VDDSOC/VDDARM*/ + reg = __raw_readl(ANADIG_REG_CORE); + reg &= ~BM_ANADIG_REG_CORE_REG0_TRG; + reg |= BF_ANADIG_REG_CORE_REG0_TRG(0x1f); + reg &= ~BM_ANADIG_REG_CORE_REG1_TRG; + reg |= BF_ANADIG_REG_CORE_REG1_TRG(0x1f); + reg &= ~BM_ANADIG_REG_CORE_REG2_TRG; + reg |= BF_ANADIG_REG_CORE_REG2_TRG(0x1f); + __raw_writel(reg, ANADIG_REG_CORE); + /* Mask the ANATOP brown out interrupt in the GPC. */ + reg = __raw_readl(gpc_base + 0x14); + reg |= 0x80000000; + __raw_writel(reg, gpc_base + 0x14); + } clk_set_rate(cpu_clk, cpu_op_tbl[0].cpu_rate); But with reference of Linux 3.10.17_1.0.0-GA BSP, During the LDO bypass the "reg_pu" value is not set to 0x1F as mentioned below. Please clarify. file:u-boot-imx/arch/arm/cpu/armv7/mx6/soc.c void set_anatop_bypass(void) { struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR; u32 reg = readl(&anatop->reg_core); /* bypass VDDARM/VDDSOC */ reg = reg | (0x1F << 18) | 0x1F;<-- PMU_REG_CORE's reg_arm & reg_soc values are set to 0x1F writel(reg, &anatop->reg_core); } Thank you, Regards, Ansari