msm8909 打开debug串口操作

device/qcom/msm8909/BoardConfig.mk
BOARD_KERNEL_CMDLINE := console=ttyHSL0,115200,n8 androidboot.console=ttyHSL0 androidboot.hardware=qcom user_debug=31 msm_rtb.filter=0x3F ehci-hcd.park=3 androidboot.bootdevice=7824900.sdhci



/kenrel/arch/arm/config
msm8909-1gb-E8909-defconfig
msm8909-1gb-E8909-perf_defconfig

添加：
CONFIG_SERIAL_MSM_HSL=y
CONFIG_SERIAL_MSM_HSL_CONSOLE=y
CONFIG_SERIAL_MSM_SMD=y

/LK/project/msm8909.mk
DEFINES += WITH_DEBUG_UART=1

修改后如果无效，删除out重新编译