[高通SDM450][Android9.0]debug串口转通用串口

文章目录

开发平台基本信息

芯片:SDM450

版本:Android 9.0

kernel:msm-4.9

问题描述

由于硬件起初设计的时候，没有预留通用串口，而usb转串口又不是特别稳定，经常会挂死，虽然可以通过上、下电U口节点去恢复串口功能，但是，效果仍然不如直接使用串口好。刚好，在设备上有一个debug串口，平时是驱动调试功能用的，业务就提出将debug串口转为通用串口使用，解决u转串不稳定的问题。

解决方法

debug口转普通串口补丁

diff --git a/device/qcom/msm8953_64/BoardConfig.mk b/device/qcom/msm8953_64/BoardConfig.mkindex 61d3034..676ea13 100755--- a/device/qcom/msm8953_64/BoardConfig.mk+++ b/device/qcom/msm8953_64/BoardConfig.mk@@ -182,8 +182,10 @@ BOARD_VENDOR_KERNEL_MODULES := \endif-ifeq ($(strip $(TARGET_KERNEL_VERSION)), 4.9)- BOARD_KERNEL_CMDLINE := console=ttyHSL0,115200,n8 androidboot.console=ttyHSL0 androidboot.hardware=qcom msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 androidboot.bootdevice=7824900.sdhci earlycon=msm_serial_dm,0x78af000 firmware_class.path=/vendor/firmware_mnt/image androidboot.usbconfigfs=true loop.max_part=7+ifeq ($(strip $(TARGET_KERNEL_VERSION))_$(D2_NoNeed_DebugSerial), 4.9_true)+ BOARD_KERNEL_CMDLINE := user_debug=31 androidboot.hardware=qcom msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 androidboot.bootdevice=7824900.sdhci earlycon=msm_serial_dm,0x78af000 firmware_class.path=/vendor/firmware_mnt/image androidboot.usbconfigfs=true loop.max_part=7+else ifeq ($(strip $(TARGET_KERNEL_VERSION)), 4.9) + BOARD_KERNEL_CMDLINE := console=ttyHSL0,115200,n8 androidboot.console=ttyHSL0 androidboot.hardware=qcom msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 androidboot.bootdevice=7824900.sdhci earlycon=msm_serial_dm,0x78af000 firmware_class.path=/vendor/firmware_mnt/image androidboot.usbconfigfs=true loop.max_part=7else ifeq ($(strip $(TARGET_KERNEL_VERSION)), 3.18)BOARD_KERNEL_CMDLINE := console=ttyHSL0,115200,n8 androidboot.console=ttyHSL0 androidboot.hardware=qcom msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 androidboot.bootdevice=7824900.sdhci earlycon=msm_hsl_uart,0x78af000 firmware_class.path=/vendor/firmware_mnt/image loop.max_part=7endifdiff --git a/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2-perf_defconfig b/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2-perf_defconfigindex 7e0a3d0..1540b98 100755--- a/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2-perf_defconfig+++ b/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2-perf_defconfig@@ -339,8 +339,8 @@ CONFIG_INPUT_UINPUT=y# CONFIG_LEGACY_PTYS is not set# CONFIG_DEVMEM is not set# CONFIG_DEVKMEM is not set-CONFIG_SERIAL_MSM_HS=y-CONFIG_SERIAL_MSM_SMD=y+#CONFIG_SERIAL_MSM_HS=y+#CONFIG_SERIAL_MSM_SMD=yCONFIG_DIAG_CHAR=yCONFIG_DIAG_USES_SMD=yCONFIG_HW_RANDOM=y@@ -701,9 +701,9 @@ CONFIG_USB_SERIAL_PL2303=yCONFIG_USB_SERIAL_FTDI_SIO=yCONFIG_SERIAL_MSM_HSL=y-CONFIG_SERIAL_MSM_HSL_CONSOLE=y+#CONFIG_SERIAL_MSM_HSL_CONSOLE=yCONFIG_SERIAL_MSM=y-CONFIG_SERIAL_MSM_CONSOLE=y+#CONFIG_SERIAL_MSM_CONSOLE=yCONFIG_SENSORS=yCONFIG_SWITCH=ydiff --git a/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2_defconfig b/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2_defconfigindex 8a468b8..b113cc4 100755--- a/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2_defconfig+++ b/kernel/msm-4.9/arch/arm64/configs/msm8953-telpo-D2_defconfig@@ -347,9 +347,9 @@ CONFIG_INPUT_UINPUT=y# CONFIG_DEVMEM is not set# CONFIG_DEVKMEM is not setCONFIG_SERIAL_MSM=y-CONFIG_SERIAL_MSM_CONSOLE=y+#CONFIG_SERIAL_MSM_CONSOLE=yCONFIG_SERIAL_MSM_HS=y-CONFIG_SERIAL_MSM_SMD=y+#CONFIG_SERIAL_MSM_SMD=yCONFIG_DIAG_CHAR=yCONFIG_DIAG_USES_SMD=yCONFIG_HW_RANDOM=y@@ -767,7 +767,7 @@ CONFIG_USB_SERIAL_PL2303=yCONFIG_USB_SERIAL_FTDI_SIO=yCONFIG_SERIAL_MSM_HSL=y-CONFIG_SERIAL_MSM_HSL_CONSOLE=y+#CONFIG_SERIAL_MSM_HSL_CONSOLE=yCONFIG_SENSORS=yCONFIG_SWITCH=y

注：修改完之后进行调试，用AT指令工具打开串口，发生指令没有接收到返回，原因是波特率设置为115200,改为9600就能正常收到返回数据了。