Applying Patches on Development Boards

1. Apply HDF patches. Apply the HDF patches based on the kernel version. For details, see kernel.mk.

   $(OHOS_BUILD_HOME)/drivers/hdf_core/adapter/khdf/linux/patch_hdf.sh $(OHOS_BUILD_HOME) $(KERNEL_SRC_TMP_PATH) $(KERNEL_PATCH_PATH) $(DEVICE_NAME)
   

2. Apply the chip driver patch. The following uses Hi3516D V300 as an example. Place the chip component patches in the related directory. For details about the patch directory and naming rules, see kernel.mk.

   DEVICE_PATCH_DIR := $(OHOS_BUILD_HOME)/kernel/linux/patches/${KERNEL_VERSION}/$(DEVICE_NAME)_patch
   DEVICE_PATCH_FILE := $(DEVICE_PATCH_DIR)/$(DEVICE_NAME).patch
   

3. Modify the config file to build. Place the chip component config in the related directory. For details about the patch directory and naming rules, see kernel.mk.

   KERNEL_CONFIG_PATH := $(OHOS_BUILD_HOME)/kernel/linux/config/${KERNEL_VERSION}
   DEFCONFIG_FILE := $(DEVICE_NAME)_$(BUILD_TYPE)_defconfig
   

   NOTICE
   In the OpenHarmony project build process, patches are installed after "kernel/linux/linux-*.*" is copied. Before using the version-level build command of OpenHarmony, ensure that the "kernel/linux/linux-*.*" source code is available.

   After the build is complete, the kernel is generated in the kernel directory in the out directory. Modify the config file for the target platform based on the kernel generated, and copy the generated .config file to the corresponding path of the platform in the config repository. Then, the configuration takes effect.