Applying Patches on Development Boards

1. Apply the HDF patches.

   Apply the HDF patches based on the kernel version in the kernel/linux/build repository. For details, see the method for applying the HDF patch in kernel.mk.

   $(OHOS_BUILD_HOME)/drivers/adapter/khdf/linux/patch_hdf.sh $(OHOS_BUILD_HOME) $(KERNEL_SRC_TMP_PATH) $(HDF_PATCH_FILE)
   

2. Apply the chip driver patches.

   The following uses Hi3516D V300 as an example:

   In the kernel/linux/build repository, place the chip module patches in the corresponding path based on the patch path and naming rules for the chip module in 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 be built.

   In the kernel/linux/build repository, place the chip module config file in the corresponding path based on the file path and naming rules for the chip module in 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 applied after the code environment of kernel/linux/linux-*.* is copied. Before running the OpenHarmony version-level build command, ensure that the source code environment of kernel/linux/linux-*.* is available. After the build is complete, the kernel is generated in the kernel directory in the out directory. Modify the config file based on the kernel generated, and copy the generated .config file to the corresponding path in the config repository. Then, the configuration takes effect.