2. Function Overview

2.1. Purpose

cv180x/cv181x/cv184x Processorin on Bootloader U-boot-2021.10。 Configurationofnot Processorof( and on )，Need toModify U-boot RelatedProgramCode， (registers), SystemConfiguration (configuration)andDriver(drivers)。

2.2. U-boot Directory Structure

The following table lists commonly modified directories and files.

Directory Name	Description
arch	RISC-VProcessor RelatedProgramCode。
arch/arm/dts or arch/riscv/dts	Linux/uboot DTSConfiguration File。 DTS ActualFile Path( inu-boot folder under)is sdk_source/build/boards/$(CHIP_ARCH)/$(BOARD)/dts_arm (arm)/$(BOARD).dts (for cv184x) ex: cv184x Processor EVB boardNameis cv1842hp_wevb_0014a_spinor sdk_source/build/boards/cv184x/cv1842hp_wevb_0014a_spinor/ dts_arm/$(BOARD).dts
configs	uboot configConfiguration File。 configs ActualFile Pathis sdk_source/build/boards/$(CHIP_ARCH)/$(BOARD)/u-boot/ cvitek_$(BOARD)_defconfig defconfig: uboot orAddconfiguration ex: cv184x Processor EVB boardNameis cv1842hp_wevb_0014a_spinor sdk_source/build/boards/cv184x/cv1842hp_wevb_0014a_spinor/ u-boot/cvitek_cv1842hp_wevb_0014a_spinor_defconfig
Board	SOCProcessor RelatedProgramCode，EVB afterNeed toConfigurationof Settings。 cvitek.h : SettingsGPIO definition and differences between EVBs cvi_board_init.c: EVB I/O, PINMUX ProcessorSettings board.c/cvitek.h ActualFile Pathis sdk_source/build/boards/$(CHIP_ARCH)/$(BOARD)/u-boot/ cvi_board_init.c sdk_source/build/boards/$(CHIP_ARCH)/$(BOARD)/u-boot/ cvitek.h ex: cv184x Processor EVB boardNameis cv1842hp_wevb_0014a_spinor sdk_source/build/boards/cv184x/cv1842hp_wevb_0014a_spinor/ u-boot/cvi_board_init.c sdk_source/build/boards/cv184x/cv1842hp_wevb_0014a_spinor/ u-boot/cvitek.h
Include	Header files
Include/configs	cv184x-asic.h Settingsboot command/configuration.
cmd	Uboot console Command ProgramCode
drivers	Ethernet, usb, storageetc.RelatedDriver