如何在uboot中添加驱动程序

Author：杨正date：2016.9.21

目的

在u-boot中添加驱动程序。

详细举例介绍

在uboot中 *** 作寄存器，实现对gpio及外围设备的控制有两种方法，一种是直接在arch/arm/lib/board.c中添加对寄存器的 *** 作代码，如：

#define muxctrl_reg50x200f0014#define GPIO6_DIR 0x201a0400#define GPIO6_1_DATA0x201a0008 #define GPIO6_1 (1 <<1)#define readl(addr) (*(volatile unsigned int*)(addr))#define writel(val, addr) ((*(volatile unsigned int *) (addr)) = (val)) int clear_irled(void){unsigned int reg_valreg_val = writel(0, muxctrl_reg5)// set gpio modereg_val = readl(GPIO6_DIR) reg_val |= GPIO6_1 writel(reg_val, GPIO6_DIR)reg_val = readl(GPIO6_1_DATA) reg_val &= ~GPIO6_1 writel(reg_val, GPIO6_1_DATA)return 0}void start_armboot (void){init_fnc_t **init_fnc_ptr char *s#ifdef CONFIG_HAS_SLAVEchar *e#endif#if defined(CONFIG_VFD) || defined(CONFIG_LCD)unsigned long addr#endif #ifdef CONFIG_HI3516A // defined in the include/configs/hi3516a.hclear_irled() // clear ir led, add by yangzheng 2016.9.21#endif

来自CODE的代码片

snippet_file_0.txt

另一种方法：

1、在driver/下新建hi_gpio目录，如：

[yangzheng@centos6 hi_gpio]$ ls

hi_gpio.c Makefile

hi_gpio.c内容如下：

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[yangzheng@centos6 hi_gpio]$ cat hi_gpio.c/********************************************************************************** Copyright: (C) 2016 Yang Zheng<Zheng.yang@avatarcontrols.com> * All rights reserved.** Filename: hi_gpio.c*Description: This file* *Version: 1.0.0(09/21/2016~)* Author: Yang Zheng <zheng.yang@avatarcontrols.com>* ChangeLog: 1, Release initial version on "09/21/2016 05:41:41 PM"* ********************************************************************************/#include<common.h>#define readl(addr) (*(volatile unsigned int *) (addr))#define writel(val, addr) (*(volatile unsigned int *) (addr) = (val)) #define muxctrl_reg5 0x200f0014#define GPIO6_DIR 0x201a0400#define GPIO6_1_DATA0x201a0008#define GPIO6_1 1 <<1#define REG_SET 1#define REG_CLR 0 #ifdef DEBUG#define DPRINTF(args...) printf(args)#else#define DPRINTF(args...)#endif int clear_irled(void){unsigned int reg_valreg_val = writel(REG_CLR, muxctrl_reg5)// set gpio modereg_val = readl(GPIO6_DIR) reg_val |= GPIO6_1 writel(reg_val, GPIO6_DIR)writel(REG_CLR, GPIO6_1_DATA) DPRINTF("clear ir led...\n")return 0}

来自CODE的代码片

snippet_file_0.txt

Makefile如下（可以拷贝driver目录下的各模块模板）：

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[yangzheng@centos6 hi_gpio]$ cat Makefile## Copyright 2000-2008# Wolfgang Denk, DENX Software Engineering, wd@denx.de.## See file CREDITS for list of people who contributed to this# project.## This program is free softwareyou can redistribute it and/or# modify it under the terms of the GNU General Public License as# published by the Free Software Foundationeither version 2 of# the License, or (at your option) any later version.## This program is distributed in the hope that it will be useful,# but WITHOUT ANY WARRANTYwithout even the implied warranty of# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the# GNU General Public License for more details.## You should have received a copy of the GNU General Public License# along with this programif not, write to the Free Software# Foundation, Inc., 59 Temple Place, Suite 330, Boston,# MA 02111-1307 USA# include $(TOPDIR)/config.mk LIB := $(obj)libhi_gpio.a COBJS-$(CONFIG_HI3516A_GPIO)+= hi_gpio.o COBJS := $(COBJS-y)SRCS:= $(COBJS:.o=.c)OBJS:= $(addprefix $(obj),$(COBJS)) all:$(LIB) $(LIB): $(obj).depend $(OBJS)$(AR) $(ARFLAGS) $@ $(OBJS) ######################################################################### # defines $(obj).depend targetinclude $(SRCTREE)/rules.mk sinclude $(obj).depend ########################################################################

来自CODE的代码片

snippet_file_0.txt

2、在顶层Makefile添加如下代码：

LIBS += drivers/hi_gpio/libhi_gpio.a

3、在include/configs/hi3516a.h中添加如下代码：

#define CONFIG_HI3516A_GPIO

在include下增加hi_gpio.h文件，内容如下：

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[yangzheng@centos6 u-boot-2010.06]$ cat include/hi_gpio.h/******************************************************************************** * Copyright: (C) 2016 Yang Zheng<Zheng.yang@avatarcontrols.com>* All rights reserved. * * Filename: hi_gpio.h *Description: This head file is control hisi gpio * *Version: 1.0.0(09/21/2016~) * Author: Yang Zheng <zheng.yang@avatarcontrols.com>* ChangeLog: 1, Release initial version on "09/21/2016 06:09:49 PM" * ********************************************************************************/#ifndef __HI_GPIO_H__#define __HI_GPIO_H__ extern int clear_irled(void)#endif

来自CODE的代码片

snippet_file_0.txt

4、在arch/arm/lib/board.c 里面调用即可，如：

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[yangzheng@centos6 u-boot-2010.06]$ vim arch/arm/lib/board.c void start_armboot (void){init_fnc_t **init_fnc_ptr char *s#ifdef CONFIG_HAS_SLAVEchar *e#endif#if defined(CONFIG_VFD) || defined(CONFIG_LCD)unsigned long addr#endif #ifdef CONFIG_HI3516A_GPIO clear_irled() // clear ir led, add by yangzheng 2016.9.21#endif……

来自CODE的代码片

snippet_file_0.txt

重新编译即可，调试uboot的方法：

如果设备有网口，可用tftp服务下载：

sf probe 0

mw.b 82000000 ff 0x80000

tftp 82000000 u-boot.bin

Go 82000000

如果没有网口，可用串口下载：

sf probe 0

mw.b 82000000 ff 0x80000

loady 82000000 u-boot.bin

go 82000000

具体步骤： 1、将老毛桃winpe工具u盘插入电脑u *** 接口，按电源键开机。

屏幕上出现启动画面后按快捷键即可进入主菜单，在此选择“【02】运行老毛桃Win8PE工具箱（装机推荐）”并回车，如图所示： 2、进入老毛桃pe系统后会自动运行老毛桃PE一键装机工具，在工具窗口最上方点击“备份分区”选项，如图所示： 3、接着点击“浏览”按钮，在除系统盘以外的分区中选择备份文件保存的位置，然后输入文件名和保存类型，如图所示： 4、返回到工具主窗口，选中系统盘，然后点击“确定”按钮，如图所示： 5、紧接着会d出一个备份提示框，点击高级按钮，字样变成简洁的同时，可以设置备份压缩率、分卷大小等参数，也可以默认设置直接确定开始，如图所示： 6、接下来只需等待系统备份完成，然后进入到系统备份文件所在路径验证是否备份成功，如图所示： 7、最后将备份好的GHOST系统备份文件拷贝到U盘中即可。

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