Uboot移植TQ2440之NOR驱动之一

最新推荐文章于 2020-09-03 14:07:50 发布

luerlyhs

最新推荐文章于 2020-09-03 14:07:50 发布

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本文记录了作者在TQ2440平台上移植NOR Flash驱动的过程，详细介绍了配置文件my2440.h的修改方法及Flash.c文件的内容，并分享了解决过程中遇到的问题。

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弄了三天的TQ2440 NOR Flash今天尘埃落定.

兼职是简直是煎熬啊.找了很多的问题.最后到一一解决.

移植Flash 驱动关键是驱动函数的理解. 虽然移植成功了.但是还是向我的站长要的驱动函数.

NOR Flash的版本是EON29LV160AB 2M

现在总结一下经验:

1:修改root@localhost olduboot]# cd include/configs/my2440.h

这个配置文件.

这个文件里.我们可以修改如下参数./*
/**************************************************************************/

#ifndef __CONFIG_H
#define __CONFIG_H

/*
* High Level Configuration Options
* (easy to change)
*/
#define CONFIG_ARM920T 1 /* This is an ARM920T Core */
#define CONFIG_S3C2410 1 /* in a SAMSUNG S3C2410 SoC */
#define CONFIG_SMDK2410 1 /* on a SAMSUNG SMDK2410 Board */

#define CONFIG_S3C2440 1 /*on my 2440 TQ board*/
/* input clock of PLL */
#define CONFIG_SYS_CLK_FREQ 12000000/* the SMDK2410 has 12MHz input clock */

#define USE_920T_MMU 1
#undef CONFIG_USE_IRQ /* we don't need IRQ/FIQ stuff */

/*
* Size of malloc() pool
*/
#define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE + 128*1024)
#define CONFIG_SYS_GBL_DATA_SIZE 128 /* size in bytes reserved for initial data */

/*
* Hardware drivers这里是网卡的配置参数
*/
#define CONFIG_DRIVER_CS8900 1 /* we have a CS8900 on-board */
#define CS8900_BASE 0x19000300
#define CS8900_BUS16 1 /* the Linux driver does accesses as shorts */

/*
* select serial console configuration 串口1
*/
#define CONFIG_S3C24X0_SERIAL
#define CONFIG_SERIAL1 1 /* we use SERIAL 1 on SMDK2410 */

/************************************************************
* RTC 时钟配置
************************************************************/
#define CONFIG_RTC_S3C24X0 1

/* allow to overwrite serial and ethaddr */
#define CONFIG_ENV_OVERWRITE

#define CONFIG_BAUDRATE 115200

/*
* BOOTP options
*/
#define CONFIG_BOOTP_BOOTFILESIZE
#define CONFIG_BOOTP_BOOTPATH
#define CONFIG_BOOTP_GATEWAY
#define CONFIG_BOOTP_HOSTNAME

/*
* Command line configuration.
*/
#include <config_cmd_default.h>

#define CONFIG_CMD_CACHE
#define CONFIG_CMD_DATE
#define CONFIG_CMD_ELF

//这里修改网卡的相关参数.也可以在Uboot控制台下修改. 这里修改下.顺手嘛

#define CONFIG_BOOTDELAY 3
/*#define CONFIG_BOOTARGS "root=ramfs devfs=mount console=ttySA0,9600" */
/*#define CONFIG_ETHADDR 08:00:3e:26:0a:5b */
#define CONFIG_NETMASK 255.255.255.0
#define CONFIG_IPADDR 192.168.1.123
#define CONFIG_SERVERIP 192.168.1.1
/*#define CONFIG_BOOTFILE "elinos-lart" */
/*#define CONFIG_BOOTCOMMAND "tftp; bootm" */

//下面是GDB调试用的.不理他

#if defined(CONFIG_CMD_KGDB)
#define CONFIG_KGDB_BAUDRATE 115200/* speed to run kgdb serial port */
/* what's this ? it's not used anywhere */
#define CONFIG_KGDB_SER_INDEX 1 /* which serial port to use */
#endif

/*
* Miscellaneous configurable options
*/
#define CONFIG_SYS_LONGHELP /* undef to save memory */
#define CONFIG_SYS_PROMPT "my2440 # " /* Monitor Command Prompt */

//这里修改的是Uboot控制台显示的那个参数

#define CONFIG_SYS_CBSIZE 256 /* Console I/O Buffer Size */
#define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE+sizeof(CONFIG_SYS_PROMPT)+16) /* Print Buffer Size */
#define CONFIG_SYS_MAXARGS 16 /* max number of command args */
#define CONFIG_SYS_BARGSIZE CONFIG_SYS_CBSIZE /* Boot Argument Buffer Size */

#define CONFIG_SYS_MEMTEST_START 0x30000000 /* memtest works on */
#define CONFIG_SYS_MEMTEST_END 0x33F00000 /* 63 MB in DRAM */

#define CONFIG_SYS_LOAD_ADDR 0x33000000 /* default load address */

//默认的下载地址.在 0x33000000 也就是BANK6 地址范围内

/* the PWM TImer 4 uses a counter of 15625 for 10 ms, so we need */
/* it to wrap 100 times (total 1562500) to get 1 sec. */
#define CONFIG_SYS_HZ 1562500

/* valid baudrates 可用的波特率参数*/
#define CONFIG_SYS_BAUDRATE_TABLE { 9600, 19200, 38400, 57600, 115200 }

/*-----------------------------------------------------------------------
* Stack sizes
*
* The stack sizes are set up in start.S using the settings below
*/
#define CONFIG_STACKSIZE (128*1024) /* regular stack */
#ifdef CONFIG_USE_IRQ
#define CONFIG_STACKSIZE_IRQ (4*1024) /* IRQ stack */
#define CONFIG_STACKSIZE_FIQ (4*1024) /* FIQ stack */
#endif

/*-----------------------------------------------------------------------
* Physical Memory Map
*/
#define CONFIG_NR_DRAM_BANKS 1 /* we have 1 bank of DRAM */
#define PHYS_SDRAM_1 0x30000000 /* SDRAM Bank #1 */
#define PHYS_SDRAM_1_SIZE 0x04000000 /* 64 MB */

#define PHYS_FLASH_1 0x00000000 /* Flash Bank #1 */

#define CONFIG_SYS_FLASH_BASE PHYS_FLASH_1

/*-----------------------------------------------------------------------
* FLASH and environment organization
*这里开始就是要修改的FLASh参数,/
#if 0 //屏蔽不用的NOR Flash
#define CONFIG_AMD_LV400 1 /* uncomment this if you have a LV400 flash */

#define CONFIG_AMD_LV800 1 /* uncomment this if you have a LV800 flash */
#endif

#define CONFIG_SYS_MAX_FLASH_BANKS 1 /* max number of memory banks */
#ifdef CONFIG_AMD_LV800
#define PHYS_FLASH_SIZE 0x00100000 /* 1MB */
#define CONFIG_SYS_MAX_FLASH_SECT (19) /* max number of sectors on one chip */
#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x0F0000) /* addr of environment */
#endif
#ifdef CONFIG_AMD_LV400
#define PHYS_FLASH_SIZE 0x00080000 /* 512KB */
#define CONFIG_SYS_MAX_FLASH_SECT (11) /* max number of sectors on one chip */
#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x070000) /* addr of environment */
#endif
/*使能我们的Flash型号.大小为2M.这个32是这么算的:Flash的操作方式有二种.我选择了扇区的操作方式.在Flash.c中会定义#define MAIN_SECT_SIZE 0x10000/* 64 KB */ 所以我们的2M共有32个main_sect_size

#define CONFIG_EON_29LV160AB 1
#define PHYS_FLASH_SIZE 0x200000 //2M
#define CONFIG_SYS_MAX_FLASH_SECT (32) // 2M除以64K=32

#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_SIZE)

//上面这个是NOR中环境变量的存放地址.

/* timeout values are in ticks */
#define CONFIG_SYS_FLASH_ERASE_TOUT (5*CONFIG_SYS_HZ) /* Timeout for Flash Erase */
#define CONFIG_SYS_FLASH_WRITE_TOUT (5*CONFIG_SYS_HZ) /* Timeout for Flash Write */

#define CONFIG_ENV_IS_IN_FLASH 1
#define CONFIG_ENV_SIZE 0x10000 /* Total Size of Environment Sector */

#endif /* __CONFIG_H */

以上是对头文件的配置.

一下是我的Flash.c 文件 .就是支持Flash的初始化, 读写函数以及检测型号的函数;

之后我用ＮＡＮＤ里面的Ｕｂｏｏｔ下载

[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it

Enter your selection: 7

USB host is connected. Waiting a download.

再用DNW下载.到ＳＤＲＡＭ里面运行．这个要屏蔽初始函数.

* we do sys-critical inits only at reboot,

* not when booting from ram!

#ifndef CONFIG_SKIP_LOWLEVEL_INIT