基于FS2410的U-boot头文件fs2410.h源码分析

/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <>
 * Marius Groeger <>
 * Gary Jennejohn <>
 * David Mueller <>
 *
 * Configuation settings for the SAMSUNG SMDK2410 board.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either 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 WARRANTY; without 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 program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef __CONFIG_H  //防止重复定义
#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  */

/* 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 CFG_MALLOC_LEN  (CFG_ENV_SIZE + 128*1024)
#define CFG_GBL_DATA_SIZE 128 /* size in bytes reserved for initial data */

/*
 * Hardware drivers
 CS8900网卡，并定义基地址以及总线长度
 */
#define CONFIG_DRIVER_CS8900 1 /* we have a CS8900 on-board */
#define CS8900_BASE  0x19000300    //具体可以参见我写的文章：http://blog.chinaunix.net/u3/113772/showart_2221704.html
#define CS8900_BUS16  1 /* the Linux driver does accesses as shorts */

/*
 * select serial console configuration
 我们使用串行控制口1
 */
#define CONFIG_SERIAL1          1 /* we use SERIAL 1 on SMDK2410 */

/************************************************************
 * RTC
 ************************************************************/
#define CONFIG_RTC_S3C24X0 1

/* allow to overwrite serial and ethaddr */
//允许重写串口与网卡
#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.
 定义常用的命令，如果我们要想增加或删除U-boot中的命令，改动这里就可以了
 */
#include

#define CONFIG_CMD_CACHE
#define CONFIG_CMD_DATE
#define CONFIG_CMD_ELF
#define CONFIG_CMD_NAND
#define CFG_MAX_NAND_DEVICE 1             //板子上有一块nand flash设备
#define CFG_NAND_BASE     0x4e000000      //nand flash控制器的基址
#define CONFIG_CMD_PING

#if 0
/* USB Support*/
#define CONFIG_CMD_USB
#define CONFIG_CMD_FAT
#define CONFIG_USB_OHCI
#define CONFIG_USB_STORAGE
#define CONFIG_USB_KEYBOARD
#define CONFIG_DOS_PARTITION
#define CFG_DEVICE_DEREGISTER
#define CONFIG_SUPPORT_VFAT
#endif

#define LITTLEENDIAN
#define CONFIG_SETUP_MEMORY_TAGS 1           //向内核传递内存分布信息
#define CONFIG_CMDLINE_TAG 1                 //向内核传递命令行参数

#define CONFIG_BOOTDELAY 3
/*#define CONFIG_BOOTARGS "root=ramfs devfs=mount console=ttySA0,9600" */    //uboot启动参数
/*#define CONFIG_ETHADDR 08:00:3e:26:0a:5b */       //网卡地址
#define CONFIG_NETMASK          255.255.255.0           //网关地址
#define CONFIG_IPADDR  10.0.0.110     //开发板IP
#define CONFIG_SERVERIP  10.0.0.1     //主机IP
/*#define CONFIG_BOOTFILE "elinos-lart" */
/*#define CONFIG_BOOTCOMMAND "tftp; bootm" */

#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 CFG_LONGHELP    /* undef to save memory  */
#define CFG_PROMPT  "fs2410(YW) # " /* Monitor Command Prompt */     //控制台前面的提示符
#define CFG_CBSIZE  256  /* Console I/O Buffer Size */     //控制台IO缓冲大小等等
#define CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */
#define CFG_MAXARGS  16  /* max number of command args */
#define CFG_BARGSIZE  CFG_CBSIZE /* Boot Argument Buffer Size */
S
#define CFG_MEMTEST_START 0x30000000 /* memtest works on */ //内存启动地址，根据线路图，接在CPU的nGCS6上，故地址为0x30000000
#define CFG_MEMTEST_END  0x33F00000 /* 63 MB in DRAM */ //高端的1M留给uboot来存储一些数据   (为什么？不明白)

#undef  CFG_CLKS_IN_HZ  /* everything, incl board info, in Hz */

#define CFG_LOAD_ADDR  0x30008000 /* default load address */      //下载的默认地址（不针对使用DNW工具下载）

/* 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 CFG_HZ   1562500

/* valid baudrates */
#define CFG_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 */ //常规堆栈128K
#ifdef CONFIG_USE_IRQ
#define CONFIG_STACKSIZE_IRQ (4*1024) /* IRQ stack */  //IRQ堆栈占4K
#define CONFIG_STACKSIZE_FIQ (4*1024) /* FIQ stack */  //FIQ堆栈也占4K
#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 */  //这组内存地址即0x30000000开始映射到flash的0地址。

#define CFG_FLASH_BASE  PHYS_FLASH_1  //flash的基地址

/*-----------------------------------------------------------------------
 * FLASH and environment organization
 Nor Flash的环境设置
 */

#if 0
#define CONFIG_AMD_LV400 1 /* uncomment this if you have a LV400 flash */
#endif

#if 0
#define CONFIG_AMD_LV800 1 /* uncomment this if you have a LV800 flash */
#endif

//#define CFG_MAX_FLASH_BANKS 1 /* max number of memory banks */

#ifdef CONFIG_AMD_LV800
#define PHYS_FLASH_SIZE  0x00100000 /* 1MB */
#define CFG_MAX_FLASH_SECT (19) /* max number of sectors on one chip */
#define CFG_ENV_ADDR  (CFG_FLASH_BASE + 0x0F0000) /* addr of environment */
#endif

#ifdef CONFIG_AMD_LV400
#define PHYS_FLASH_SIZE  0x00080000 /* 512KB */
#define CFG_MAX_FLASH_SECT (11) /* max number of sectors on one chip */
#define CFG_ENV_ADDR  (CFG_FLASH_BASE + 0x070000) /* addr of environment */
#endif

/* timeout values are in ticks */
#define CFG_FLASH_ERASE_TOUT (5*CFG_HZ) /* Timeout for Flash Erase */        //5秒超时
#define CFG_FLASH_WRITE_TOUT (5*CFG_HZ) /* Timeout for Flash Write */        //5秒超时

//#define CFG_ENV_IS_IN_FLASH 1
#define CFG_ENV_IS_IN_NAND 1   //定义环境变量保存在Nand Flash中
#define CMD_SAVEENV 1
#define CFG_ENV_OFFSET  0x30000   //环境变更的偏移量
#define CFG_ENV_SIZE  0x10000 /* Total Size of Environment Sector */  //环境变量的大小为64K

#define CONFIG_SST_39VF1601    1    //使用SST_39VF1601的Nor Flash
#define CFG_MAX_FLASH_BANKS  1     
#define PHYS_FLASH_SIZE       0x200000   /* 2MB */  //Nor Flash的大小为2M
#define CFG_MAX_FLASH_SECT    (512)       /* max number of sectors on one chip */ //Nor Flash上共有512个扇区,芯片手册上有说明
#define CFG_ENV_ADDR (CFG_FLASH_BASE + 0x30000)   /* addr of environment */  //环境变量的地址

#endif /* __CONFIG_H */