bootconfig.c

em86xx 完整启动程序,支持网络下载与串通下载

/*****************************************
 Copyright (c) 2001-2004
 Sigma Designs, Inc. All Rights Reserved
 Proprietary and Confidential
 *****************************************/

/* This file is part of the EM86XX boot loader */

/*
 * bootconfig.c
 *
 * first revision by Ho Lee 10/30/2002
 * configuration load & save 11/11/2002
 * ported from Jasper boot loader 05/29/2003
 */

#include "config.h"
#include "uart.h"
#include "util.h"
#include "net_ipv4.h"

#include "bootconfig.h"

//
// configuration structure
//
// configuration is not saved always on the same area. because flash can't be overwritten
// and it needs erasing before writing, it is not good idea to overwrite and burn flash 
// every time. so reserve some flash area for configuration, and write the new configuration
// on the next available space, and mark which configuration is the last on the header
//
// header : (from = BOOTCONFIG_FLASHSTART, size = BOOTCONFIG_HEADSIZE)
//    signature (4 bytes) : BOOTCONFIG_HEADSIGN
//    bytes of bit-stream : bit 0 means 'configuration saved' 
//      make use of the fact that : for the flash memory, only changing bit 1 to 0 is possible
//      0xff : not saved
//      0xfe : 1 saved
//      0xfc : 2 saved
// body : (from = BOOTCONFIG_FLASHSTART + BOOTCONFIG_HEADSIZE, size = BOOTCONFIG_SIZE)
//   bootconfig_t
//

#define BOOTCONFIG_FLASHSTART   0x1ff000
#define BOOTCONFIG_FLASHEND     0x200000
#define BOOTCONFIG_FLASHBUF     0x010000

#define BOOTCONFIG_HEADSIZE     0x100
#define BOOTCONFIG_SIZE         0x100
#define BOOTCONFIG_MAXSAVE      ((BOOTCONFIG_FLASHEND - BOOTCONFIG_FLASHSTART - BOOTCONFIG_HEADSIZE) / BOOTCONFIG_SIZE)
#define BOOTCONFIG_POS(x)       (BOOTCONFIG_FLASHSTART + BOOTCONFIG_HEADSIZE + (x) * BOOTCONFIG_SIZE)

//
// global variable
//

bootconfig_t g_bootconfig = {
    major_version : 1,
    minor_version : 0,
    checksum : BOOTCONFIG_BODYSIGN,
    kernel_cmdline : "",
    macaddr: { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
    protocol : BOOTNET_DHCP,
    ipaddr : INADDR_FROM_4INTS(0,0,0,0),
    netmask : INADDR_FROM_4INTS(255,255,0,0),
    gateway : INADDR_FROM_4INTS(0,0,0,0),
    server : INADDR_FROM_4INTS(192,168,1,227),
    dns : 0x00000000,
    domain : "localdomain.com",
    loader_filename : DEFAULT_LOADER_FILENAME,
    misc_filename : DEFAULT_MISC_FILENAME,
    inst_filename : DEFAULT_INST_FILENAME,
    romfs_filename : DEFAULT_ROMFS_FILENAME,
    kernel_filename : DEFAULT_KERNEL_FILENAME,
    kernelfs_filename : DEFAULT_KERNELFS_FILENAME,
    initrd_filename : DEFAULT_INITRD_FILENAME,
#ifdef CONFIG_ENABLE_2NDBOOT
    scnd_loader_filename : DEFAULT_2NDLOADER_FILENAME,
#endif
#ifdef CONFIG_ENABLE_IRQHANDLER
    irqhandler_filename : DEFAULT_IRQHANDLER_FILENAME,
#endif
#ifdef CONFIG_ENABLE_BITMAPS
    bitmap_filename : DEFAULT_IMAGE_FILENAME,
#endif
#ifdef CONFIG_ENABLE_UCODES
    ucode_filename : DEFAULT_UCODE_FILENAME,
#endif
#ifdef CONFIG_ENABLE_USERPREF
    userpref_filename : DEFAULT_USERPREF_FILENAME,
#endif
#ifdef CONFIG_ENABLE_VSYNCPARAM
    vsyncparam_filename : DEFAULT_VSYNCPARAM_FILENAME,
#endif
#ifdef CONFIG_ENABLE_DVI
    dvi_filename : DEFAULT_DVI_FILENAME,
#endif
};

//
// function prototypes
//
int bootconfig_load(int index);
int bootconfig_save(void);
int bootconfig_lastsaved(int *idx);

//
// Load & Save
//

// index : 
//   0 : last saved
//   > 0 : specified index-th saved configuration
// return 0 on success, otherwise -1
int bootconfig_load(int index)
{
    return -1;
}

// return 0 on success, otherwise -1
int bootconfig_save(void)
{
    return -1;
}

// return the index of configuration last saved in idx parameter
// return 0 on success, otherwise -1
int bootconfig_lastsaved(int *idx)
{
    return -1;
}