1. 根目录:
2. arch
3. powerpc
4. boot
5. redboot.h

#ifndef _PPC_REDBOOT_H
#define _PPC_REDBOOT_H

//=========================================================================
// include/asm-ppc/redboot.h
//   Copyright (c) 2002, 2003 Gary Thomas (<gary@mlbassoc.com>
//   Copyright (c) 1997 Dan Malek (dmalek@jlc.net)

//
// Board specific details, as provided by RedBoot
//

/* A Board Information structure that is given to a program when
 * RedBoot starts it up.  Note: not all fields make sense for all
 * architectures and it's up to the platform specific code to fill
 * in the details.
 */
typedef struct bd_info {
    unsigned int   bi_tag;        /* Should be 0x42444944 "BDID" */
    unsigned int   bi_size;       /* Size of this structure */
    unsigned int   bi_revision;   /* revision of this structure */
    unsigned int   bi_bdate;      /* bootstrap date, i.e. 0x19971106 */
    unsigned int   bi_memstart;   /* Memory start address */
    unsigned int   bi_memsize;    /* Memory (end) size in bytes */
    unsigned int   bi_intfreq;    /* Internal Freq, in Hz */
    unsigned int   bi_busfreq;    /* Bus Freq, in Hz */
    unsigned int   bi_cpmfreq;    /* CPM Freq, in Hz */
    unsigned int   bi_brgfreq;    /* BRG Freq, in Hz */
    unsigned int   bi_vco;        /* VCO Out from PLL */
    unsigned int   bi_pci_freq;   /* PCI Freq, in Hz */
    unsigned int   bi_baudrate;   /* Default console baud rate */
    unsigned int   bi_immr;       /* IMMR when called from boot rom */
    unsigned char  bi_enetaddr[6];
    unsigned int   bi_flashbase;  /* Physical address of FLASH memory */
    unsigned int   bi_flashsize;  /* Length of FLASH memory */
    int            bi_flashwidth; /* Width (8,16,32,64) */
    unsigned char *bi_cmdline;    /* Pointer to command line */
    unsigned char  bi_esa[3][6];  /* Ethernet station addresses */
    unsigned int   bi_ramdisk_begin, bi_ramdisk_end;
    struct {                      /* Information about [main] video screen */
        short x_res;              /*   Horizontal resolution in pixels */
        short y_res;              /*   Vertical resolution in pixels */
        short bpp;                /*   Bits/pixel */
        short mode;               /*   Type of pixels (packed, indexed) */
        unsigned long fb;         /*   Pointer to frame buffer (pixel) memory */
    } bi_video;
    void         (*bi_cputc)(char);   /* Write a character to the RedBoot console */
    char         (*bi_cgetc)(void);   /* Read a character from the RedBoot console */
    int          (*bi_ctstc)(void);   /* Test for input on the RedBoot console */
} bd_t;

#define BI_REV 0x0102    /* Version 1.02 */

#define bi_pci_busfreq bi_pci_freq
#define bi_immr_base   bi_immr
#endif