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Explanation of initialization of struct bd_info, in the context of Zedboard.

Non-Zedboard content removed for brevity.

typedef struct bd_info {
        unsigned long   bi_memstart;    /* start of DRAM memory */
        phys_size_t     bi_memsize;     /* size  of DRAM memory in bytes */
        unsigned long   bi_flashstart;  /* start of FLASH memory */
        unsigned long   bi_flashsize;   /* size  of FLASH memory */
        unsigned long   bi_flashoffset; /* reserved area for startup monitor */
        unsigned long   bi_sramstart;   /* start of SRAM memory */
        unsigned long   bi_sramsize;    /* size  of SRAM memory */
#ifdef CONFIG_ARM
        unsigned long   bi_arm_freq; /* arm frequency */
        unsigned long   bi_dsp_freq; /* dsp core frequency */
        unsigned long   bi_ddr_freq; /* ddr frequency */
#endif
...
        unsigned long   bi_bootflags;   /* boot / reboot flag (Unused) */
        unsigned long   bi_ip_addr;     /* IP Address */
        unsigned char   bi_enetaddr[6]; /* OLD: see README.enetaddr */
        unsigned short  bi_ethspeed;    /* Ethernet speed in Mbps */
        unsigned long   bi_intfreq;     /* Internal Freq, in MHz */
        unsigned long   bi_busfreq;     /* Bus Freq, in MHz */
...
        ulong           bi_arch_number; /* unique id for this board */
        ulong           bi_boot_params; /* where this board expects params */
#ifdef CONFIG_NR_DRAM_BANKS
        struct {                        /* RAM configuration */
                phys_addr_t start;
                phys_size_t size;
        } bi_dram[CONFIG_NR_DRAM_BANKS];
#endif /* CONFIG_NR_DRAM_BANKS */
} bd_t;