The EEPROM contents is built from PDRs (whatever that means). On the N810, the contents of some of the PDRs are loaded via wlan-cal. In EEPROM, the structure is as follows, wlan-cal loads each PDR record contents through different sysfs files.

    __le32 unknown;
    u16    pad;
    __le16 wraplen;
    __le32 arm_opcode;
    u8     data[wraplen];

    u8     pdrdata[variable];

The PDR data is built from records:

    __le16 record_len;     /* in 16-bit words! */
    __le16 record_type;
    u8     record_data[2*record_len];

The last record has bogus data and a record type of zero (PDR_END). The known record types are:

Used on my N810 are the following.

PDR_MANUFACTURING_PART_NUMBER

six times 0x58

PDR_NIC_SERIAL_NUMBER

0x31, 0x30, 0x34, 0x00

PDR_MAC_ADDRESS

6 bytes, hardcoded is bogus data

PDR_INTERFACE_LIST

Built from any count of such structures:

    __le16 role;
    __le16 if_id;
    __le16 variant;
    __le16 btm_compat;
    __le16 top_compat;

PDR_HARDWARE_PLATFORM_COMPONENT_ID

Hardcoded to 0x03, 0x20, 0x00, 0x43

PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED

Starts with the following fields:

    u8     pdr_revision;   /* 1 */
    u8     xcvr_bmp;       /* transceiver bitmap? */

and then any count of such structures:

    __le16 freq;           /* in MHz */
    __le16 rssiA;
    __le16 rssiB;
    __le16 rssiLNA;

PDR_PRISM_PA_CAL_CURVE_DATA

Starts with the following fields:

    u8     pdr_revision;   /* 3 (PHASER) */
    u8     xcvr_bmp;       /* transceiver bitmap? */
    u8     ppc;            /* points per channel */
    u8     pad;

and then any count of such structures:

    __le16 freq;           /* in MHz */
    __le16 ladder;
    u8     rate_set_mask;
    u8     rate_set_size;
    struct {
        __le16 rf_power;
        __le16 pa_detector;
        __le16 pcv;
    } curve_data[ppc];     /* ppc from above */

PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS

Starts with the following fields:

    u8     pdr_revision;   /* 1 (PHASER) */
    u8     xcvr_bmp;       /* transceiver bitmap? */
    u8     pa_lvls;        /* # of PA levels */
    u8     pad;

and then any count of such structures:

    __le16 frequency;      /* in MHz */
    u8     rate_set_mask;
    u8     rate_set_size;
    __le16 limit_barker;
    __le16 limit_bpsk;
    __le16 limit_qpsk;
    __le16 limit_16qam;
    __le16 limit_64qam;

PDR_PRISM_ZIF_TX_IQ_CALIBRATION

Any number of the following structure:

    __le16 frequency;      /* in MHz */
    __le16 param1;
    __le16 param2;
    __le16 param3;
    __le16 param4;

PDR_ANTENNA_GAIN

Hardcoded at 0x08, 0x08, 0x08, 0x08.