CRCs over memory ranges are stored in a table format similar to that shown in Section 9.10.1.3 for the CRCs over sections. However, the table format is different than that of CRC tables.

The following figure shows the storage format for CRCs over memory ranges with example values:

Figure 8-10 CRC Storage Format for Memory Ranges

The table header stores the record count and size, as well as the algorithm type and the CRC result. Each table entry encodes the start address and length of a memory range that was used to compute the CRC.

The following header file excerpt shows the C structures the linker creates to manage the CRC information:

typedef struct memrange_crc_record {
    uint16_t            page_id;       /* page number of data                      */
    uint16_t            padding;       /* pad for next 32-bit value                */
    uint32_t            addr;          /* starting address                         */
    uint32_t            size;          /* size of data in 16-bit addressable units */
} MEMRANGE_CRC_RECORD;

typedef struct memrange_crc_table {
    uint16_t            rec_size;      /* 16-bit addressable units                 */
    uint16_t            num_recs;      /* how many records are in the table        */
    uint16_t            crc_alg_ID;    /* CRC algorithm ID                         */
    uint16_t            padding;       /* pad for next 32-bit value                */
    uint32_t            crc_value;     /* result of crc                            */
    MEMRANGE_CRC_RECORD recs[1];
} MEMRANGE_CRC_TABLE;