Archipelago » qemu

/* Fill in consecutive SDRAM banks with 'ram_size' bytes of memory.

 *

 * sdram_bank_sizes[] must be 0-terminated.

 *

 * The 4xx SDRAM controller supports a small number of banks, and each bank

 * must be one of a small set of sizes. The number of banks and the supported

 * sizes varies by SoC. */

ram_addr_t ppc4xx_sdram_adjust(ram_addr_t ram_size, int nr_banks,

                               target_phys_addr_t ram_bases[],

                               target_phys_addr_t ram_sizes[],

                               const unsigned int sdram_bank_sizes[])

{

    ram_addr_t ram_end = 0;

    int i;

    int j;

    for (i = 0; i < nr_banks; i++) {

        for (j = 0; sdram_bank_sizes[j] != 0; j++) {

            unsigned int bank_size = sdram_bank_sizes[j];

            if (bank_size <= ram_size) {

                ram_bases[i] = ram_end;

                ram_sizes[i] = bank_size;

                ram_end += bank_size;

                ram_size -= bank_size;

                break;

            }

        }

        if (!ram_size) {

            /* No need to use the remaining banks. */

            break;

        }

    }

    if (ram_size)

        printf("Truncating memory to %d MiB to fit SDRAM controller limits.\n",

               (int)(ram_end >> 20));

    return ram_end;

}