| #define SMBUS_MEM_DEVICE_START 0x50 |
| #define SMBUS_MEM_DEVICE_END 0x53 |
| #define SMBUS_MEM_DEVICE_INC 1 |
| |
| static void spd_set_drb(void) |
| { |
| /* |
| * Effects: Uses serial presence detect to set the |
| * DRB registers which holds the ending memory address assigned |
| * to each DIMM. |
| */ |
| unsigned end_of_memory; |
| unsigned char device; |
| |
| end_of_memory = 0; /* in multiples of 8MiB */ |
| device = SMBUS_MEM_DEVICE_START; |
| while (device <= SMBUS_MEM_DEVICE_END) { |
| unsigned side1_bits, side2_bits; |
| int byte, byte2; |
| |
| side1_bits = side2_bits = -1; |
| |
| /* Compute the end address for the DRB register */ |
| /* Only process dimms < 2GB (2^8 * 8MB) */ |
| if (side1_bits < 8) { |
| end_of_memory += (1 << side1_bits); |
| } |
| device += SMBUS_MEM_DEVICE_INC; |
| } |
| } |