37 lines
829 B
C
37 lines
829 B
C
|
void outl(unsigned int value, unsigned short port)
|
||
|
|
{
|
||
|
|
__builtin_outl(value, port);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define PIIX4_DEVFN 0x90
|
||
|
|
#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 device;
|
||
|
|
|
||
|
|
end_of_memory = 0; /* in multiples of 8MiB */
|
||
|
|
device = SMBUS_MEM_DEVICE_START;
|
||
|
|
while (device <= SMBUS_MEM_DEVICE_END) {
|
||
|
|
unsigned side1_bits;
|
||
|
|
|
||
|
|
side1_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);
|
||
|
|
}
|
||
|
|
outl(end_of_memory, 0x1234);
|
||
|
|
}
|
||
|
|
}
|