Ok, here is my DRA function for i82830 raminit.c. Feedback,
suggestions welcome. If there is any easier way to write this please
let me know. I am still a newbie at C, but learning quickly. If the
format looks funky, blaime Horde IMAP.
Thanks - Joe
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static void set_dram_row_attributes(const struct mem_controller *ctrl)
{
int i, dra, col, width, page_size;
for (i = 0; i < DIMM_SOCKETS; i++) {
/* First check if a DIMM is actually present. */
if (smbus_read_byte(ctrl->channel0[i], 2) == 4) {
print_debug("Found DIMM in slot ");
print_debug_hex8(i);
print_debug(", Setting DRA...\r\n");
dra = 0x00;
/* columns */
col = smbus_read_byte(ctrl->channel0[i], 4);
/* data width */
width = smbus_read_byte(ctrl->channel0[i], 6);
/* calculate page size in bits */
page_size = ((1 << col) * width);
/* convert to Kilobytes */
dra = ((page_size / 8) >> 10);
/* 2KB */
if (dra == 0x2) {
dra = 0xF0;
/* 4KB */
} else if (dra == 0x4) {
dra = 0xF1;
/* 8KB */
} else if (dra == 0x8) {
dra = 0xF2;
/* 16KB */
} else if (dra == 0x10) {
dra = 0xF3;
} else {
print_debug("Page Size not supported\r\n");
die("HALT!\r\n");
}
} else {
print_debug("No DIMM found in slot ");
print_debug_hex8(i);
print_debug(", Setting DRA to 0xFF\r\n");
/* If there's no DIMM in the slot, set dra value to
0xFF. */
dra = 0xFF;
}
/* Set the value for DRAM Row Attribute Registers */
pci_write_config8(ctrl->d0, DRA + i, dra);
print_debug("DRA ");
print_debug_hex8(DRA + i);
print_debug(" has been set to ");
print_debug_hex8(dra);
print_debug("\r\n");
}
}
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