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Add SPD decoding for DDR memory modules

This commit is contained in:
Sam Demeulemeester 2022-04-06 23:55:38 +02:00
parent 2c33aa3e85
commit 43302bf193
1 changed files with 117 additions and 29 deletions
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96
system/smbus.c
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@ -23,6 +23,7 @@ unsigned short smbusbase;
static int8_t spd_page = -1;
static int8_t last_adr = -1;
static spd_info parse_spd_ddr (uint8_t smb_idx, uint8_t slot_idx);
static spd_info parse_spd_ddr2(uint8_t smb_idx, uint8_t slot_idx);
static spd_info parse_spd_ddr3(uint8_t smb_idx, uint8_t slot_idx);
static spd_info parse_spd_ddr4(uint8_t smb_idx, uint8_t slot_idx);
@ -134,6 +135,9 @@ void print_smbus_startup_info(void) {
case 0x08: // DDR2
curspd = parse_spd_ddr2(index, spdidx);
break;
case 0x07: // DDR
curspd = parse_spd_ddr(index, spdidx);
break;
}
if(curspd.isValid) {
@ -187,7 +191,7 @@ static void print_spdi(spd_info spdi, uint8_t lidx)
// Print Manufacturing date (only if valid)
if(curcol <= 72 && spdi.fab_year > 1 && spdi.fab_year < 32 && spdi.fab_week < 53) {
curcol = printf(LINE_SPD+lidx, curcol, " (W%i'%i)", spdi.fab_week, spdi.fab_year);
curcol = printf(LINE_SPD+lidx, curcol, " (W%02i'%02i)", spdi.fab_week, spdi.fab_year);
}
// Print XMP Status
@ -326,7 +330,7 @@ static spd_info parse_spd_ddr4(uint8_t smb_idx, uint8_t slot_idx)
spdi.slot_num = slot_idx;
spdi.sku_len = 0;
// Compute module size in kB with shifts
// Compute module size in MB with shifts
spdi.module_size = 1 << (
((get_spd(smb_idx, slot_idx, 4) & 0xF) + 5) +
((get_spd(smb_idx, slot_idx, 13) & 0x7) + 3) -
@ -419,7 +423,7 @@ static spd_info parse_spd_ddr3(uint8_t smb_idx, uint8_t slot_idx)
spdi.sku_len = 0;
spdi.XMP = 0;
// Compute module size in KB with shifts
// Compute module size in MB with shifts
spdi.module_size = 1 << (
((get_spd(smb_idx, slot_idx, 4) & 0xF) + 5) +
((get_spd(smb_idx, slot_idx, 8) & 0x7) + 3) -
@ -505,7 +509,7 @@ static spd_info parse_spd_ddr2(uint8_t smb_idx, uint8_t slot_idx)
spdi.sku_len = 0;
spdi.XMP = 0;
// Compute module size in KB
// Compute module size in MB
switch (get_spd(smb_idx, slot_idx, 31)) {
case 1:
spdi.module_size = 1024;
@ -578,6 +582,90 @@ static spd_info parse_spd_ddr2(uint8_t smb_idx, uint8_t slot_idx)
return spdi;
}
static spd_info parse_spd_ddr(uint8_t smb_idx, uint8_t slot_idx)
{
spd_info spdi;
spdi.type = "DDR";
spdi.slot_num = slot_idx;
spdi.sku_len = 0;
spdi.XMP = 0;
// Compute module size in MB
switch (get_spd(smb_idx, slot_idx, 31)) {
case 1:
spdi.module_size = 1024;
break;
case 2:
spdi.module_size = 2048;
break;
case 4:
spdi.module_size = 4096;
break;
case 8:
spdi.module_size = 32;
break;
case 16:
spdi.module_size = 64;
break;
case 32:
spdi.module_size = 128;
break;
case 64:
spdi.module_size = 256;
break;
case 128:
spdi.module_size = 512;
break;
default: // we don't support asymetric banking
spdi.module_size = 0;
break;
}
spdi.module_size *= get_spd(smb_idx, slot_idx, 5);
spdi.hasECC = ((get_spd(smb_idx, slot_idx, 11) >> 1) == 1);
// Module speed
uint8_t spd_byte9 = get_spd(smb_idx, slot_idx, 9);
spdi.freq = (float)(1.0f / (((spd_byte9 >> 4) * 10.0f) + (spd_byte9 & 0xF)) * 10000.0f * 2.0f);
// Module manufacturer
uint8_t contcode;
for (contcode = 64; contcode < 72; contcode++) {
if (get_spd(smb_idx, slot_idx, contcode) != 0x7F) {
break;
}
}
spdi.jedec_code = (contcode - 64) << 8;
spdi.jedec_code |= get_spd(smb_idx, slot_idx, contcode) & 0x7F;
// Module SKU
uint8_t sku_byte;
for (int j = 0; j < 18; j++) {
sku_byte = get_spd(smb_idx, slot_idx, 73 + j);
if (sku_byte <= 0x20 && j > 0 && spdi.sku[j - 1] <= 0x20) {
spdi.sku_len--;
break;
} else {
spdi.sku[j] = sku_byte;
spdi.sku_len++;
}
}
uint8_t bcd = get_spd(smb_idx, slot_idx, 93);
spdi.fab_year = bcd - 6 * (bcd >> 4);
bcd = get_spd(smb_idx, slot_idx, 94);
spdi.fab_week = bcd - 6 * (bcd >> 4);
spdi.isValid = true;
return spdi;
}
// --------------------------
// Smbus Controller Functions
// --------------------------