mirrors
/
memtest86plus
mirror of https://github.com/memtest86plus/memtest86plus
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Add SPD decoding for SDRAM.

This commit is contained in:
debrouxl 2022-05-19 15:07:09 +02:00 committed by Sam Demeulemeester
parent 37edb221d7
commit c1d0c17f23
1 changed files with 101 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

106
system/smbus.c
View File

@ -26,11 +26,12 @@ static int8_t spd_page = -1;
static int8_t last_adr = -1;
static spd_info parse_spd_rdram (uint8_t smb_idx, uint8_t slot_idx);
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);
static spd_info parse_spd_ddr5(uint8_t smb_idx, uint8_t slot_idx);
static spd_info parse_spd_sdram (uint8_t smb_idx, uint8_t slot_idx);
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);
static spd_info parse_spd_ddr5 (uint8_t smb_idx, uint8_t slot_idx);
static void print_spdi(spd_info spdi, uint8_t lidx);
static int find_smb_controller(void);
@ -146,6 +147,9 @@ void print_smbus_startup_info(void) {
case 0x07: // DDR
curspd = parse_spd_ddr(index, spdidx);
break;
case 0x04: // SDRAM
curspd = parse_spd_sdram(index, spdidx);
break;
case 0x01: // RAMBUS - RDRAM
if (get_spd(index, spdidx, 1) == 8) {
curspd = parse_spd_rdram(index, spdidx);
@ -1089,6 +1093,98 @@ static spd_info parse_spd_rdram(uint8_t smb_idx, uint8_t slot_idx)
return spdi;
}
static spd_info parse_spd_sdram(uint8_t smb_idx, uint8_t slot_idx)
{
spd_info spdi;
uint8_t bcd;
spdi.type = "SDRAM";
spdi.slot_num = slot_idx;
spdi.sku_len = 0;
spdi.XMP = 0;
uint8_t spd_byte3 = get_spd(smb_idx, slot_idx, 3) & 0x0F; // Number of Row Addresses (2 x 4 bits, upper part used if asymmetrical banking used)
uint8_t spd_byte4 = get_spd(smb_idx, slot_idx, 4) & 0x0F; // Number of Column Addresses (2 x 4 bits, upper part used if asymmetrical banking used)
uint8_t spd_byte5 = get_spd(smb_idx, slot_idx, 5); // Number of Banks on module (8 bits)
uint8_t spd_byte17 = get_spd(smb_idx, slot_idx, 17); // SDRAM Device Attributes, Number of Banks on the discrete SDRAM Device (8 bits)
// Size in MB
if ( (spd_byte3 != 0)
&& (spd_byte4 != 0)
&& (spd_byte3 + spd_byte4 > 17)
&& (spd_byte3 + spd_byte4 <= 29)
&& (spd_byte5 <= 8)
&& (spd_byte17 <= 8)
) {
spdi.module_size = (1U << (spd_byte3 + spd_byte4 - 17)) * ((uint16_t)spd_byte5 * spd_byte17);
} else {
spdi.module_size = 0;
}
spdi.hasECC = ((get_spd(smb_idx, slot_idx, 11) >> 1) == 1);
// Module speed
float tns, tckns;
uint8_t spd_byte9 = get_spd(smb_idx, slot_idx, 9);
tckns = (spd_byte9 >> 4) + (spd_byte9 & 0xF) * 0.1f;
spdi.freq = (uint16_t)(1000.0f / tckns);
// Module Timings
uint8_t spd_byte18 = get_spd(smb_idx, slot_idx, 18);
for (int shft = 0; shft < 7; shft++) {
if ((spd_byte18 >> shft) & 1) {
spdi.tCL = shft;
break;
}
}
tns = get_spd(smb_idx, slot_idx, 29);
spdi.tRCD = (uint16_t)(tns/tckns);
tns = get_spd(smb_idx, slot_idx, 27);
spdi.tRP = (uint16_t)(tns/tckns);
spdi.tRAS = (uint16_t)(get_spd(smb_idx, slot_idx, 30)/tckns);
spdi.tRC = 0;
// Module manufacturer
uint8_t contcode;
for (contcode = 64; contcode < 72; contcode++) {
if (get_spd(smb_idx, slot_idx, contcode) != 0x7F) {
break;
}
}
spdi.jedec_code = ((uint16_t)(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++;
}
}
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
// --------------------------