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Diffstat (limited to 'src/mainboard/asus/kfsn4-dre/spd_notes.txt')
| -rw-r--r-- | src/mainboard/asus/kfsn4-dre/spd_notes.txt | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/mainboard/asus/kfsn4-dre/spd_notes.txt b/src/mainboard/asus/kfsn4-dre/spd_notes.txt new file mode 100644 index 0000000000..ff49c18518 --- /dev/null +++ b/src/mainboard/asus/kfsn4-dre/spd_notes.txt @@ -0,0 +1,50 @@ +==================================================================================================== +SPD mux +==================================================================================================== + +DIMM_A1 SDA signal traced to U6 pin 1 +Destructive testing of failed board (removal of U7 northbridge!) yielded the following information: +U6 S0 <--> U7 W2 +U6 S1 <--> U7 W3 + +Proprietary BIOS enables the SPD during POST with: +S0: LOW +S1: LOW + +then temporarily switches to: +S0: LOW +S1: HIGH + +then switches to runtime mode with: +S0: HIGH +S1: LOW + +After probing with a custom GPIO-flipping tool under Linux the following GPIO mappings were found: +CK804 pin W2 <--> GPIO43 +CK804 pin W3 <--> GPIO44 + +==================================================================================================== +Other hardware +==================================================================================================== + +Power LED (-) is connected to U15 (SuperIO) pin 64 via U4 pins 5,6 and a small MOSFET +ID LED (-) is connected to a ??? via U4 pins 1,2,3,4 and U77 pins 5,6 +It appears that setting U15 (SuperIO) pin 88 LOW will override the ID LED and force it ON + +PCIe slot WAKE# connects to U7 pin E23 (PCIE_WAKE#) + +CPU_WARN1 is driven by (???) via a simple buffer (U13 pin 10) +MEM_WARN1 is driven by U7 pin AD3 (CPUVDD_EN) via a simple buffer (U101 pin 3) + +U7 pin AK3 is disconnected (routed to unpopulated capacitor/resistor) +PU1 pin 37 (VDDPWRGD) drives U7 pin AJ4 (CPU_VLD) +A small MOSFET directly above another small MOSFET directly above the right-hand edge of the PCIe slot drives U7 pin AK5 (HT_VLD) + +When > Barcelona CPU installed on PCB rev 1.04G: +U7 pin AK4 (MEM_VLD): HIGH +PU1 pin 37: LOW +U7 pin AK5: LOW + +HyperTransport 1.2V supply appears to be generated by a linear regulator containing Q191 and downconverting the CK804 1.5V supply +The enable pin appears to be tied to AUX_PANEL pin 1 (+5VSB) via a resistor +Through two MOSFETs the HT supply enable pin is tied to U7 pin AE3 (HTVDD_EN) |