Difference between revisions of "Board:asrock/939a785gmh"

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(SATA: is OK we init PHY with correct settings)
m (add led note)
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GPO35 - loadline control (0 enabled)
GPO35 - loadline control (0 enabled)
GPO44 | GPO45  | GPO46 - DDR memory voltage  
GPO44 | GPO45  | GPO46 - DDR memory voltage
Suspend LED is the power LED - register 0f3 in SIO. Low = on
== Status ==
== Status ==

Revision as of 20:27, 30 November 2010

Official site

Hardware details

Clock Chip

The clock chip is ICS 9LPRS485CGLF - Could be used for overclocking.

Sideport memory

It uses Elixir n2tu1g16dg-ac, DDR2 800 Mhz.


It uses Winbond W83627DHG. Its GPIOs are connected this way:

GP20 - sideport voltage 1 = 1.82V 0 = 1.92V

GPO40 | GPO41 | GPIO23 GPU voltage - 000 - 1.45V step 0.05 -- 111 - 1.10V

GPO35 - loadline control (0 enabled)

GPO44 | GPO45 | GPO46 - DDR memory voltage

Suspend LED is the power LED - register 0f3 in SIO. Low = on


For the entries marked as WIP, please see below.

Device/functionality Status Comments
CPU works OK AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
L1 cache enabled Unknown
L2 cache enabled Unknown
L3 cache enabled Unknown
Multiple CPU support N/A
Multi-core support OK AMD Athlon(tm) 64 X2 Dual Core Processor 3800+: htop and /proc/cpuinfo
Hardware virtualization Unknown
Dual channel support Unknown
ECC support N/A
On-board Hardware
On-board IDE 3.5" OK checked with a CD-ROM drive
On-board IDE 2.5" N/A
On-board SATA WIP
On-board SCSI N/A
On-board USB OK only checked two ports so far, for mouse and keyboard.
On-board VGA WIP
On-board Ethernet OK
On-board Audio WIP Front works, Surround doesn't
On-board Modem N/A
On-board FireWire N/A
On-board Smartcard reader N/A
On-board CompactFlash N/A
On-board PCMCIA N/A
On-board Wifi N/A
On-board Bluetooth N/A
On-board SD card reader N/A
Add-on slots/cards
ISA add-on cards N/A
Audio/Modem-Riser (AMR/CNR) cards N/A
PCI add-on cards OK
Mini-PCI add-on cards N/A
Mini-PCI-Express add-on cards Unknown
PCI-X add-on cards N/A
AGP graphics cards N/A
PCI Express x1 add-on cards OK
PCI Express x2 add-on cards N/A
PCI Express x4 add-on cards N/A
PCI Express x8 add-on cards N/A
PCI Express x16 add-on cards Unknown
PCI Express x32 add-on cards N/A
HTX add-on cards N/A
Legacy / Super I/O
Floppy Unknown
Serial port 1 (COM1) Unknown
Serial port 2 (COM2) N/A
Parallel port Unknown
PS/2 keyboard Unknown
PS/2 mouse Unknown
Game port N/A
Infrared Unknown
PC speaker Unknown
DiskOnChip N/A
Trackpoint N/A
Touchpad N/A
Fn Hotkeys N/A
Fingerprint Reader N/A
Docking VGA N/A
Docking LAN N/A
Docking USB N/A
Docking Audio N/A
Docking Displayport N/A
Thinklight N/A
Webcam N/A
Sensors / fan control Unknown
Hardware watchdog Unknown
SMBus Unknown
CAN bus N/A
CPU frequency scaling Unknown
Other powersaving features Unknown
ACPI Unknown
Reboot OK
Poweroff OK
Suspend Unknown
Nonstandard LEDs N/A
High precision event timers (HPET) Unknown
Random number generator (RNG) N/A
Wake on modem ring Unknown
Wake on LAN Unknown
Wake on keyboard Unknown
Wake on mouse Unknown
TPM Unknown
Flashrom OK

Known Issues


  • Using 2 512 MB DIMMs I got 756 MB of usable RAM (as opposed to 881 with the vendor BIOS).
  • With only 1 512 MB DIMM the system wouldn't boot.
  • With my 4 DIMMS from 3 vendors (2x A, 1x B, 1x C) I get the following boot chances. These might be related to another issue and not to the port of this board.
RAM and booting
DIMM configuration Boots?
A/A Yes
A No
A/A/B/C No
B/C/A/A Yes

Onboard VGA

  • In regard to the vendor BIOS the output numbers were switched. DVI-0 (vendor BIOS) was named HDMI-0 using coreboot.
  • Both VGA and DVI output worked.

PCI-E graphics adapter

  • Wouldn't work. With both plugged in and CONFIG_CONSOLE_VGA_ONBOARD_AT_FIRST not set there was no video output. I had the vgabios for the onboard adapter still inside the coreboot.rom however.

Keyboard in Grub

  • The (USB) keyboard in Grub doesn't respond correctly. Every keypress triggers multiple actions.


  • Linux wouldn't boot. It would start, then the screens were going blank and the machine hung.