ASRock 939A785GMH-128M

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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.

SuperIO

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

PCIe x16

Reset signal is through GPIO - GPM8,GPM9, 0 asserts reset, 1 de-asserts reset.

Status

For the entries marked as WIP, please see below.

Device/functionality	Status	Comments
CPU
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
RAM
EDO	N/A
SDRAM	N/A
SO-DIMM	N/A
DDR	WIP
DDR2	N/A
DDR3	N/A
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
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
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
Miscellaneous
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
Flashrom	OK

Known Issues

RAM

Ruik tests

• use 2x 512MB CAS 2.5 DDR400
• blue slots populated = dualchannel mode (works)
• all slots populated (with additional RAM) - strange UMA artefacts
• only channel0 populated (DDR1 and DDR3 slot, DDR1 is closest to CPU) - strange UMA artefacts
• single memory stick in DDR1 slot - works

Lennart tests

• blue slots populated - works
• all slots populated -- doesn't boot
  • hangs on "Clearing initial memory region:"
• only channel0 populated - doesn't boot
  • hangs on "Clearing initial memory region:"
• single DIMM in DDR1 - works.

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.

Kernel

• Linux 2.6.35.2 wouldn't boot. It would start, then the screens were going blank and the machine hung.