ASUS M4A78LT-M

Status

Device/functionality	Status	Comments
CPU
CPU works	OK	Tested: AMD Athlon II X2 245e.
L1 cache enabled	Untested	Not tested yet
L2 cache enabled	Untested	Not tested yet
L3 cache enabled	N/A
Multiple CPU support	N/A
Multi-core support	OK
Hardware virtualization	Untested	Not tested yet
RAM
EDO	N/A
SDRAM	N/A
SO-DIMM	N/A
DDR	N/A
DDR2	N/A
DDR3	OK	2G works, see also #Known issues.
Dual channel support	Untested
ECC support	Untested
On-board Hardware
On-board IDE 3.5"	Untested
On-board IDE 2.5"	N/A
On-board SATA	OK	Tested on port 1, untested for the rest
On-board SCSI	Unknown
On-board USB	OK	Untested
On-board VGA	Untested
On-board ethernet	Untested
On-board audio	No	Linux driver crashes / Kernel panic. See also #Known issues.
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	Untested
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	Untested
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	Untested
PCI Express x32 add-on cards	N/A
HTX add-on cards	N/A
Legacy / Super I/O
Floppy	N/A
Serial port 1 (COM1)	OK	COM1 is only pin header on board. DB-9 serial connector is available, but not included with board.
Serial port 2 (COM2)	N/A
Parallel port	Untested
PS/2 keyboard	Untested
PS/2 mouse	N/A
Game port	N/A
Infrared	N/A
PC speaker	Untested
DiskOnChip	N/A
Miscellaneous
Sensors / fan control	Untested
Hardware watchdog	N/A
SMBus	Unknown
CAN bus	N/A
CPU frequency scaling	Untested
Other powersaving features	Untested
ACPI	Untested
Reboot	Untested
Poweroff	Untested
Suspend	Unknown
Nonstandard LEDs	Untested
High precision event timers (HPET)	Untested
Random number generator (RNG)	Untested
Wake on modem ring	Untested
Wake on LAN	Untested
Wake on keyboard	Untested
Wake on mouse	Untested
Flashrom	OK	The chip is SPI

Introduction

This pages is about the port to the M4A78LT-M, this mainboard is very similar to the M4A785-M, but:

• it has DDR3 instead of DDR2

Building Coreboot

To build coreboot:

• Apply that diff:

diff --git a/src/mainboard/asus/m4a785-m/Kconfig b/src/mainboard/asus/m4a785-m/Kconfig
index 84cc06c..25b3345 100644
--- a/src/mainboard/asus/m4a785-m/Kconfig
+++ b/src/mainboard/asus/m4a785-m/Kconfig
@@ -4,7 +4,8 @@ config BOARD_SPECIFIC_OPTIONS # dummy
        def_bool y
        select ARCH_X86
        select CPU_AMD_SOCKET_AM3
-       select DIMM_DDR2
+       select DIMM_DDR3
+       select DIMM_REGISTERED
        select NORTHBRIDGE_AMD_AMDFAM10
        select SOUTHBRIDGE_AMD_RS780
        select SOUTHBRIDGE_AMD_SB700

• select expert in make menuconfig and remove the microcode loading
• make

Known issues

• microcode update through coreboot leads into a freeze see also
• snd-hda-intel causes a Kernel panic, blacklist it
• The PCIe graphics card will be ignored completely, so not even listed by lspci see also
• A G.Skill 2G RAM Stick (F3-10666CL7D-4GBRH) didn't work while the F3-12800CL7D-4GBRM works fine, see also
• The P-State (Performance State) table isn't complete compared to the vendor BIOS see also