Board:asus/a8n e

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ASUS A8N-E, rev. 2.00

This HOWTO explains how to use coreboot on the ASUS A8N-E board.

Status

Device/functionality Status Comments
CPU
CPU works OK Tested: AMD Athlon(tm) 64 Processor 3000+.
L1 cache enabled OK CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
L2 cache enabled OK CPU: L2 Cache: 512K (64 bytes/line)
L3 cache enabled N/A
Multiple CPU support N/A
Multi-core support Untested
Hardware virtualization N/A
RAM
EDO N/A
SDRAM N/A
SO-DIMM N/A
DDR OK Tested with one DIMM in slot DIMM_B1 (see manual).
DDR2 N/A
DDR3 N/A
Dual channel support Untested
ECC support Untested The board supports ECC according to the manual.
On-board Hardware
On-board IDE 3.5" OK Tested: Primary IDE (master and slave) and secondary IDE (master and slave).
On-board IDE 2.5" N/A
On-board SATA WIP Port 3 (hde in FILO) and 4 (hdg in FILO) on the board work fine. Port 1 and 2 don't seem to work, this is being investigated.
On-board SCSI Unknown
On-board USB OK Tested: USB keyboard (on each of the 10 possible USB ports).
On-board VGA N/A
On-board ethernet OK
On-board audio Untested
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 Tested: PCI VGA card in all three PCI slots.
Mini-PCI add-on cards Unknown
PCI-X add-on cards Unknown
AGP graphics cards N/A
PCI Express x1 add-on cards OK Both PCIe x1 slots works fine (tested with a network card).
PCI Express x2 add-on cards N/A
PCI Express x4 add-on cards Untested
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 Untested
Serial port 1 (COM1) OK
Serial port 2 (COM2) N/A
Parallel port OK Tested: modprobe ppdev, further tests were not performed.
PS/2 keyboard OK Works since r3610,
PS/2 mouse OK Works since r3610,
Game port Untested
Infrared N/A
PC speaker OK
DiskOnChip N/A
Miscellaneous
Sensors / fan control OK Tested: sensors reports K8 core temp. (kernel module k8temp) and various other values from the IT8712F Super I/O (kernel module it87).
Hardware watchdog N/A
SMBus Unknown
CAN bus N/A
CPU frequency scaling No Needs (at least partial) ACPI support.
Other powersaving features N/A
ACPI No There's no ACPI implementation for this board.
Reboot OK
Poweroff No
Suspend Unknown
Nonstandard LEDs OK There's a green LED on the board which is enabled when the board is powered-on. Works out of the box, no special coreboot support required.
High precision event timers (HPET) OK The hardware supports it, but you currently need the hpet=force Linux kernel parameter. Reduces the number of wakeups in powertop drastically.
Random number generator (RNG) N/A
Wake on modem ring Untested
Wake on LAN N/A The on-board ethernet device doesn't seem to support WOL (also not mentioned in the manual).
Wake on keyboard Untested
Wake on mouse Untested
Flashrom OK Works fine when booted with BIOS and also with coreboot.

Building coreboot

$ svn co svn://coreboot.org/repos/trunk/coreboot-v2
$ cd coreboot-v2/targets
$ ./buildtarget asus/a8n_e
$ cd asus/a8n_e/asus_a8n_e

Now place your payload in this directory and name it payload.elf. Complete the build with:

$ make

The resulting coreboot.rom file (512 KB) can now be flashed using e.g. flashrom.

Known issues

  • Single DIMM support only: the blue DIMM_B1 socket should be populated only (for now).
  • The MAC address is stored in flash for almost all CK804/MCP55 boards. All of these boards flashed with coreboot probably have the same MAC address. See src/southbridge/nvidia/ck804/romstrap.inc and src/southbridge/nvidia/mcp55/romstrap.inc for details. On some of these boards, the MAC address is stored in a separate EEPROM, but you can't count on that.

TODO

If you can help out with this, please join the mailing list and let us know!

GNU head This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.