mb/acer/g43t-am3: add Acer G43T-AM3 mainboard

Adds a new port for the Aspire G43T-AM3. It is from an Aspire M3800
desktop model of which I only own the mainboard. The silkscreen label
calls it "G45T/G43T-AM3 V:1.0". In DMI data it is additionally called
Acer EG43M.

The Aspire M5800 model seems to use the same mainboard. The BIOS you can
download from Acer is identical for both.

Various similar mainboards by Acer exist: G41T-AM, G43T-AM, G43T-AM4,
Q45T-AM, to name a few. ECS has some models that are obiously based on
the same design, e.g. G43T-WM and G43T-M.

This model is a microATX-sized board with an LGA 775 socket, four DDR3
DIMM slots, one PCIe x16 slot, one PCIe x1 slot and two PCI slots based
on the Intel G43 chipset.

The port was started by copying mb/intel/dg43gt (not going to lie here)
and adapting things by looking at dumps from the system when running
with the vendor BIOS. Serial console output is possible by soldering to
a point at the corresponding Super I/O pin.

The service manual for the board was helpful for setting the correct PCI
IRQ links. It can be found publicly on the internet as the "Acer Aspire
M3800 Service Manual".

Working:
- CPUs from Pentium Dual-Core E2160 to Core 2 Quad Q9550 at FSB1333
- Native raminit
- All four DIMM slots at 1066 MHz (tested 2x2GB + 2x4GB)
- PS/2 mouse
- PS/2 keyboard (needs CONFIG_SEABIOS_PS2_TIMEOUT, tested: 500)
- USB ports (8 internal, 4 external)
- All six SATA ports
- Intel GbE
- Both PCI ports with various cards (Ethernet, audio, USB, VGA)
- Integrated graphics (libgfxinit)
- HDMI and VGA ports
- boot with PCIe graphics and SeaBIOS
- boot with PCI VGA and SeaBIOS
- Both PCIe ports
- Flashing with flashrom
- Rear audio output
- SeaBIOS 1.14.0 to boot slackware64
- SeaBIOS 1.14.0 to boot Windows 10 (needs VGA BIOS)
- Temperature readings (including PECI)
- Super I/O EC automatic fan control
- S3 suspend/resume
- Poweroff

Not working:
- Resource issues with the VGA BIOS of a PCI rv100-based card
- Super I/O voltage reading conversions

Untested:
- The other audio jacks or the front panel header
- On-board Firewire
- EHCI debug
- VBT (was extracted and added, but don't know how to test)
- Super I/O GPIOs

Signed-off-by: Michael Büchler <michael.buechler@posteo.net>
Change-Id: I846cf5f4f1ef27fc644676a4c6f7a333e061f6cf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44167
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mainboard/acer/g43t-am3/cmos.default b/src/mainboard/acer/g43t-am3/cmos.default
new file mode 100644
index 0000000000..706f5dd551
--- /dev/null
+++ b/src/mainboard/acer/g43t-am3/cmos.default
@@ -0,0 +1,6 @@
+boot_option=Fallback
+debug_level=Debug
+power_on_after_fail=Disable
+nmi=Enable
+sata_mode=AHCI
+gfx_uma_size=64M