Add ASUS M4A785T-M mainboard support

This mainboard is very similar to the M4A785-M, but it has
  DDR3 instead of DDR2.

That's why most of the code was copied or included from
  the m4a785-m directory

Notable changes between the two mainboards include:
 * the selection of the last microcode (mc_patch_010000b6.h)
   which made it pass the CPU init.
 * the selection of DDR3 which made it pass the ram init

This change was tested with the Trisquel 5.0 GNU/Linux distribution
  which uses the linux-libre version 2.6.38-12-generic

The mainboard boots fine, however some special care is required for
  the onboard sound CODEC, and the onboard video chip:
  * the onboard sound CODEC(snd-hda-* has to be blacklisted), the issue
    is the same than the ASUS M4A785-M mainboard:
    It causes a flood of interupts which prevents booting
  * The internal video chip currently requires pci=nocrs, else
    the graphics are frozen as soon as the radeon module loads,
    and dmesg would print the following(the card only has 256M,
    and the mainboard was equiped with 2G of RAM):
      [    3.674762] [drm] radeon: 3584M of VRAM memory ready
      [    3.679863] [drm] radeon: 512M of GTT memory ready.
    instead of :
      [   45.876088] [drm] radeon: 256M of VRAM memory ready
      [   45.876089] [drm] radeon: 512M of GTT memory ready.
  * The screen(both VGA and HDMI) flickers at high resolution
  * Sometimes the computer freeze while changing the resolution
    (even the serial console stops responding)

The following peripherals were tested:
 * The ath9k PCI wireless card was tested
 * The SATA hard disk works fine
 * the USB keyboard and mouse work fine
 * htop see 2 cores
 * serial port works under coreboot and GNU/Linux
 * power off and reboot works

CPU frequency cannot be changed yet, this is addressed
  in a new commit.

More detail are available here:
  http://www.coreboot.org/ASUS_M4A785T-M

dmesg is available here:
  http://www.coreboot.org/pipermail/coreboot/2011-November/067604.html

The mailing list thread on the graphic problem is here:
  http://www.coreboot.org/pipermail/coreboot/2011-November/067466.html

Change-Id: I5df0bc1f9f0071b1e1ee7c8a356bf517aa8cf732
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Reviewed-on: http://review.coreboot.org/457
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

1 files changed, 106 insertions, 0 deletions

diff --git a/src/mainboard/asus/m4a785t-m/devicetree.cb b/src/mainboard/asus/m4a785t-m/devicetree.cb
new file mode 100644
index 0000000000..e8764b1eba
--- /dev/null
+++ b/src/mainboard/asus/m4a785t-m/devicetree.cb
@@ -0,0 +1,106 @@
+chip northbridge/amd/amdfam10/root_complex
+	device lapic_cluster 0 on
+		chip cpu/amd/socket_AM3  #L1 and DDR2
+			 device lapic 0 on end
+		end
+	end
+	device pci_domain 0 on
+		subsystemid 0x1043 0x83a2 inherit
+		chip northbridge/amd/amdfam10
+			device pci 18.0 on #  northbridge
+				chip southbridge/amd/rs780
+					device pci 0.0 on end # HT  	0x9600
+					device pci 1.0 on end # Internal Graphics P2P bridge 0x9602
+					device pci 2.0 off end # PCIE P2P bridge (external graphics) 0x9603
+					device pci 3.0 off end # PCIE P2P bridge	0x960b
+					device pci 4.0 off end # PCIE P2P bridge 0x9604
+					device pci 5.0 off end # PCIE P2P bridge 0x9605
+					device pci 6.0 off end # PCIE P2P bridge 0x9606
+					device pci 7.0 off end # PCIE P2P bridge 0x9607
+					device pci 8.0 off end # NB/SB Link P2P bridge
+					device pci 9.0 off end #
+					device pci a.0 on end # bridge to RTL8111/8168B PCI Express Gigabit Ethernet
+					register "gppsb_configuration" = "1"   # Configuration B
+					register "gpp_configuration" = "3"   # Configuration D default
+					register "port_enable" = "0x6fc"
+					register "gfx_dev2_dev3" = "1"
+					register "gfx_dual_slot" = "2"
+
+					register "gfx_lane_reversal" = "0"
+					register "gfx_tmds" = "0"
+					register "gfx_compliance" = "0"
+					register "gfx_reconfiguration" = "1"
+					register "gfx_link_width" = "0"
+				end
+				chip southbridge/amd/sb700 # it is under NB/SB Link, but on the same pri bus
+					device pci 11.0 on end # SATA
+					device pci 12.0 on end # USB
+					device pci 12.1 on end # USB
+					device pci 12.2 on end # USB
+					device pci 13.0 on end # USB
+					device pci 13.1 on end # USB
+					device pci 13.2 on end # USB
+	 				device pci 14.0 on # SM
+						chip drivers/generic/generic #dimm 0-0-0
+							device i2c 50 on end
+						end
+						chip drivers/generic/generic #dimm 0-0-1
+							device i2c 51 on end
+						end
+						chip drivers/generic/generic #dimm 0-1-0
+							device i2c 52 on end
+						end
+						chip drivers/generic/generic #dimm 0-1-1
+							device i2c 53 on end
+						end
+					end # SM
+					device pci 14.1 on end # IDE    0x439c
+					device pci 14.2 on end # HDA    0x4383
+					device pci 14.3 on # LPC	0x439d
+						chip superio/ite/it8712f
+							device pnp 2e.0 off end #  Floppy
+							device pnp 2e.1 on #  Com1
+								io 0x60 = 0x3f8
+								irq 0x70 = 4
+							end
+							device pnp 2e.2 off #  Com2
+								io 0x60 = 0x2f8
+								irq 0x70 = 3
+							end
+							device pnp 2e.3 off #  Parallel Port
+								io 0x60 = 0x378
+								irq 0x70 = 7
+							end
+							device pnp 2e.4 off end #  Environment Controller
+							device pnp 2e.5 on #  Keyboard
+								io 0x60 = 0x60
+								io 0x62 = 0x64
+								irq 0x70 = 1
+							end
+							device pnp 2e.6 on #  Mouse
+								irq 0x70 = 12
+							end
+							device pnp 2e.7 off #  GPIO, must be closed for unresolved reason.
+							end
+							device pnp 2e.8 off #  MIDI
+							end
+							device pnp 2e.9 off #  GAME
+							end
+							device pnp 2e.a off end #  CIR
+						end	#superio
+					end		#LPC
+					device pci 14.4 on end # PCI to PCI Bridge [1002:4384]
+					device pci 14.5 on end # USB 2
+					register "boot_switch_sata_ide" = "0"	# 0: boot from SATA. 1: IDE
+				end	#southbridge/amd/sb700
+			end #  device pci 18.0
+
+			device pci 18.0 on end
+			device pci 18.0 on end
+			device pci 18.1 on end
+			device pci 18.2 on end
+			device pci 18.3 on end
+			device pci 18.4 on end
+		end # chip northbridge
+	end #pci_domain
+end # northbridge/amd/amdfam10/root_complex