This page is a walk through on obtaining Direct Rendering on a mach64 graphics chipset
The Mach 64 Board
The Mach64 Chip is made by ATI, coming in several varieties. This page is targeted at the Rage Pro variant, which to my knowledge is the only 3D version of the mach64. Wikipedia: Mach64/Rage Pro This board has basic 3D capabilites, but Arch's xf86-video-ati package, which contains open source ATI drivers does not contain support for it.
Most GNU/Linux 3D graphics drivers use the DRI/DRM system for direct rendering, which is what the Mach64 Driver uses this.
Packages and References
- mesa - installs the mesa GL libs - Install this with pacman.
- libgl - installs the gl libs (part of the 'official' mesa source tree) (). - install this with pacman
- libdrm - installs the drm libs - install this with pacman
- xf86-video-mach64 - installs the dri files.
- DRM - the kernel module that controls DMA, AGP memory management, resource locking, and secure hardware access.
- DRI - Direct Rendering Infrastructure - The X Server Driver. This allows the X server to communicate with the Graphics Card, translating OpenGL into instructions for the video card.
Building the Kernel Drm Module - with makepkg goodness
Since kernel 2.6.27, The in tree DRM is no longer compatible with the mach64 drm. The kernel must be compiled as follows:
Device Drivers ---> Graphics Support ---> < > Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) ---> (CONFIG_DRM=n) Must be disabled.
If you are using the standard Arch kernel, you must either recompile the kernel or obtain the AUR package "kernel26-nodrm."
After your kernel is properly configured, install the AUR package "mach64drm," which will install the kernel modules compiled from out of tree DRI sources.
Installing the other end: DRI
The new Xorg (1.5.3) brought with it a new driver structure, which included a separate package for the mach64, giving users a mach64 package without having to recompile like with previous Xorg servers. (previously, xf86-video-ati had to be modified to compile mach64 when it was built).
This has made the process of installing DRI much easier, entailing:
pacman -S xf86-video-mach64
This is what my the Device section in my xorg.conf looks like:
Section "Device" Identifier "Card0" Driver "mach64" #most important, allows you to use the mach64 driver Card "ATI Rage Pro - Mach64" Option "DMAMode" "async" #async - default, sync (synchronous DMA), mmio (PIO/MMIO) - Dispatch Buffers. Option "ForcePCIMode" "false" #Boolean, disables AGP aperture. Set to True if you have a PCI card. Option "AgpMode" "2" #(AGP 1x or 2x) valid options: 1 or 2. If not set, defaults to agpgart's mode Option "AgpSize" "32" #Sets the AGP aperture in MB - The video card can access this amount of system memory using AGP and shared access in order to expand its memory capacity - enlarging this allows more textures to be stored here. Option "BufferSize" "2" #Sets DMA buffer memory size in MB. Default is 2 MB. May be 1 or 2. Option "LocalTextures" "true" #By default, AGP cards will only use AGP memory for textures. To force using local card memory for textures in addition to AGP, you may set this option to true. boolean. #The AgpSize option changes the amount of system memory used for the AGP aperture and is not limited by the size of the card's on-board video memory. This memory is used for the DMA buffers (BufferSize option), and the remainder is allocated for AGP textures. Of course, the AgpMode/AgpSize options are ignored for PCI cards or if ForcePCIMode is enabled on an AGP card. However, the BufferSize option can be used to change the size of the DMA buffers in system memory for both PCI and AGP cards (but it's not recommended to reduce the buffer size unless you are short on system RAM). http://www.retinalburn.net/linux/dri_status.html #see "Status and known issues for mach64 branch of DRI EndSection
The Modules Section:
Section "Module" <Your modules> Load "glx" Load "dri" EndSection
The DRI Section:
Section "DRI" Mode 0666 #allows anybody to use DRI EndSection
The DRI Section (For machines where security is a concern):
Section "DRI" Group "video" #Change to any desired group to restrict access Mode 0660 EndSection
After you're in X, you can run the command
glxinfo | egrep "direct rendering|OpenGL renderer"
This should return something like this:
direct rendering: Yes OpenGL renderer string: Mesa DRI Mach64 [Rage Pro] 20051019 AGP 2x x86/MMX/SSE
If OpenGL renderer string says "Software Rasterizer," DRI is not working, even if direct rendering says "yes"
Building the Kernel Drm Module - the Old Way without pacman
warning: this does not use the makepkg method, which is recommended. Please use the AUR packages (top of this document) or create your own. Skip this section if you did the section above, with makepkg. Go to "Installing the other end: DRI."
The standard ARCH kernel doesn't come with the mach64 DRM module, so building yourself is required.
- Create a build folder to keep things tidy - this folder will be referred to from now on as $BUILDDIR
- Now, obtain the drm source tree:
- Get the thing compiled: (the drm folder appeared out of git)
cd $BUILDDIR/drm/linux-core/ make DRM_MODULES="mach64"
- Go get some coffee or something since your machine is probably very old to have a mach64 chipset and wait while everything compiles.
- When it's done compiling, there will be two files,
mach64.ko, the device kernel module, and
drm.ko, the DRM generic module.
- Copy those two files to the appropriate kernel modules directory. (Before doing this you may want to backup the exisiting files to somewhere else just in case).
sudo cp mach64.ko drm.ko /lib/modules/`uname -r`/kernel/drivers/char/drm/
- Now get the modules registered and depedencies generated.
sudo depmod -a `uname -r`