MGX(4) - Device Drivers Manual (sparc64)

MGX(4) - Device Drivers Manual (sparc64) #

MGX(4) - Device Drivers Manual (sparc64)

NAME #

mgx - SMS MGX and MGXPlus accelerated 8/24-bit color frame buffers

SYNOPSIS #

mgx* at sbus? wsdisplay* at mgx?

DESCRIPTION #

The Southland Media Systems (now Quantum 3D) MGX and MGXPlus are SBus color frame buffers, with graphics acceleration capabilities.

The mgx driver interfaces the frame buffer with the wscons(4) console framework. It does not provide direct device driver entry points but makes its functions available via the internal wsdisplay(4) interface.

DISPLAY RESOLUTION #

The MGX and MGXPlus frame buffers will adapt their resolution to the monitor they are connected to. However, when not connected to a Sun monitor, the device will default to the cgthree(4)-compatible 1152x900 resolution, with a refresh rate of 66Hz. A different resolution can be forced using the set of DIP switches (sometimes covered by metal foil) located near the SBus connector on the board itself.

The DIP switch settings are as follows:

**Switches**       **Resolution** **Refresh Rate** **Details**  
**1   2   3   4**                                  
`OFF OFF OFF OFF`  1024x768      77Hz              
`OFF ON  OFF OFF`  1280x1024     76Hz              
`ON  ON  OFF OFF`  1152x900      66Hz              
`OFF OFF ON  OFF`  1152x900      76Hz              
`OFF ON  ON  OFF`  1152x900      77Hz              
`ON  ON  ON  OFF`  1152x900      66Hz            cgthree compatible  
`ON  ON  OFF ON `  1152x900      66Hz            cgsix compatible  
`OFF OFF ON  ON `  1280x1024     67Hz              
`ON  ON  ON  ON `  probed        probed          factory default

All other combinations are unsupported and may damage the hardware.

SEE ALSO #

intro(4), sbus(4), wscons(4), wsdisplay(4)

CAVEATS #

This driver does not support mode switching at the moment, and drives the card in PROM-compatible, 8 bit, mode only.

OpenBSD 7.5 - December 3, 2011