`devg-smi7xx.so`

Graphics driver for Silicon Motion Lynx chipset

Syntax:

io-display [-vf]
           -d vid=[0x]vendor_id,did=[0x]device_id[,deviceindex=index]
           [-c config_file] [-p priority]

Options:

For the general io-display options that you can use with this driver, see io-display.

You can set configuration options that are specific to this driver by using the modeopts setting in display.conf:

modeopts=config-file: The full path to the configuration file for this driver. For example smi7xx.conf is located in /usr/photon/config by default so that modeopts=/usr/photon/config/smi7xx.conf.

Description:

The devg-smi7xx.so driver provides accelerated 2D support for the specified graphics chipset.

You can edit the configuration file to enable devg-smi7xx.so to run on your board. Follow the editing instructions in the sample file, /usr/photon/config/smi7xx.conf, to specify the correct configuration for the required display mode. (For a more detailed explanation of the display settings, see the appropriate Silicon Motion documentation.)

If you use a configuration file for this driver, you must use the modeopts option in your display.conf to specify its location.

Graphics drivers run at a higher priority than applications, but they shouldn't run at a higher priority than the audio, or else breaks in the audio occur. You can use the on command to adjust the priorities of the audio and graphics drivers.

Supported chipsets

Lynx3DM+ (SM721/SM722)

Acceleration features

Feature	Provision
Solid fills	Yes
Pattern fills	No
Onscreen blitting	Yes
Offscreen blitting	Yes
Chroma-keyed blitting	Yes
Alpha blending	No
Raster OPs	Full

Video Overlay/Scaler support

Feature	Provision
YUV formats	Yes
RGB formats	Yes
Up scaling	Yes
Down scaling	No

Other features

Feature	Provision
Hardware Cursor	Yes
TV Out	No
Video capture	No
DPMS (power saving)	Yes
Layer Support	3 layers
Dual display	No

Resolution and refresh support

Display size (pixels)	Refresh rate(Hz)	Color depth (bits per pixel)
640x480	60	8, 15, 16, 24
800x600	60	8, 15, 16, 24^a
1024x768	60	8, 15, 16, 24^a

^a Requires a driver configuration file for non-x86 systems.

Restrictions:

These are typical values; the actual ones may depend on your BIOS (x86) and monitor. You can use the configuration file to set up other resolutions and refresh rates.
LCD output isn't supported by default on non-x86 platforms.

Files:

This driver needs the following at run time:

libffb.so: Software rasterization library.