`devg-coral.so`

Graphics driver for Fujitsu Coral chipsets

Syntax:

io-graphics -d coral [option[,option...]] ... &

Options:

For the general io-graphics options that can be used with this driver, see io-graphics.

Options specific to this driver:

mode_opts=config-file: The full path to coral.conf, the configuration file for this driver.

Description:

The devg-coral.so driver provides accelerated 2D support for the Fujitsu Coral graphics controller.

You can edit the coral.conf configuration file to enable devg-coral.so to run on your board. Follow the editing instructions in this file to specify the correct configuration for the required display mode. (For a more detailed explanation of the display settings, see the appropriate Fujitsu documentation.)

You must specify the location of the configuration file to the devg-coral driver via the mode_opts option of io-graphics For example:

io-graphics -d coral xres=640,yres=480,bitpp=15,photon,mode_opts=/etc/photon/config/coral.conf -pphoton

Supported chipsets

Fujitsu MB86294 Coral B
Fujitsu MB86295 Coral P
Fujitsu MB86296 Coral PA

Acceleration features

Feature	Provision
Solid fills	Yes
Bresenham lines	Yes
Pattern fills	No
Polygons	Yes
Onscreen blitting	Yes
Offscreen blitting	Yes
Chroma-keyed blitting	Yes
Alpha blending	No
Raster OP's	Full
Bitmaps	Yes

Video Overlay/Scaler support

Feature	Provision
YUV formats	Yes
RGB formats	Yes
Up scaling	No

Other features

Feature	Provision
Hardware Cursor	Yes
TV Out	No
Video capture	Yes
DPMS (power saving)	Yes
Layers supported	6

Resolution and refresh support

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

Restrictions:

You can use the driver-configuration file to specify other resolutions and refresh rates.

The `coral.conf` file and dual-head

The coral.conf file provides additional control over the driver, including dual-head support (dual-head display is supported by Coral-PA-based devices only). This file is also required for providing additional configuration for panel displays. The file (by default located in usr/photon/config/) contains a description of each option, and several pre-configured command-lines for various Coral device and display combinations.

For dual-head configurations, both displays will run at the same resolution/refresh rate - independent control is not available.

The Coral-PA reference card does not support dual-display on its own, a special adapter card is necessary.

In coral.conf there are two parameters of note:

dlayers -- SC0en & SC1en fields for Multi-Display Control register
dmode -- Dual Display mode (0 = single display, 1 = dual parallel mode, 2 = dual multiplexed mode)

In the Coral-PA Documentation (section 7.10 Dual Display) you'll see that the SC0-en field of the Multi-Display Control register defines which layers and cursors are included in screen 0, and the SC1-en field defines which layers and cursors are included in screen 1. A layer of cursor can be included in one or both screens.

SC0en and SC1en are 8-bit values. The dlayers parameter is 16-bit with SC1 being the top 8-bits. A 1 indicates the layer is included in the display.

The bit layout for the dlayers parameter is as follows:

bit	description
`0`	L0 is included in screen 0
`1`	L1 is included in screen 0
`2`	L2 is included in screen 0
`3`	L3 is included in screen 0
`4`	L4 is included in screen 0
`5`	L5 is included in screen 0
`6`	Cursor0 is included in screen 0
`7`	Cursor1 is included in screen 0
`8`	L0 is included in screen 1
`9`	L1 is included in screen 1
`10`	L2 is included in screen 1
`11`	L3 is included in screen 1
`12`	L4 is included in screen 1
`13`	L5 is included in screen 1
`14`	Cursor 0 is included in screen 1
`15`	Cursor 1 is included in screen 1

The devg-coral.so driver only supports Cursor 0.

To include all layers and cursors on both displays, set dlayers=0xFFFF (This is the default). The driver default for dmode is 0 for single display.

There are two modes to output two screens. In parallel mode, one screen is output at digital RGB while another is output at analog RGB. In multiplex mode, two screens are multiplexed and output at digital RGB. Which version is used will depend on hardware and requirements.

For example, to run in parallel mode with Layers 0, 1 and Cursor 0 on screen 0 and the rest of the layers on screen 1 you would set:

    dlayers=0xBC83
    dmode=1

The application code needs to then connect and draw to the proper layers.

Files:

This driver needs the following files available at run time:

libdisputil.so: Graphics driver utility library.
libffb.so: Software rasterization library.

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