MirOS Manual: cirrus(4)


CIRRUS(4)           UNIX Programmer's Manual            CIRRUS(4)

NAME

     cirrus - Cirrus Logic video driver

SYNOPSIS

     Section "Device"
       Identifier "devname"
       Driver "cirrus"
       ...
     EndSection

DESCRIPTION

     cirrus is an XFree86 driver for Cirrus Logic video chips.
     The driver provides support for the following framebuffer
     depths: 8, 15, 16, 24, 32 bpp. The cirrus_alpine module also
     supports 1 and 4 bpp. Conversion of 32 bpp to 24 bpp is sup-
     ported and preferred.

     Interlace is not supported. DGA is supported. RAMDAC speed
     may be specified.

SUPPORTED HARDWARE

     The cirrus driver supports several chipsets through two
     automatically loaded modules.

     CL-GD546x support is in the cirrus_laguna

     CL-GD5462

     CL-GD5464

     CL-GD5464BD

     CL-GD5465

     cirrus_alpine module:

     CL-GD5430

     CL-GD5434-4

     CL-GD5434-8

     CL-GD5436

     CL-GD5446

     CL-GD5480

     CL-GD7548

     CL-GD7555

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     CL-GD7556

CONFIGURATION DETAILS

     Please refer to XF86Config(5) for general configuration
     details.  This section only covers configuration details
     specific to this driver.

     The following driver Options are supported:

     cirrus_laguna module:
          ChipRev HWcursor NoAccel Rotate ShadowFB

     cirrus_alpine module:
          ChipRev HWcursor MemCFG1 MemCFG2 MMIO NoAccel Rotate
          ShadowFB

     VideoRam
          If VideoRam is specified, that setting is respected and
          memory is not probed.

     Option "Clocks"
          Clocks line may not be specified for Cirrus chips.

     Option "HWCursor" "boolean"
          Enable or disable the HW cursor. Hardware cursor sizes
          of 32 and 64 are supported in the "Alpine" module.
          Hardware cursor size of 64 is supported in the "Laguna"
          module. Default: on for 7548, 7555/6; otherwise off.

     Option "MemCFG1" "integer"

     Option "MemCFG2" "integer"
          May configure memory on non-primary cards. "Alpine"
          module does not yet know how to configure memory. Use
          options MemCFG1 and MemCFG2 to set registers SR0F and
          SR17 before trying to count ram size. The 754x supports
          MMIO for the BitBlt engine but not for the VGA regis-
          ters. The 754x may have difficulty with 2 256K X 16
          DRAMs (1024) or 4 512K X 8 DRAMs (2048). The 7555/6
          assumes 2048. Default: memory automatically detected.

     Option "MMIO" "boolean"
          By default, MMIO is used if we have a separate IOAd-
          dress and not in monochrome mode (1 bpp). When MMIO is
          not used, RAC IO flags RAC_COLORMAP, RAC_CURSOR,
          RAC_VIEWPORT, and RAC_FB are set. Default: on

     Option "NoAccel" "boolean"
          Disable or enable acceleration. Acceleration can not be

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          used in less than 8 bpp. Default: Acceleration disabled
          for 5436, 5480, 7548; otherwise enabled.

     Option "PciRetry" "boolean"
          Enable or disable PCI retries.  Default: off.

     Option "Rotate" "CW"

     Option "Rotate" "CCW"
          Rotate the display clockwise or counterclockwise. This
          mode is unaccelerated. This mode forces use of the sha-
          dow framebuffer layer. Screen depth must be less than 8
          bpp with "Alpine" module. HW cursor is disabled with
          Rotate. Default: no rotation.

     Option "ShadowFB" "boolean"
          Enable or disable use of the shadow framebuffer layer.
          This mode is unaccelerated. Screen depth must be less
          than 8 bpp with "Alpine" module. Default: off.

     XFree86(1), XF86Config(5), xf86config(1), Xserver(1), X(7)

AUTHORS

     Authors of this document include: Scot Wilcoxon
     (Scot@Wilcoxon.org), authors of mga(4x).

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