CIRRUS(4) UNIX Programmer's Manual CIRRUS(4)
cirrus - Cirrus Logic video driver
Section "Device" Identifier "devname" Driver "cirrus" ... EndSection
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.
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 XFree86 Version 4.5.0 1 CIRRUS(4) UNIX Programmer's Manual CIRRUS(4) CL-GD7556
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 XFree86 Version 4.5.0 2 CIRRUS(4) UNIX Programmer's Manual CIRRUS(4) 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 of this document include: Scot Wilcoxon (Scot@Wilcoxon.org), authors of mga(4x). XFree86 Version 4.5.0 3
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