# SPDX-License-Identifier: GPL-2.0-only # # fbdev core configuration # config FB_CORE select VIDEO_CMDLINE tristate config FB_NOTIFY bool config FIRMWARE_EDID bool "Enable firmware EDID" depends on FB help This enables access to the EDID transferred from the firmware. On the i386, this is from the Video BIOS. Enable this if DDC/I2C transfers do not work for your driver and if you are using nvidiafb, i810fb or savagefb. In general, choosing Y for this option is safe. If you experience extremely long delays while booting before you get something on your display, try setting this to N. Matrox cards in combination with certain motherboards and monitors are known to suffer from this problem. config FB_DEVICE bool "Provide legacy /dev/fb* device" depends on FB_CORE default FB help Say Y here if you want the legacy /dev/fb* device file and interfaces within sysfs anc procfs. It is only required if you have userspace programs that depend on fbdev for graphics output. This does not affect the framebuffer console. If unsure, say N. config FB_DDC tristate depends on FB select I2C_ALGOBIT select I2C config FB_CFB_FILLRECT tristate depends on FB_CORE help Include the cfb_fillrect function for generic software rectangle filling. This is used by drivers that don't provide their own (accelerated) version. config FB_CFB_COPYAREA tristate depends on FB_CORE help Include the cfb_copyarea function for generic software area copying. This is used by drivers that don't provide their own (accelerated) version. config FB_CFB_IMAGEBLIT tristate depends on FB_CORE help Include the cfb_imageblit function for generic software image blitting. This is used by drivers that don't provide their own (accelerated) version. config FB_CFB_REV_PIXELS_IN_BYTE bool depends on FB_CORE help Allow generic frame-buffer functions to work on displays with 1, 2 and 4 bits per pixel depths which has opposite order of pixels in byte order to bytes in long order. config FB_SYS_FILLRECT tristate depends on FB_CORE help Include the sys_fillrect function for generic software rectangle filling. This is used by drivers that don't provide their own (accelerated) version and the framebuffer is in system RAM. config FB_SYS_COPYAREA tristate depends on FB_CORE help Include the sys_copyarea function for generic software area copying. This is used by drivers that don't provide their own (accelerated) version and the framebuffer is in system RAM. config FB_SYS_IMAGEBLIT tristate depends on FB_CORE help Include the sys_imageblit function for generic software image blitting. This is used by drivers that don't provide their own (accelerated) version and the framebuffer is in system RAM. config FB_PROVIDE_GET_FB_UNMAPPED_AREA bool depends on FB help Allow generic frame-buffer to provide get_fb_unmapped_area function to provide shareable character device support on nommu. menuconfig FB_FOREIGN_ENDIAN bool "Framebuffer foreign endianness support" depends on FB help This menu will let you enable support for the framebuffers with non-native endianness (e.g. Little-Endian framebuffer on a Big-Endian machine). Most probably you don't have such hardware, so it's safe to say "n" here. choice prompt "Choice endianness support" depends on FB_FOREIGN_ENDIAN config FB_BOTH_ENDIAN bool "Support for Big- and Little-Endian framebuffers" config FB_BIG_ENDIAN bool "Support for Big-Endian framebuffers only" config FB_LITTLE_ENDIAN bool "Support for Little-Endian framebuffers only" endchoice config FB_SYS_FOPS tristate depends on FB_CORE config FB_DEFERRED_IO bool depends on FB_CORE config FB_DMAMEM_HELPERS bool depends on FB_CORE select FB_SYS_COPYAREA select FB_SYS_FILLRECT select FB_SYS_FOPS select FB_SYS_IMAGEBLIT config FB_IOMEM_HELPERS bool depends on FB_CORE select FB_CFB_COPYAREA select FB_CFB_FILLRECT select FB_CFB_IMAGEBLIT config FB_SYSMEM_HELPERS bool depends on FB_CORE select FB_SYS_COPYAREA select FB_SYS_FILLRECT select FB_SYS_FOPS select FB_SYS_IMAGEBLIT config FB_SYSMEM_HELPERS_DEFERRED bool depends on FB_CORE select FB_DEFERRED_IO select FB_SYSMEM_HELPERS config FB_BACKLIGHT tristate depends on FB select BACKLIGHT_CLASS_DEVICE config FB_MODE_HELPERS bool "Enable Video Mode Handling Helpers" depends on FB help This enables functions for handling video modes using the Generalized Timing Formula and the EDID parser. A few drivers rely on this feature such as the radeonfb, rivafb, and the i810fb. If your driver does not take advantage of this feature, choosing Y will just increase the kernel size by about 5K. config FB_TILEBLITTING bool "Enable Tile Blitting Support" depends on FB help This enables tile blitting. Tile blitting is a drawing technique where the screen is divided into rectangular sections (tiles), whereas the standard blitting divides the screen into pixels. Because the default drawing element is a tile, drawing functions will be passed parameters in terms of number of tiles instead of number of pixels. For example, to draw a single character, instead of using bitmaps, an index to an array of bitmaps will be used. To clear or move a rectangular section of a screen, the rectangle will be described in terms of number of tiles in the x- and y-axis. This is particularly important to one driver, matroxfb. If unsure, say N.