What is a framebuffer device?
The frame buffer device provides an abstraction for the graphics hardware. It represents the frame buffer of some video hardware and allows application software to access the graphics hardware through a well-defined interface, so the software doesn’t need to know anything about the low-level (hardware register) stuff.
How do I enable framebuffer console?
The framebuffer console can be enabled by using your favorite kernel configuration tool. It is under Device Drivers->Graphics Support-> Console display driver support->Framebuffer Console Support. Select ‘y’ to compile support statically or ‘m’ for module support. The module will be fbcon.
What is framebuffer console?
The framebuffer console (fbcon), as its name implies, is a text console running on top of the framebuffer device. It has the functionality of any standard text console driver, such as the VGA console, with the added features that can be attributed to the graphical nature of the framebuffer.
What is FbTerm?
FbTerm is a fast terminal emulator for linux with frame buffer device or VESA video card. Features include: mostly as fast as terminal of linux kernel while accelerated scrolling is enabled. select font with fontconfig and draw text with freetype2, same as Qt/Gtk+ based GUI apps.
What is the pitch of a framebuffer?
The Pitch of a framebuffer is simply the number of bytes that are in each row on screen. We can calculate the Pixels Per Row by pitch / (depth / 8) , or equivalently (pitch * 8) / depth .
What is a frame buffer device in Linux?
From the user’s point of view, the frame buffer device looks just like any other device in /dev. It’s a character device using major 29; the minor specifies the frame buffer number. By convention, the following device nodes are used (numbers indicate the device minor numbers):
Are there in-kernel APIs between device drivers and the frame buffer core?
In-kernel APIs between device drivers and the frame buffer core are not described. Due to a lack of documentation in the original frame buffer API, drivers behaviours differ in subtle (and not so subtle) ways. This document describes the recommended API implementation, but applications should be prepared to deal with different behaviours. 1.
What is the device minor number for the frame buffer?
It’s a character device using major 29; the minor specifies the frame buffer number. By convention, the following device nodes are used (numbers indicate the device minor numbers): 0 = /dev/fb0 First frame buffer 1 = /dev/fb1 Second frame buffer 31 = /dev/fb31 32nd frame buffer
Why do frame buffer drivers behave differently?
Due to a lack of documentation in the original frame buffer API, drivers behaviours differ in subtle (and not so subtle) ways. This document describes the recommended API implementation, but applications should be prepared to deal with different behaviours.