xvesa vs xfbdev

[neonix]

In TCL Xvesa and Xfbdev are almost the same, becouse in IBM PC computers in Linux kernel use vesafb if you don't have GPU supported bu dedicated driverr in Linux kerner or Xorg, Wayland (userland).

I don't know if shadow framebufer is suportedd by vesafb kernel driver.

I had laptop that don't have GPU, and display was unaccelerated real framebuffer.
https://en.wikipedia.org/wiki/Skytone_Alpha-400

I have question. How does Xvesa works? CPU is drowing a screen image with floating-point or fixed-point? Is it use one core or many CPU cores?
 

[gadget42]

tl;dr: this is why we can't have nice things...sigh...

after visiting the Skytone Alpha 400 wikipedia link i followed a link found there to this one:

https://en.wikipedia.org/wiki/Ingenic_Semiconductor
(and more specifically to this sub-heading/section: https://en.wikipedia.org/wiki/Ingenic_Semiconductor#XBurst_microarchitecture)

which notes that the JZ4730 in the Skytone Alpha 400 is the least-capable/functionable of those units[frowning-face-emoji]

A RISC/SIMD/DSP hybrid instruction set architecture which enables the processor to have the capability of computation, signal processing and video processing. This includes the Media Extension Unit (MXU), a 32-bit SIMD extension. All JZ47xx series CPUs with Xburst uA support MXU, except for the JZ4730.

other links which may or may-not help:
https://www.xfree86.org/current/Xvesa.1.html
https://www.xfree86.org/current/TinyX.1.html
https://www.xfree86.org/current/Xserver.1.html
https://www.xfree86.org/current/XFree86.1.html

additional background:
https://en.wikipedia.org/wiki/Open_Software_Foundation
https://en.wikipedia.org/wiki/The_Open_Group
https://en.wikipedia.org/wiki/X.Org_Foundation

deeper:
https://en.wikipedia.org/wiki/Xvesa
https://gitlab.freedesktop.org/xorg/xserver
https://x.org/wiki/

more entertainment:
https://www.damnsmalllinux.org/wiki/x.html
https://www.slitaz.org/en/doc/scratchbook/x-window-system.html
https://stackoverflow.com/questions/3692738/floating-point-versus-fixed-point-what-are-the-pros-cons

posted mostly for future visitors arriving here after a search for the Skytone Alpha 400