UPDATE 16th Aug

• Compiled C binary which includes "C include file style bmp" files, shows [ 387 fps ] minimal rate. memcpy() used. (Omega2+)
• Compiled C binary, memcpy() fill_screen one color 1000 times -> [ 432 fps ]
• Compiled C binary, memcpy() fill_screen 21 color 1000 times -> [ 439 fps ]

fill screen function, after first line just memcpy()

void
	fillScreen ( struct fb_info *fb_info, unsigned int color )
	{
		//~ for ( int i=0; i <= fb_info -> screensize; i++ )
			//~ putPixelDirectToLocation( fb_info, i, color );

		for ( int i=0; i < fb_info -> var.xres; i++ )
		{
			putPixel( fb_info, i, 0, color );
		}
		
		for ( int i=1; i < fb_info -> var.yres; i++ )
		{
			memcpy( fb_info -> ptr + ( fb_info -> fix.line_length * i ),
					fb_info -> ptr,
					( fb_info -> var.xres * ( fb_info -> var.bits_per_pixel / 8 ) ) );
		}

		/***********/
		//~ for ( int i = 0; i < fb_info -> var.yres; i++)
		//~ {
			//~ drawHorizontalLine ( fb_info, 0, i, (unsigned int)fb_info -> var.xres, color );
		//~ }
	}

this is the embedded bmp push code

	for (int i=0; i<1000; i++)
	{
		/* memcpy() bmp show */
		memcpy( fb_info.ptr, &logo_bmp[0], logo_bmp_len );
	}

and this is the simple test code

date nanoseconds enabled from menuconfig "%N" and bc installed

#!/usr/bin/env sh

count=1000
first=$(date +"%s.%N")
echo -e "started\t"$first
#for i in `seq $count`; do ./fb-test; done;
./fb-test
last=$(date +"%s.%N")
echo -e "ended\t"$last
echo $(echo "$count/($last-$first)" | bc)" fps"

Last one the built in debug, i think it has some kind of bug or it is not an optimized code ( ~3000Kb * ~5 = ~15.000 Kb ) i think this is the equation:

when you use debug=$((1<<5)) it shows, (~ 3000Kb) * ( ~5 )
or
echo -e $((1<<5)) > /sys/class/graphics/fb0/debug
then, for cancle
echo -e 0 > /sys/class/graphics/fb0/debug

Extras

I wrote something similar Adafruit_GFX, it capable of draw lines, draw triangles, draw squares, draw circles, push 16bit bmps ... but the code has a lots of issue, there is a long way to go for stable. When i clean things up I will push the code to gitlab.

if you compile modules builtin, below script activates the display in 10 seconds or so when power up the omega2, i am trying to activate with uboot but no luck for now.

display init script init.d

#!/bin/sh /etc/rc.common

START=01
STOP=99

DEFAULT_ROTATION=3
ROTATE_ANGLE=270

EXTRA_COMMANDS="rotate"
EXTRA_HELP="
        rotate Change the display direction to one of the [0 1 2 3] values 0:0, 1:90, 2:180, 3:270
"

start() {
        insmod fbtft_device custom name="fb_ili9341" busnum=32766 cs=1 speed=96666000 mode=3 fps=100 txbuflen=3145728 buswidth=8 bgr=1 gpios=reset:2,dc:3 width=240 height=320 verbose=0 rotate=$ROTATE_ANGLE debug=0
}

stop() {
        rmmod fbtft_device
}

rotate() {
        if [ ! -z $1 ]; then
        stop
                if [ $1 -eq 0 ]; then
                        ROTATE_ANGLE=0
                        echo "$1 0"
                elif [ $1 -eq 1 ]; then
                        ROTATE_ANGLE=90
                        echo "$1 90"
                elif [ $1 -eq 2 ]; then
                        ROTATE_ANGLE=180
                        echo "$1 180"
                elif [ $1 -eq 3 ]; then
                        ROTATE_ANGLE=270
                        echo "$1 270"
                else
                        ROTATE_ANGLE=270
                        echo "$1 270"
                fi
        start
        fi
}

boot() {
        start
}