Can't correctly set palette

Hello,
    I am trying to create a graphical RedHat Linux bootup using Frame Buffer
pixmap drawing (with the help of bogl library with bogl_put function). After
successfully display the image from the command prompt. I try to add my
image-drawing command to rc script, however, the image appeared to use wrong
palette, all color are distorted. It seems that if I am trying to display
the image in the different VT than the Vt that is running the program, the
color palette will always distort (using chvt xx && ./show_image). I try to
get the frame buffer palette using ioctl(FBIOGETCMAP) but it alwasy return
zero fb_cmap. What have I done wrong? Here are the details of my platform

frame buffer driver: vesafb (passing vga=0x301 at boot time)
image: 640x480 - 7 bit indexed color.

I also try libfbx and result is the same.

PS: Don't tell me to use default color palette. I need to display a nice 7
bit image in console mode.

------------------------------------------------------------------------
Somsak Sriprayoonsakul

High Performance Computing and Networking Center
Kasetsart University
ssy@hpcnc.cpe.ku.ac.th
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