Is there a 768x1024 framebuffer "VERTICAL" mode?

Hello,

For all my Debian's computers, I usualy configure my consoles with the
vga=791 (VESA framebuffer console @ 1024x768x64k).  It works very well.

Now, I'm working on a digital kiosk project with Linux embeded, but my
screens are all mounted verticaly (it's a kind of photomaton with only a
portrait mode).

For the support of our solution, it's very hard to type console commands
having the neck broken during hours. :(

Is there a 768x1024 (for a screen mounted verticaly!) framebuffer mode?
And, more generaly, is there a way to set all modes in a vertical way?
What can be the consequences with X?

Thanks,
-- 
Jean-Martial.

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