I can suppress GRUB output with terminal_output. By default terminal_output is set to "vga_text" and could be set to any of: gfxterm, spkmodem, serial, mda_text, cbmemc, audio, vga_text - only cbmemc and vga_text work.
If I set the terminal_output to cbmemc I can execute any command and return to default grub output (by blindly setting terminal_output back to "vga_text"). At this point I can't boot Linux - GRUB restarts (execute blindly boot after I set root, linux and initrd) ++ and there appears to be an overflow problem in GRUB command line when having set vga_text output. Any suggestions would be welcomed. Thank you, Grigore
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