Adding "serial 0 9600" made it "usable", but I also had to remove color/layout configuration (stdmenu.cfg) to show complete menu.
As vesamenu.c32 switches display mode to graphical mode, it'd be better to use menu.c32 (which only uses text mode). However, you will loose all goodies like splash screen. I think it'd be better to have alternative theme for serial console (and other less-featured device). How about adding "debian-simple" theme? As a starter, I have attached "debian-simple" theme patch in this email. Anyone who don't like fancy stuff can - Change /usr/share/syslinux/themes/debian symlink - Edit EXTLINUX_THEME entry in /etc/default/extlinux to use it. Best Regards,
0001-Added-debian-simple-theme.patch
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0002-Added-debian-control-files-for-debian-simple-theme.patch
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