please note that hopefully not so many people can “rotate Linaro” Linaro is a company , which among many things provides the builds for the Dragonboard. Linaro is not a Distro, neither.
So , I assume you want to know how to rotate the screen when installing one of the Debian builds that we release. By default, our builds use Xorg , so assuming you are using the default config, then you can rotation the desktop in Xorg using the following commands:
xrandr --output HDMI-1 --rotate left
xrandr --output HDMI-1 --rotate right
xrandr --output HDMI-1 --rotate normal
xrandr --output HDMI-1 --rotate inverted
Note that HDMI-1 is the name of your monitor, to double check what is being used in your case, you can run the xrandr command with no arg, and inspect its output.