When running with video enabled, the pre-relocation output of U-Boot is
currently lost. Add a -serial flag to show it on the terminal.
Signed-off-by: Simon Glass <sjg@chromium.org>
It is quite complicated to run U-Boot on QEMU since we have four
different builds and they must use different versions of qemu and the
UEFI binaries.
Add a script to help. It requires U-Boot itself to be built. Once that
is done you can use this script to build an image for use with qemu and
optionally run it.
Signed-off-by: Simon Glass <sjg@chromium.org>