Add an 'efidebug filename' command to report the default filename and
PXE architecture.

Signed-off-by: Simon Glass <sjg@chromium.org>

Record the last active menu item and check if it equals to the
current selected item before reprint.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>

This patch adds a new callback named need_reprint for menu.
The need_reprint will be called before printing the menu. If the
callback exists and returns FALSE, menu printing will be canceled.

This is very useful if the menu was not changed. It can save time
for serial-based menu to handle more input data.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>

This is mostly hidden in the background, but it is sometimes useful to
look at it. Add a function to allow this.

Signed-off-by: Simon Glass <sjg@chromium.org>

Ise the new U_BOOT_CMD_WITH_SUBCMDS() macro instead of writing the code
out manually.

Signed-off-by: Simon Glass <sjg@chromium.org>

Coreboot provides the CMOS layout in the tables it passes to U-Boot.
Use that to build an editor for the CMOS settings.

Signed-off-by: Simon Glass <sjg@chromium.org>

Coreboot tables provide information about the CMOS-RAM checksum. Add a
command which can check and update this.

With this it is possible to adjust CMOS-RAM settings and tidy up the
checksum afterwards.

Signed-off-by: Simon Glass <sjg@chromium.org>

Update the cbsysinfo command to show the contents of the CMOS option
table.

While we are here, add some example output for this command, along with
mention of what the unimplemented tags are.

Signed-off-by: Simon Glass <sjg@chromium.org>

When the buffer address is not set, say so, rather than showing an
address which looks very strange, on sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>

This should really use an address rather than the buffer. Update it in
the command.

Signed-off-by: Simon Glass <sjg@chromium.org>