At least one users really need this, so be nice and provide it...

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Windows RIS has been reported to make inappropriate use of data found
in uninitialized memory.  To avoid that, clear memory between
a chainloaded boot sector or NBP and Free Base Memory.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

There are apparently TFTP servers in the field which will send OACK
packets with extra NUL bytes appended at the end.  If we find an OACK
packet where the only thing left at some point during processing is
NULs, then just consider the packet processed.

We have reported all TFTP protocol errors as "tsize required", which
is definitely not true anymore.  Change error code to 0 (undefined)
and the error string to "TFTP error".  When this code gets converted
to C we'll do better.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

The command invoked when no keys were pressed for the specified time
(ONTIMEOUT) may be different from the menu item initially selected
when the menu is displayed (DEFAULT or MENU DEFAULT).  Unfortunately,
this did not work together with MENU HIDDEN (which is exactly the case
when having a separate ONTIMEOUT command makes the most sense).

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>