"Permission denied" as an error text to strerror().

anything over 0x80 is an extended character.

curses.h so that you don't have to suffer the curses namespace pollution
just to get the symbolic key names.

causing the serial console to ignore input, because it happened to end up
linked with serial_ischar() at address 0, which core/console.c decided was
invalid).

Kill errortab array; it can screw up alignment.

"boot" command to attempt booting from within the command shell, fall back
to shell if boot fails for any reason.

screen sequence doesn't work (like bios_console.c on some platforms).

the option config UI.

Introduce new {show,set,clear}_setting() that take a struct setting *
rather than a const char *.

set_setting() handles calling clear_setting() when appropriate, so that
individual setting types don't have to check for empty strings.

memory" and "no space left for DHCP options"