Michael Brown
7054468d56
[shell] Enable "shell" command even when BANNER_TIMEOUT is zero
Setting BANNER_TIMEOUT to zero removes the only symbol reference to
shell.o, causing the "shell" command to become unavailable.
Add SHELL_CMD in config/general.h (enabled by default) which will
explicitly drag in shell.o regardless of the value of BANNER_TIMEOUT.
Reported-by: Julian Brost <julian@0x4a42.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>