/**
* Put tty into raw mode to mimic serial console better
+ *
+ * @param fd File descriptor of stdin (normally 0)
+ * @param allow_sigs Allow Ctrl-C, Ctrl-Z to generate signals rather than
+ * be handled by U-Boot
*/
-void os_tty_raw(int fd);
+void os_tty_raw(int fd, bool allow_sigs);
/**
* Acquires some memory from the underlying os.