diff --git a/components/lwp/terminal/freebsd/tty_compat.c b/components/lwp/terminal/freebsd/tty_compat.c
index 08ff49f8017e..338489d54905 100644
--- a/components/lwp/terminal/freebsd/tty_compat.c
+++ b/components/lwp/terminal/freebsd/tty_compat.c
@@ -547,9 +547,20 @@ int lwp_tty_ioctl_adapter(lwp_tty_t tp, int cmd, int oflags, void *args, rt_thre
             error = (IOCTL(FIONREAD, args, fflags, td));
             break;
 
-#ifdef USING_BSD_IOCTL_EXT
-            /* TIOCLINUX */
+        case TIOCLINUX:
+        {
+            /*
+             * Linux uses TIOCLINUX to obtain console keyboard modifier
+             * state.  RT-Thread serial consoles do not expose that state,
+             * but applications such as mc only need this ioctl to be
+             * harmless when it is unavailable.
+             */
+            unsigned char modifiers = 0;
+            error = _copy_to_user(args, &modifiers, sizeof(modifiers));
+            break;
+        }
 
+#ifdef USING_BSD_IOCTL_EXT
         case TIOCCONS:
             args->cmd = TIOCCONS;
             error = (sys_ioctl(td, (struct ioctl_args *)args));
diff --git a/components/lwp/terminal/tty_device.c b/components/lwp/terminal/tty_device.c
index 17364fabc108..a2936a0d1b51 100644
--- a/components/lwp/terminal/tty_device.c
+++ b/components/lwp/terminal/tty_device.c
@@ -347,8 +347,11 @@ static void tty_init_termios(lwp_tty_t tp)
     t->__c_ispeed = TTYDEF_SPEED;
     t->__c_ospeed = TTYDEF_SPEED;
 
-    memcpy(&t->c_cc, tty_ctrl_charset,
-           sizeof(tty_ctrl_charset) / sizeof(tty_ctrl_charset[0]));
+    /* Keep terminal consumers usable when the host cannot report a size. */
+    tp->t_winsize.ws_row = 24;
+    tp->t_winsize.ws_col = 80;
+
+    memcpy(&t->c_cc, tty_ctrl_charset, sizeof(tty_ctrl_charset));
 
 #ifdef USING_BSD_INIT_LOCK_DEVICE
     tp->t_termios_init_out = *t;