We only need the first few keymaps corresponding to the following constants:

K_NORMTAB, K_SHIFTTAB, K_ALTTAB, K_ALTSHIFTTAB

In the normal case we'll load all the keymaps from the kernel, but this reduces the size of the SDL library for the fallback case when we can't get to the tty.

src/core/linux/SDL_evdev_kbd_default_keymap.h

@@ -155,6 +155,7 @@ static unsigned short default_key_map_3[NR_KEYS] = {
     0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 
     0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 
 };
+#ifdef INCLUDE_EXTENDED_KEYMAP
 static unsigned short default_key_map_4[NR_KEYS] = {
     0xf200, 0xf01b, 0xf200, 0xf000, 0xf200, 0xf200, 0xf200, 0xf01e, 
     0xf200, 0xf200, 0xf200, 0xf200, 0xf01f, 0xf200, 0xf008, 0xf009, 
@@ -4371,12 +4372,14 @@ static unsigned short default_key_map_127[NR_KEYS] = {
     0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 
     0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 
 };
+#endif /* INCLUDE_EXTENDED_KEYMAP */
 
 static unsigned short *default_key_maps[MAX_NR_KEYMAPS] = {
     default_key_map_0,
     default_key_map_1,
     default_key_map_2,
     default_key_map_3,
+#ifdef INCLUDE_EXTENDED_KEYMAP
     default_key_map_4,
     default_key_map_5,
     default_key_map_6,
@@ -4501,6 +4504,132 @@ static unsigned short *default_key_maps[MAX_NR_KEYMAPS] = {
     default_key_map_125,
     default_key_map_126,
     default_key_map_127,
+#else /* !INCLUDE_EXTENDED_KEYMAP */
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+#endif /* INCLUDE_EXTENDED_KEYMAP */
     NULL,
     NULL,
     NULL,