Replicate the wormhole in the bootloader and make it jump to the application if it's open and the enumeration mode is anything but EnumerationMode_Bootloader.

src/bootloader/src/bl_main.c

@@ -44,6 +44,7 @@
 #include "property/property.h"
 #include "utilities/vector_table_info.h"
 #include "utilities/fsl_rtos_abstraction.h"
+#include "bootloader/wormhole.h"
 #if BL_FEATURE_CRC_CHECK
 #include "bootloader/bl_app_crc_check.h"
 #endif
@@ -321,7 +322,7 @@ static peripheral_descriptor_t const *get_active_peripheral(void)
     {
         if (is_direct_boot())
         {
-	        if (RCM->SRS0 & RCM_SRS0_POR_MASK) {
+	        if (RCM->SRS0 & RCM_SRS0_POR_MASK || (IS_WORMHOLE_OPEN && Wormhole.enumerationMode != EnumerationMode_Bootloader)) {
 	        	jump_to_application(applicationAddress, stackPointer);
 	        }
         }

src/bootloader/src/wormhole.c

@@ -0,0 +1,3 @@
+#include "bootloader/wormhole.h"
+
+wormhole_t __attribute__ ((used, section (".noinit"))) Wormhole;

src/bootloader/wormhole.h

@@ -0,0 +1,32 @@
+#ifndef __WORMHOLE_H__
+#define __WORMHOLE_H__
+
+// Includes:
+
+    #include <stdint.h>
+
+// Macros:
+
+    #define WORMHOLE_MAGIC_NUMBER 0x3b04cd9e94521f9a
+    #define IS_WORMHOLE_OPEN (Wormhole.magicNumber == WORMHOLE_MAGIC_NUMBER)
+
+// Typedefs:
+
+    typedef enum {
+        EnumerationMode_Bootloader,
+        EnumerationMode_BusPal,
+        EnumerationMode_NormalKeyboard,
+        EnumerationMode_CompatibleKeyboard,
+    } enumeration_mode_t;
+
+    typedef struct {
+      uint64_t magicNumber;
+      uint8_t enumerationMode;
+      uint16_t timeoutMs;
+    } wormhole_t;
+
+// Variables:
+
+    extern wormhole_t __attribute__ ((section (".noinit"))) Wormhole;
+
+#endif

targets/MK22F51212/kds/freedom_bootloader/.project

@@ -215,6 +215,11 @@
 			<type>2</type>
 			<locationURI>virtual:/virtual</locationURI>
 		</link>
+		<link>
+			<name>src/bootloader/wormhole.h</name>
+			<type>1</type>
+			<locationURI>PARENT-4-PROJECT_LOC/src/bootloader/wormhole.h</locationURI>
+		</link>
 		<link>
 			<name>src/crc/crc16.h</name>
 			<type>1</type>
@@ -445,6 +450,11 @@
 			<type>1</type>
 			<locationURI>PARENT-4-PROJECT_LOC/src/bootloader/src/usb_hid_msc_peripheral_interface.c</locationURI>
 		</link>
+		<link>
+			<name>src/bootloader/src/wormhole.c</name>
+			<type>1</type>
+			<locationURI>PARENT-4-PROJECT_LOC/src/bootloader/src/wormhole.c</locationURI>
+		</link>
 		<link>
 			<name>src/crc/src/crc16.c</name>
 			<type>1</type>

targets/common/linker/kds/MK22F51212/MK22FN512xxx12_application_0x0000.ld

@@ -61,7 +61,8 @@ MEMORY
   m_interrupts          (RX)  : ORIGIN = 0x00000000, LENGTH = 0x00000400
   m_flash_config        (RX)  : ORIGIN = 0x00000400, LENGTH = 0x00000010
   m_text                (RX)  : ORIGIN = 0x00000410, LENGTH = 0x0007FBF0
-  m_data                (RW)  : ORIGIN = 0x1FFF0000, LENGTH = 0x00020000
+  m_data                (RW)  : ORIGIN = 0x1FFF0000, LENGTH = 0x0001FF00
+  m_noinit              (RW)  : ORIGIN = 0x2000FF00, LENGTH = 0x00000100
 }
 
 /* Define output sections */
@@ -255,5 +256,16 @@ SECTIONS
   .ARM.attributes 0 : { *(.ARM.attributes) }
 
   ASSERT(__StackLimit >= __HeapLimit, "region m_data_2 overflowed with stack and heap")
+
+  .noinit (NOLOAD):
+  {
+    . = ALIGN(4);
+    _noinit = .;
+
+    *(.noinit .noinit.*)
+
+    . = ALIGN(4) ;
+    _end_noinit = .;
+  } > m_noinit
 }