This is RUI3 SDK inside RUI_3.6.0b_183 release.

LICENSE.txt

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+Copyright 2022 Shenzhen RAKwireless Technology Co., Ltd.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+
+4. This software, with or without modification, must only be used with a RAKwireless product.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cores/apollo3/app/app_glue.cpp

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+extern void setup();
+extern void loop();
+
+extern "C" void rui_setup()
+{
+  setup();
+}
+
+extern "C" void rui_loop()
+{
+  loop();
+}

cores/apollo3/component/core/mcu/apollo3/flash_apollo3.ld

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+
+/******************************************************************************
+ *
+ * flash.ld - Linker script for applications using startup_gcc.c
+ *
+ *****************************************************************************/
+ENTRY(Reset_Handler)
+BOOT_VERSION = 0x000F6000;
+
+MEMORY
+{
+    ROMEM (rx) : ORIGIN = 0x00010000, LENGTH = 976K
+    RWMEM (rwx) : ORIGIN = 0x10000000, LENGTH = 384K
+}
+
+SECTIONS
+{
+    .text :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector))
+        KEEP(*(.patch))
+        *(.text)
+        *(.text*)
+
+        . = ALIGN(4);  
+        __init_array_start = .;
+        KEEP(*(.init_array))        /* C++ constructors */ 
+        KEEP(*(.ctors))             /* and vtable init */
+        __init_array_end = .; 
+
+        *(.rodata)
+        *(.rodata*)
+        . = ALIGN(4);
+        _etext = .;
+    } > ROMEM
+
+    /* User stack section initialized by startup code. */
+    .stack (NOLOAD):
+    {
+        . = ALIGN(8);
+        *(.stack)
+        *(.stack*)
+        . = ALIGN(8);
+    } > RWMEM
+
+    .atcmd_queue :
+    {
+        PROVIDE(__start_atcmd_queue = .);
+        KEEP(*(.atcmd_queue))
+        PROVIDE(__stop_atcmd_queue = .);
+    } > RWMEM
+
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;
+        *(.data)
+        *(.data*)
+        . = ALIGN(4);
+        _edata = .;
+    } > RWMEM AT>ROMEM
+
+    /* used by startup to initialize data */
+    _init_data = LOADADDR(.data);
+
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;
+        *(.bss)
+        *(.bss*)
+        *(COMMON)
+        . = ALIGN(4);
+        _ebss = .;
+    } > RWMEM
+
+    .heap (COPY):
+	{
+		__end__ = .;
+		PROVIDE(end = .);
+		*(.heap*)
+		__HeapLimit = .;
+	} > RWMEM
+
+    .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } > RWMEM
+    .ARM : {
+        __exidx_start = .;
+        *(.ARM.exidx*)
+        __exidx_end = .;
+    } > RWMEM    
+
+    /* remove the debugging information from the standard libraries */
+    /DISCARD/ :
+    {
+     libc.a ( * )
+     libm.a ( * )
+     libgcc.a ( * )
+    }
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}

cores/apollo3/component/core/mcu/apollo3/mcu_basic.h

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+#ifndef __MCU_BASIC_H__
+#define __MCU_BASIC_H__
+
+#define MCU_SYS_CONFIG_NVM_ADDR           0x000FA000
+#define MCU_USER_DATA_NVM_ADDR            0x000FC000
+#define MCU_FACTORY_DEFAULT_NVM_ADDR      0x000FE000
+
+#endif