| /* |
| * Copyright (c) 2025 Renesas Electronics Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/devicetree.h> |
| #include <zephyr/linker/sections.h> |
| |
| /* Require CONFIG_XIP=n */ |
| #define ROM_START (CONFIG_FLASH_BASE_ADDRESS + DT_REG_ADDR(DT_CHOSEN(zephyr_code_partition))) |
| #define RAM_START CONFIG_SRAM_BASE_ADDRESS |
| #define APP_SIZE _flash_used |
| |
| _ASM_FILE_PROLOGUE |
| |
| GTEXT(loader_program) |
| |
| /* |
| * Loader program |
| */ |
| SECTION_FUNC(loader_text, loader_program) |
| ldr r0, =ROM_START // Src in ROM |
| ldr r1, =RAM_START // Des in RAM |
| ldr r2, =APP_SIZE |
| |
| cmp r2, #0 |
| beq exit |
| |
| loop: |
| ldrb r3, [r0], #1 // Load byte from src and increment src pointer |
| strb r3, [r1], #1 // Store byte to des and increment des pointer |
| subs r2, r2, #1 // Decrement size and updates the condition flags |
| bne loop // If size is not 0, repeat loop |
| |
| done: |
| dsb sy |
| ldr pc, =__start |
| |
| exit: |
| wfi |
