main.c File Reference

CPU0 (M85) Secure world bootloader/fallback for the e-reader. More...

#include <stdint.h>
#include "ra8_boot_entry.h"

Include dependency graph for main.c:

Go to the source code of this file.

Functions
void	main (void)
	Secure fallback main entry point.

Variables
volatile uint32_t	g_ra8_secure_fallback_count = 0U
	Diagnostic counter incremented if Secure fallback main is reached.

Detailed Description

CPU0 (M85) Secure world bootloader/fallback for the e-reader.

Tag

[Ring 6 / APP] {World: S}

On normal execution, this function is not reached. SystemInit calls ra8_trustzone_init, which configures the SAU regions and transitions the CPU to the Non-Secure world to run the actual e-reader firmware.

If the transition fails or is bypassed (e.g. on off-target builds), main() runs as a fallback, increments a diagnostic counter, and parks the CPU safely.

Copyright

Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Since

0.1.0

Definition in file main.c.

Function Documentation

main()

void main

(

void

)

Secure fallback main entry point.

The application entry point Reset_Handler hands control to.

Since

0.1.0

Definition at line 37 of file main.c.

References g_ra8_secure_fallback_count, internal_audio_loopback_init_clocks_and_led(), internal_audio_loopback_init_codec(), internal_audio_loopback_init_console(), internal_audio_loopback_panic_halt(), internal_audio_loopback_print_count(), k_audio_loopback_block_samples, k_audio_loopback_print_period, k_ra8_board_led1, k_ra8_ok, ra8_board_audio_play_sample_block(), ra8_board_led_toggle(), ra8_isr_globals_enable(), and s_audio_loopback_silence.

Referenced by Reset_Handler().

Variable Documentation

g_ra8_secure_fallback_count

volatile uint32_t g_ra8_secure_fallback_count = 0U

Diagnostic counter incremented if Secure fallback main is reached.

Since

0.1.0

Definition at line 31 of file main.c.

Referenced by main().