mirror of https://github.com/wolfSSL/wolfBoot.git
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/* app_cm4.c
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*
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* Test application for Raspberry Pi CM4 (BCM2711). Prints a banner over the
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* mini-UART (the console wired to GPIO14/15; build with CM4_UART_PL011 to use
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* the PL011 instead) and halts. wolfBoot's FIPS power-on self-test and in-core
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* integrity check run in the bootloader (src/loader.c), not in the app.
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*
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* Copyright (C) 2026 wolfSSL Inc.
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*
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* This file is part of wolfBoot.
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*
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* wolfBoot is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* wolfBoot is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#include <stdint.h>
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#include "wolfboot/wolfboot.h"
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#include "hal/cm4.h" /* BCM2711 UART register map */
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#ifdef TARGET_cm4
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#if defined(CM4_UART_PL011)
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static void uart_init(void)
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{
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/* Route GPIO14 (TXD0) and GPIO15 (RXD0) to the PL011 via ALT0, so the app's
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* console reaches the 40-pin debug header (matching hal/cm4.c uart_init()).
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* Without this the PL011 stays wired to the Bluetooth pins and the app is
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* silent. GPFSEL1 (GPIO_BASE+0x04) holds FSEL10-19: ALT0 = 0b100. */
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volatile unsigned int *gpfsel1 =
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(volatile unsigned int *)(BCM2711_GPIO_BASE + 0x04);
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unsigned int fsel;
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fsel = *gpfsel1;
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fsel &= ~((7u << 12) | (7u << 15));
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fsel |= ((4u << 12) | (4u << 15));
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*gpfsel1 = fsel;
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/* PL011 for 115200 8N1 from the 48 MHz UART clock (see hal/cm4.c) */
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*UART0_CR = 0;
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*UART0_ICR = 0x7FF;
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*UART0_IBRD = 26;
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*UART0_FBRD = 3;
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*UART0_LCRH = (1 << 4) | (1 << 5) | (1 << 6);
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*UART0_CR = (1 << 0) | (1 << 8) | (1 << 9);
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}
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static void uart_putc(char c)
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{
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while (*UART0_FR & 0x20) /* wait while TX FIFO full */
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;
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*UART0_DR = (unsigned int)(unsigned char)c;
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}
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#else /* mini-UART (default) - inherit the firmware's enabled console */
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static void uart_init(void)
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{
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/* The firmware leaves the mini-UART enabled at a stable baud; wolfBoot ran
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* on it too. Nothing to program - just write AUX_MU_IO. */
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}
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static void uart_putc(char c)
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{
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while ((*MU_LSR & MU_LSR_TXFF_EMPTY) == 0) /* wait until TX can accept */
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;
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*MU_IO = (unsigned int)(unsigned char)c;
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}
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#endif /* CM4_UART_PL011 */
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static void uart_puts(const char* s)
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{
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while (*s) {
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if (*s == '\n')
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uart_putc('\r');
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uart_putc(*s++);
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}
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}
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void main(void)
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{
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uart_init();
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uart_puts("\n=== wolfBoot CM4 test-app ===\n");
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uart_puts("test-app done; halting.\n");
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while (1)
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;
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}
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#endif /* TARGET_cm4 */
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