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/*
* Copyright 2017 Toradex AG.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Running this will set GPR9/GPR10 to values which will make the module
* go to recovery mode on next reboot.
* It has the same effect as 'bmode usb noreset' in U-Boot
*
* $ arm-linux-gnueabihf-gcc -o bmode_usb bmode_usb.c
* $ arm-linux-gnueabihf-strip bmode_usb
*/
#include <fcntl.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
/* valid for i.MX6DL/i.MX6Q */
#define SRC_BASE_ADDR 0x020D8000
#define SRC_GPR9_OFF (0x40/4)
#define SRC_GPR10_OFF (0x44/4)
int main(void)
{
int fd;
unsigned reg;
unsigned *src;
fd = open("/dev/mem", O_RDWR);
src = (unsigned *)mmap(0, SRC_GPR10_OFF + 4, PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0x020D8000);
if(src == NULL) {
printf("Failed to mmap register\n");
return -1;
}
src[SRC_GPR9_OFF] = 0x10;
src[SRC_GPR10_OFF] |= 0x10000000;
printf("Next reboot (not powercycle!) will boot to recovery mode\n");
return 0;
}
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