blob: 3ac6ddcab79e24677123b3729e149325ca774e1d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/*
* 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>
#ifdef MX6
#define SRC_BASE_ADDR 0x020D8000
#define SRC_GPR9_OFF (0x40/4)
#define SRC_GPR10_OFF (0x44/4)
#define SRC_GPR9_OFF_VALUE 0x10
#define SRC_GPR10_OFF_VALUE 0x10000000
#elif defined(MX6ULL)
#define SRC_BASE_ADDR 0x020D8000
#define SRC_GPR9_OFF (0x40/4)
#define SRC_GPR10_OFF (0x44/4)
#define SRC_GPR9_OFF_VALUE 0x20
#define SRC_GPR10_OFF_VALUE 0x10000000
#endif
int main(void)
{
#if ( defined(MX6) | defined(MX6ULL) )
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, SRC_BASE_ADDR);
if(src == NULL) {
printf("Failed to mmap register\n");
return -1;
}
src[SRC_GPR9_OFF] = SRC_GPR9_OFF_VALUE;
src[SRC_GPR10_OFF] |= SRC_GPR10_OFF_VALUE;
printf("Next reboot (not powercycle!) will boot to recovery mode\n");
#else
printf("Not supported on this platform\n");
#endif
return 0;
}
|
