devmem2 not working.I have installed devmem2 in my development board to read the peripheral registers however the command is not working /dev/mem opened however it is showing Error at line 75, file devmem2.c (1) [Operation not permitted]

KS.2 · ‎2021-08-01

OlivierK · ‎2021-08-04

The latest is V3.0

https://www.st.com/en/embedded-software/stm32mp1dev.html#overview&secondary=st-get-software

View solution in original post

OlivierK · ‎2021-08-02

Hello KS.2 (Community Member)

Have you tried https://wiki.st.com/stm32mpu/wiki/How_to_read_or_write_peripheral_registers

KS.2 · ‎2021-08-02

Hi OliverK

yes i followed the same link and installed the devmem2 starter package.

I tried the baudrate command and led command and receieved the error.

dev/mem opened

Error at line 75, file devmem2.c (1) [Operation not permitted]

This is the error message

OlivierK · ‎2021-08-02

Hi KS.2 (Community Member)

I've just installed devmem2 it via the starter package and tried the command, no issue to be reported.

Are you using the latest starter package image (V3.0.x)?

root@stm32mp1:~# apt-get update

The software package is provided AS IS, and by downloading it, you agree to be

bound to the terms of the software license agreement (SLA).

The detailed content licenses can be found at

https://wiki.st.com/stm32mpu/wiki/OpenSTLinux_licenses.

Get:1 http://packages.openstlinux.st.com/3.0 dunfell InRelease [3458 B]

Get:2 http://packages.openstlinux.st.com/3.0 dunfell/main armhf Packages [1005 ]

Get:3 http://packages.openstlinux.st.com/3.0 dunfell/updates armhf Packages [29]

Get:4 http://packages.openstlinux.st.com/3.0 dunfell/untested armhf Packages [1]

Fetched 2477 kB in 4s (554 kB/s)

Reading package lists... Done

root@stm32mp1:~# apt-get install devmem2

Reading package lists... Done

Building dependency tree... Done

The following NEW packages will be installed:

devmem2

0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.

Need to get 2984 B of archives.

After this operation, 0 B of additional disk space will be used.

Get:1 http://packages.openstlinux.st.com/3.0 dunfell/untested armhf devmem2 arm]

Fetched 2984 B in 0s (3572 B/s)

The software package is provided AS IS, and by downloading it, you agree to be

bound to the terms of the software license agreement (SLA).

The detailed content licenses can be found at

https://wiki.st.com/stm32mpu/wiki/OpenSTLinux_licenses.

Selecting previously unselected package devmem2.

(Reading database ... 14610 files and directories currently installed.)

Preparing to unpack .../devmem2_1.0-r7_armhf.deb ...

Unpacking devmem2 (1.0-r7) ...

Setting up devmem2 (1.0-r7) ...

root@stm32mp1:~# devmem2 0x4001000C

/dev/mem opened.

Memory mapped at address 0xb6feb000.

Read at address 0x4001000C (0xb6feb00c): 0x0000022C

root@stm32mp1:~#

KS.2 · ‎2021-08-03

root@stm32mp1:~# apt-get update

The software package is provided AS IS, and by downloading it, you agree to be bound to the terms of the software license agreement (SLA).

The detailed content licenses can be found at https://wiki.st.com/stm32mpu/wiki/OpenSTLinux_licenses.

Err:1 http://packages.openstlinux.st.com/2.0 dunfell InRelease

Temporary failure resolving 'packages.openstlinux.st.com'

Reading package lists... Done

W: Failed to fetch http://packages.openstlinux.st.com/2.0/dists/dunfell/InRelease Temporary failure resolving 'packages.openstlinux.st.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.

i am getting this error while trying to update,how to resolve this seems like a dnss issue

KS.2 · ‎2021-08-03

root@stm32mp1:/etc# cat resolv.conf

# This file is managed by man:systemd-resolved(8). Do not edit.

#

# This is a dynamic resolv.conf file for connecting local clients directly to

# all known uplink DNS servers. This file lists all configured search domains.

#

# Third party programs must not access this file directly, but only through the

# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,

# replace this symlink by a static file or a different symlink.

#

# See man:systemd-resolved.service(8) for details about the supported modes of

# operation for /etc/resolv.conf.

nameserver 1.1.1.1

nameserver 8.8.8.8

nameserver 1.0.0.1

# Too many DNS servers configured, the following entries may be ignored.

nameserver 8.8.4.4

nameserver 2606:4700:4700::1111

nameserver 2001:4860:4860::8888

nameserver 2606:4700:4700::1001

nameserver 2001:4860:4860::8844

i think this is the reason as all the entries are being ignored

however i am unable to edit the resolv.conf file

is there any way usual editors are not working(nano,vim,gedit..

)

OlivierK · ‎2021-08-03

It looks like you are not using the latest openstlinux packages, are you sure you currently use a V3.0 starter image?

In /etc/apt/sources.list.d#, you should point to a debian package V3.0 (not V2.x)

There is vi that come as std to edit. Others need to be installed.

KS.2 · ‎2021-08-03

The resolv.conf is the issue i guess

nameserver 1.1.1.1

nameserver 8.8.8.8

nameserver 1.0.0.1

# Too many DNS servers configured, the following entries may be ignored.

nameserver 8.8.4.4

nameserver 2606:4700:4700::1111

nameserver 2001:4860:4860::8888

nameserver 2606:4700:4700::1001

nameserver 2001:4860:4860::8844

since all the servers are being ignored the dnss is not working

is there a way to edit the resolve.conf permanently

i tried overwriting using cat but it keeps changing once i reset the board.

KS.2 · ‎2021-08-03

yea we r using v2.0

OlivierK · ‎2021-08-03

You can also refer to this article for manual setup: https://wiki.st.com/stm32mpu/wiki/Package_repository_for_OpenSTLinux_distribution#Prequisite