On Fri, 30 Apr 2021 08:22:10 -0700 (PDT), in
gmane.comp.hardware.beagleboard.user Walter Cromer
<walterc-2dFtBuzUeF/[email protected]> wrote:
>I checked with ls -ls /dev/mem logged in as debian and it's there.
>
debian@beaglebone:~$ ls -ls /dev/mem
0 crw-r----- 1 root kmem 1, 1 Apr 30 12:06 /dev/mem
debian@beaglebone:~$
debian@beaglebone:~$ groups
debian adm kmem dialout cdrom floppy audio dip video plugdev users
systemd-journal input bluetooth netdev i2c remoteproc eqep pwm cloud9ide
xenomai weston-launch tisdk docker iio spi admin gpio
debian@beaglebone:~$
That is what my BBB shows.
Owner (root) has R/W permission
Group (kmem) has Read-Only permission.
The debian account has kmem group access.
From your earlier post...
> fd = open ("/dev/mem", O_RDWR | O_SYNC);
... you are asking for R/W access -- which is not set for members of the
kmem group. What happens if you attempt to open /dev/mem for read-only
access?
--
Dennis L Bieber
--
For more options, visit http://beagleboard.org/discuss
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