Hi Wolfram,
On Wed, Dec 22, 2021 at 1:58 PM Wolfram Sang
<wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote:
> > > Yes, the search engines helped[1]. I run a minimal system, so when I
> > > mount cpusets, it will actually mount cgroups with a default mount
> > > option of "noprefix". But you likely run a rootfs with cgroups already,
> > > so it gets mounted directly without "noprefix". Then, when the logic
> > > analyzer tries to mount again, the implied default "noprefix" is
> > > discarded.
> >
> > Yeah, systemd on Debian has it mounted.
>
> So, the proper solution is to use/mount 'cgroups2' instead of 'cpuset'.
> But this needs more thinking and testing and, thus, another revision.
> Dunno if I can make it this year, so I am probably going to miss the
> next merge window after all :(
>
> Geert, if you still want to test the PFC patch I sent, then this patch
> for the script should get you going:
Thank you, much better!
With this I get:
1# gpio-sloppy-logic-analyzer -s 1500000 -t 1H+2F -d 15000
Auto-Isolating CPU1
Setting up 'i2c2-analyzer': 22500 samples at 1500000Hz with 1H+2F
trigger using CPU1
1# echo: write error: Numerical result out of range
Capture error! Check kernel log
kernel log has:
gpio-sloppy-logic-analyzer i2c2-analyzer: couldn't read GPIOs: -34
with debug code:
priv->delay_ns = 666
priv->acq_delay = 2342
Whoops, R-Car M2-W GPIO is too slow (clocked at 10 MHz, compared to 66
MHz on R-Car H3 ES2.0)?
Retry with slower speed, until it works:
1# gpio-sloppy-logic-analyzer -s 300000 -t 1H+2F -d 15000
Setting up 'i2c2-analyzer': 4500 samples at 300000Hz with 1H+2F
trigger using CPU1
2# i2cdetect -y 2
1# cp: cannot stat
'/sys/kernel/debug/gpio-sloppy-logic-analyzer/i2c2-analyzer/sample_data':
No such file or directory
And the sample_data file is indeed missing.
After reboot, everything works fine, and I can no longer reproduce the
missing file issue above, even when repeating the same steps.
The resulting data file can be viewed with pulseview, and I can see SCL
and SDA activity. Nice!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
