[PD] Pd on Tiny Core Linux on Raspberry Pi

Peter P. peterparker at fastmail.com
Wed Jul 11 12:31:33 CEST 2018


* Chris McCormick <chris at mccormick.cx> [2018-07-11 10:41]:
> Hi,
> On 11/07/18 04:13, Peter P. wrote:
> > Furthermore, does anyone know if the 'tc' user can be added to an
> > audiogroup, whose permissions could be elevated through
> > /etc/security/limits.conf (currently not present in piCore).
> I think you could do this by settings the rtprio limit directly in:
> /opt/bootscript.sh
> It seems that sysctl and ulimit can't set this but maybe this will help:
> https://serverfault.com/questions/889635/seting-rtprio-limit-in-system-without-pam
Thanks for that link! In this case I could run the patch as root anyway
I think.

Interestingly, starting pd from /opt/bootlocal.sh as root at startup
will make Pd use all of the CPU and hence produce stuttering audio. When
I change the corresponding line in /opt/bootlocal.sh to start as user tc
	sudo -u tc /home/tc/myPdStartupScript.sh
Pd runs normally.

> > This might be off-topic, but has anyone managed to create a persisntent
> > home directory inside /dev/mmcblk0p2 (the ext2/3 partition created by
> > piCore itself, which I did maximize already)?
> You can use the command `filetool.sh -b` to backup a snapshot of the homedir
> to the SD card and it will be returned to that state on reboot.
This is what I read from the docs and what I am currently using. Albeit,
I am having a 300MB sound file in my home dir and it being part of the
filetool.sh backup immensely slows down startup as the OS has to
uncompress the audiofile.

> There is also a kernel boot parameter to make the homedir persist
> automatically:
> http://forum.tinycorelinux.net/index.php?topic=15450.0
This is the method I am trying to use with a directory inside
/dev/mmcblk0p2 (the ext2/3 partition created by piCore itself, which I
did maximize to the full available space on the memory card).
Possibly I have to try to shrink that partition to make space for yet
another partition as dedicated /home. Any hints appreciated!

> > I am so happy my patch runs without dropouts on the RPi 1 and that it
> > boots so fast!
> I'm a huge fan of this platform too! I had the original RPi 1 rendering mod
> files to Alsa out and only using 4% CPU.
> Probably OT but I gave a talk about my experience with piCore last night at
> the local Linux users group:
> https://github.com/chr15m/gnu-linux-in-tiny-places-plug
Nice, great talk!


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