On Sun, 23 Feb 2020 14:07:27 -0800 (PST), in
gmane.comp.hardware.beagleboard.user
[email protected] wrote:
>
>
>
>My application uses a beaglebone black rev C. The application is written in
>python and uses serial ports, Adafruit_BBIO.PWM and GPIO and is started by
>systemctl as a service. There is no graphical interface, just an LCD
>controlled with GPIO. It takes 90 seconds after boot up before the program
>sounds the 'greeting' with PWM. I need to reduce this to <10 seconds. I had
>high hopes for an older 2Gb image, but I think it predated the universal
>cape and I was having trouble getting it to work. There is also an IOT
>image, but some gpio's didn't work. After update_kernal.sh the gpio's
>worked and I'm on 4.14.108. I'm not sure this is even the IOT image
>anymore. I've tried various tweaks I've found on the web without much
>success. Can I make a standard image work and if so how? Must I create my
>own image? Where do I start? Thank you, Mike.
While it won't catch pre-kernel activity, have you checked the dmesg
list for what may be taking a long time in the start up sequence.
debian@beaglebone:~$ dmesg
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.14.108-ti-r113
(root@x1-am57xx-beagle-x15-2gb) (gcc version 6.3.0 20170516 (Debian
6.3.0-18+deb9u1)) #1 SMP PREEMPT Wed Jul 31 00:01:10 UTC 2019
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7),
cr=10c5387d
<SNIP>
[ 1.403928] of_cfs_init
[ 1.404112] of_cfs_init: OK
[ 1.405499] ALSA device list:
[ 1.405510] No soundcards found.
[ 1.412495] Freeing unused kernel memory: 1024K
[ 23.407696] EXT4-fs (mmcblk0p1): mounted filesystem with ordered data
mode. Opts: (null)
[ 24.075336] systemd[1]: System time before build time, advancing clock.
<SNIP>
Some 20+ seconds seem to have been lost in mounting the uSD file system
[ 24.172908] ip_tables: (C) 2000-2006 Netfilter Core Team
<SNIP>
[ 25.507732] pru-rproc 4a338000.pru: PRU rproc node
/ocp/pruss_soc_bus@4a326004/pruss@0/pru@38000 probed successfully
[ 26.566698] systemd-journald[1665]: Received request to flush runtime
journal from PID 1
[ 33.501536] nf_conntrack version 0.5.0 (8192 buckets, 32768 max)
[ 33.810548] pvrsrvkm: loading out-of-tree module taints kernel.
<SNIP>
Another 6+ seconds going from the flush to nf_conntrack
<SNIP.
[ 38.310254] IPv6: ADDRCONF(NETDEV_UP): usb0: link is not ready
[ 38.365824] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready
[ 38.718825] IPv6: ADDRCONF(NETDEV_UP): usb1: link is not ready
debian@beaglebone:~$
And 39 seconds, it is all ready. That is on an IoT image.
--
Dennis L Bieber
--
For more options, visit http://beagleboard.org/discuss
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