Thanks Robert, 
As suggested in link https://github.com/RobertCNelson/boot-scripts/issues/10 , 
I already applied the many changes.
In very initial, my system was taking total 90 sec as boot time which got 
reduced and now it's 54 sec approx. 

I also check to nuke generic-board-startup.service but not able to reduce 
further. can u suggest few example for which I need to reduce?
I removed the USB flash related things.
 not getting the exact reason why * 51.048s dev-mmcblk1p1.device *this is 
taking too much time and is there any way that we can reduce it?

Thanks
Karishma Jaiswal

On Monday, May 24, 2021 at 9:12:08 PM UTC+5:30 RobertCNelson wrote:

> On Sun, May 23, 2021 at 9:19 PM Karishma Jaiswal
> <karry....@gmail.com> wrote:
> >
> > @Dennis L Bieber Really thanks for your detailed explanation about the 
> each services.
> > I also updated ubuntu from 16 to 18 and done some modification in the 
> services. now my board's logs are as below
> > My system should be working as station mode but may be future, we will 
> add AP mode also.
> > I will also remove nginx services.
> >
> >
> > ubuntu@beaglebone:~$ systemd-analyze blame
> > 51.048s dev-mmcblk1p1.device
> > 28.951s generic-board-startup.service
> > 6.550s led-status.service
> > 6.133s systemd-hwdb-update.service
> > 4.805s grub-common.service
> > 4.611s loadcpufreq.service
> > 3.244s nginx.service
> > 3.053s systemd-udev-trigger.service
> > 2.971s avahi-daemon.service
> > 2.099s ssh.service
> > 1.958s archive_log.service
> > 1.839s keyboard-setup.service
> > 1.548s rsyslog.service
> > 1.512s connman.service
> > 1.438s systemd-user-sessions.service
> > 1.404s wpa_supplicant.service
> > 1.315s ofono.service
> > 1.291s systemd-logind.service
> > 1.275s cpufrequtils.service
> > 1.253s tacread-keymap.service
> > 887ms systemd-timesyncd.service
> > 786ms us...@0.service
> > 685ms systemd-journald.service
> > 508ms kmod-static-nodes.service
> > 498ms dev-mqueue.mount
> > 487ms fake-hwclock.service
> > 469ms sys-kernel-config.mount
> > 459ms systemd-fsck-root.service
> > 422ms systemd-tmpfiles-setup-dev.service
> > 406ms systemd-modules-load.service
> > 401ms systemd-sysctl.service
> > 390ms systemd-tmpfiles-setup.service
> > 387ms setvtrgb.service
> > 350ms nvda.service
> > 341ms sys-fs-fuse-connections.mount
> >
> >
> > Also want to know that in ubuntu 18, why below two task taking so much 
> time and how we can reduce it further to achieve the over all boot time as 
> 30 sec. Any suggestion will help me.
> >
> > 51.048s dev-mmcblk1p1.device
> > 28.951s generic-board-startup.service
>
> as long as you don't use usb-serial, usb-flash, or usb-networking on
> the "OTG" USB port, you can nuke generic-board-startup.service
>
> Regards,
>
> -- 
> Robert Nelson
> https://rcn-ee.com/
>

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