green LED flashes 4 times - rpi B 3+ but works USB-boot

From	Björn Lundin <b.f.lundin@gmail.com>
Newsgroups	comp.sys.raspberry-pi
Subject	green LED flashes 4 times - rpi B 3+ but works USB-boot
Date	2021-01-12 22:03 +0100
Organization	A noiseless patient Spider
Message-ID	<rtl2rb$spr$1@dont-email.me> (permalink)

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Hi!

I have for a long time run a rpi 3B+ by having

/boot
/

on the SD card
and all application specific stuff on a small
(80 GB) USB-disk 2.5" spinning metal

So the other day I bought a 120 GB SSD disk at amazon 
<https://www.amazon.se/dp/B077QTGTDV?ref_=pe_20773151_507143461_E_301_dt_1>

And I use gparted on another Linux box to
- clean out the new SSD
- copy /boot from SD card and paste on SSD
- copy / from sdcard  and paste on SSD
- copy /bnlbot from old USB-drive and paste on SSD

The whole procedure was very smooth - I did not know of copy/paste 
within gparted before.

in /boot/cmdlie,txt I changed the root UUID
in /etc/fstab I did the same, changing UUID and PARTITIONUUID
to new values.

Nice - unmount from PC and put SSD in rpi via USB - with no SD card
Power on

LED flashes 4 times - seem to mean
<https://elinux.org/R-Pi_Troubleshooting#Green_LED_blinks_in_a_specific_pattern>

* 4 flashes: start.elf not launched

But - the PI works,
I can SSH to it
the database works,  my applications has started.

dmesg confirms boot from USB (well there is no SD-card so)

Everything but the LED seems fine

Why does it flash?
I cannot google an answer to make it not flash


-- 
Björn

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green LED flashes 4 times - rpi B 3+ but works USB-boot Björn Lundin <b.f.lundin@gmail.com> - 2021-01-12 22:03 +0100
  Re: green LED flashes 4 times - rpi B 3+ but works USB-boot Chris Elvidge <chris@mshome.net> - 2021-01-13 14:07 +0000
    Re: green LED flashes 4 times - rpi B 3+ but works USB-boot Björn Lundin <b.f.lundin@gmail.com> - 2021-01-13 19:10 +0100

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