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bootloader - raspberry pi won't boot after some bootcode.bin update
Question/posting: After performing a system update a few days ago, my raspberry pi does not boot up anymore.

Thread/answer has a number of good postings including suggestion to replace the boot loader (/boot folder and/or start.elf file).
boot  bootloader  raspberrypi  raspbian  adtinc 
4 days ago by cyberchucktx
New Pi 3 B+ not booting - ModMyPi | Forum
Question/post: I ordered 2 X RPi 3B+ (order date 14 Mar 2018 12:36:10 GMT ) and have used it twice. But now one has failed as it now gives a thunder icon on the boot screen with no further booting.

Many answers in the thread, some suggest replacing the boot loader (start.elf)
raspbian  raspberrypi  boot  adtinc  bootloader  modmypi 
4 days ago by cyberchucktx
Fix for "Not booting on new Raspberry Pi Model 3 B+"
Hi everyone,

i have a brand-new Model 3 B+ and it seems that openhabian is not working with it.
Rainbow screen comes up and the green LED blinks 8 times, red LED is off.
Regarding to this website (https://elinux.org/R-Pi_Troubleshooting#Red_power_LED_is_blinking),
this means "SDRAM not recognised. You need newer bootcode.bin/start.elf firmware."

I used release 1.4

> Replacing the start.elf with the newest Raspian start.elf fixed it.
raspbian  boot  bootloader  bug  raspberrypi  adtinc 
4 days ago by cyberchucktx
NetworkTarget
This seems not to work for Joerg at Cristie; Servergraph still attempts to start before a DHCP IP address is available, perhaps because I didn't check 'the right wait service':

---
If you need to delay you service after the network is up, include

After=network-online.target
Wants=network-online.target
in the .service file.

This will ensure that all configured network devices are up and have an IP address assigned before the service is started. network-online.target will time out after 90s. Enabling this might considerably delay your boot even if the timeout is not reached.

The right "wait" service must be enabled too (NetworkManager-wait-online.service if NetworkManager is used to configure the network, systemd-networkd-wait-online.service if systemd-networkd is used, etc.). systemd-networkd.service has Also=systemd-networkd-wait-online.service in its [Install] section, so when systmed-networkd.service is enabled, systemd-networkd-wait-online.service will be enabled too, which means that network-online.target will include systemd-networkd-wait-online.service when and only when systemd-networkd.service is enabled. NetworkManager-wait-online.service is set up similarly. Verify that the right service is enabled (usually only one should be):

$ systemctl is-enabled NetworkManager-wait-online.service systemd-networkd-wait-online.service
disabled
enabled
systemd  systemctl  network  up  ip  dhcp  address  servergraph  fails  start  on  boot 
12 days ago by theskett

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