====== Headless setup ======

===== Enable SSH at first boot =====
Create a file name "ssh" in the boot partition

===== Since April 2022 - setup user account =====
[[https://www.raspberrypi.com/news/raspberry-pi-bullseye-update-april-2022/|An update to Raspberry Pi OS Bullseye]]

Create file named "userconf" in the boot partition

The contents should be in the form
<code>
pi:$6$o./WGPVrH4SYmDs/$88CAS1V7inbLrzAZ1CVk984zLzJYe5IKV5SGyMgjaNtHSHhuYzFQLbQY9G.XkxlZjaEi3/fnphUBmF7EBZt0I1
</code>

The password hash can be created by running a command like this
<code>
echo 'raspberry' | openssl passwd -6 -stdin
</code>

===== Enable WiFi using NetworkManager =====
Create file /etc/NetworkManager/system-connections/<ssid_name>.nmconnection
<code>
[connection]
id=<ssid>
uuid=<uuid>
type=wifi
interface-name=wlan0
timestamp=1697375379

[wifi]
mode=infrastructure
ssid=<ssid>

[wifi-security]
auth-alg=open
key-mgmt=wpa-psk
psk=<PSK in plaintext>

[ipv4]
method=auto

[ipv6]
addr-gen-mode=default
method=auto

[proxy]
</code>

Set correct permissions
<code>
chmod 600 /etc/NetworkManager/system-connections/<ssid_name>.nmconnection
</code>

Remove NetworkManager.state file as that by default disables WiFi
<code>
rm /var/lib/NetworkManager/NetworkManager.state
</code>

====== Valgrind ======
[[https://bugs.launchpad.net/raspbian/+bug/1743293]]
[[https://snapcraft.io/valgrind]]

Install newer valgrind for example by using a snap package \\
Use this configuration to suppress some non-real errors

<code>
cat ~/.valgrindrc
--sigill-diagnostics=no
--suppressions=/home/pi/.valgrind.supp

cat ~/.valgrind.supp
{
  libarmmemv7laddr8
  Memcheck:Addr8
  obj:/usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so
}
{
  libarmmemv7laddr4
  Memcheck:Addr4
  obj:/usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so
}
{
  libarmmemv7laddr2
  Memcheck:Addr2
  obj:/usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so
}
{
  libarmmemv7laddr1
  Memcheck:Addr1
  obj:/usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so
}
</code>