mariotpc

[Unit]
Description=Dropbear SSH server
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/sbin/dropbear -b /etc/dropbear/logo.txt
PIDFile=/var/run/dropbear.pid

[Install]

mariotpc

As the first step go to  https://matt.ucc.asn.au/dropbear/dropbear.html
after locate Download section ( on the right side ) o click on the link https://matt.ucc.asn.au/dropbear/
Select the last one according to your year ( to me is "dropbear-2017.75.tar.bz2     2017-05-18 22:55  1.5M  Link to releases directory instead" )

Tip: I copy the link with the right button over and get it using  wget
Example:
wget https://matt.ucc.asn.au/dropbear/dropbear-2017.75.tar.bz2

uncompress the bzip2 using:
tar -jxvf dropbear-2017.75.tar.bz2

mariotpc

Install the NOOBS software to SD Card is as easy as to download the BOOBS zip and unzip to the root FS onto the SDCARD with vfat format.
Just, the SDCard must be at lest 8GB.

mariotpc

from nameko.rpc import rpc

class FTHService:
        name = "CelciusToFahrenheit"
        @rpc
        def convert (self, Celcius):
                Fahrenheit = float(int(Celcius) * 1.8) + 32
                return "Hello the Fahrenheit Temp is: , {}!".format(Fahrenheit)
        
class HiService:

mariotpc

first all  the bluez apps  must be updated

root@raspberrypi:/home/pi# vi /etc/systemd/system/dbus-org.bluez.service 
add:

[Unit]
Description=Bluetooth service
Documentation=man:bluetoothd(8)
ConditionPathIsDirectory=/sys/class/bluetooth

mariotpc

DECIMAL       HEXADECIMAL     DESCRIPTION
--------------------------------------------------------------------------------
64            0x40            xz compressed data
2162688       0x210000        Squashfs filesystem, little endian, version 4.0, compression:xz, size: 6502290 bytes, 2019 inodes, blocksize: 131072 bytes, created: 2018-06-06 07:02:05
9830400       0x960000        JFFS2 filesystem, little endian


dd if=tf_recovery.img of=header.bin bs=1 count=64 skip=0
dd if=tf_recovery.img of=xzdata.xz bs=1 count=2162624 skip=64

mariotpc

My Raspberry Pi B+ comes from 5 years ago,  this was bought by me on my travel to Boston,
Fist all, you must have a GCC Cross Compiler, this could be the Linaro or some made by you using crosstool, as in my case.

Add your toolchain to your environment
PATH=${HOME}/x-tools/armv6-rpi-linux-gnueabi/bin/:$PATH
export CROSS_COMPILE=armv6-rpi-linux-gnueabi-
export ARCH=arm

[mariotpc@fedora31 u-boot]$ ls ~/x-tools/armv6-rpi-linux-gnueabi/
armv6-rpi-linux-gnueabi/ build.log.bz2            lib/                     libexec/                 

mariotpc

[root@fedora rpi]# ls -ltr
total 10970300
-rw-r--r-- 1 root     root      1566114915 Apr 10  2017 2017-04-10-raspbian-jessie.zip
-rw-r--r-- 1 root     root      1149027370 Jun 20  2019 2019-06-20-raspbian-buster.zip
-rw-r--r-- 1 root     root       452715448 May 27 20:01 raspios_lite_armhf_latest.190820.zip
-rw-r--r-- 1 root     root           83803 Aug 19 13:55 kernel-qemu-4.19.50-buster
-rwxrwxrwx 1 root     root           82044 Aug 19 13:55 versatile-pb-buster.dtb
-rw-r--r-- 1 root     root           83259 Aug 19 13:55 versatile-pb.dtb
-rw-r--r-- 1 root     root         2534200 Aug 19 15:33 kernel-qemu-3.10.25-wheezy
-rw-r--r-- 1 root     root      3774873600 Aug 19 18:00 2019-06-20-raspbian-buster.img

mariotpc

first all,... compile it and get the u-boot binary executable

[mariotpc@fedora31 u-boot]$ make vexpress_ca9x4_defconfig CROSS_COMPILE=~/Downloads/arm/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
#

mariotpc

First One, Download the kernel 
************************************************************
wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.13.tar.gz

uncompress it
************************************************************
tar -zxvf linux-4.9.13.tar.gz 

going inside
************************************************************