fdtdump: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/fdtdump - from package: dtc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/fdtdump - from package: device-tree-compiler

You may install the required package with command apt-get install {package}

Error in other languages:
fdtdump: bevel nie gevind nie
fdtdump: comandă negăsită
fdtdump: comando não encontrado
fdtdump: commande introuvable
fdtdump: command not found
fdtdump: käsku ei ole
fdtdump: không tìm thấy lệnh
fdtdump: komanda nerasta
fdtdump: Kommando nicht gefunden.
fdtdump: kommandot finns inte
fdtdump: komut yok
fdtdump: nie znaleziono polecenia
fdtdump: níor aimsíodh an t-ordú
fdtdump: no se encontró la orden
fdtdump: no s'ha trobat l'ordre
fdtdump: opdracht niet gevonden
fdtdump: parancs nem található
fdtdump: perintah tidak ditemukan
fdtdump: príkaz nenájdený
fdtdump: příkaz nenalezen
fdtdump: команда не найдена
fdtdump: командата не е открита
fdtdump: 命令找不到
fdtdump: コマンドが見つかりません