pxa3xx_dump: 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/pxa3xx_dump - from package: directfb

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

Error in other languages:
pxa3xx_dump: bevel nie gevind nie
pxa3xx_dump: comandă negăsită
pxa3xx_dump: comando não encontrado
pxa3xx_dump: commande introuvable
pxa3xx_dump: command not found
pxa3xx_dump: käsku ei ole
pxa3xx_dump: không tìm thấy lệnh
pxa3xx_dump: komanda nerasta
pxa3xx_dump: Kommando nicht gefunden.
pxa3xx_dump: kommandot finns inte
pxa3xx_dump: komut yok
pxa3xx_dump: nie znaleziono polecenia
pxa3xx_dump: níor aimsíodh an t-ordú
pxa3xx_dump: no se encontró la orden
pxa3xx_dump: no s'ha trobat l'ordre
pxa3xx_dump: opdracht niet gevonden
pxa3xx_dump: parancs nem található
pxa3xx_dump: perintah tidak ditemukan
pxa3xx_dump: príkaz nenájdený
pxa3xx_dump: příkaz nenalezen
pxa3xx_dump: команда не найдена
pxa3xx_dump: командата не е открита
pxa3xx_dump: 命令找不到
pxa3xx_dump: コマンドが見つかりません