If you lost the boot logo and want it back:

upload (FTP) logo.img attached into /tmp

telnet/ssh:

dd if=/tmp/logo.img of=/dev/block/by-name/logo

• To save original logo.img use command
  dd if=/dev/block/by-name/logo of=/tmp/logo.img

• To strip the dumped file: strip.py logo.img

• To convert the extracted logo to jpeg: hisi2jpeg.py logo.img

• To convert your own jpeg logo to hisi format:
  jpeg2hisi.py logo.jpg

the jpeg needs to use 4:2:0 chroma subsampling to be managed by the Hisi soc (#2)