Ferguson STBs

Hi all! Our current HTPC runs happily with Leap + Kodi, but it's too bulky for most of the prospected new furniture ;) After a lot of research for FLOSS, I consider to replace it with a Ferguson Ariva ATV TT [1]. The Hisilicon hi3798cv200 seems to be designed specifically for STBs and is supported mainline, and even the reference board's DTS (hi3798cv200-poplar.dts) only hooks up a few LEDs to GPIOs. I assume H.264 on Panfrost works? My biggest concern however is the SoC's support for secure boot. Alternative firmware images for Ferguson boxes show now hints towards that, but maybe someone here can confirm this? Any other hints or pointers? Torsten [1] http://ferguson-digital.eu/de/ariva-atv-tt-tuner-2/