I hope I am posting this in the correct place. I have got some old MP3/MP4 players that use a Freescale, originally Sigmatel, STMP3780 SoC. Sigmatel and Freescale are both out of business, and I am trying to find the SDK and Datasheets for this chip so I can write my own firmware for them. I know they are old and outdated, but I enjoy re purposing the old to give them life again.
I have contacted NXP and they said they delete all documents/files for unsupported products, and they suggested I try here.