Today I found an old MP3 player in a drawer. It's a Philips GoGear Vibe with the model descriptor SA4VBE. The front page of Rockbox, while listing some other Philips GoGear models, does not mention the SA4VBE model.
General rule of thumb -- if it's not mentioned, it's because there's no support for it. (The
https://www.rockbox.org/wiki/TargetStatus page has a lot more about various works-in-progress though )
However, I found this IRC log from 2013 that mentions a SA4VBE build:
https://www.rockbox.org/irc/log-20131207
That conversation was about folks trying to reverse-engineer the stock firmware image.
Since the most recent release seems to have dropped support for some platforms, would I be correct in assuming that there once was a Rockbox build for SA4VBE and that it has simply been taken out of support?
In a word... nope.
4.0 was notable in that it was the first time support for previously-stable devices had ever been removed. In addition to those, some incomplete ports (that hadn't been worked on in well over a decade and in some cases, were never capable of being compiled) were also removed.
From what I can tell, that GoGear Vibe (indeed, the SoC family it is based on) never saw anything more than some preliminary experimentations.