EDIT: 01 September 2012: NO NEED for my custom builds now as current Rockbox release candidates and daily builds have the Meier crossfeed patch built-in. Rasher's daily builds are great, that's what I'm running now.
To have the Rockbox database scan properly add an empty file database.ignore to /mnt/storage (your default directory in the Android file manager) and then add an empty file database.unignore to the top level of any directory you want recursively scanned.http://rasher.dk/rockbox/android/
I build Rockbox for my different players with the Meier crossfeed patch. Here is an android package for screen size 480x800, it works really nicely on my A43IT running a recent firmware (2.4.82).http://www.mediafire.com/?e14bl762r789mnc
This is built from 3.10 final and the only modification is the Meier patch, which you can see at http://www.rockbox.org/tracker/11767
Some info about the Meier crossfeed: http://www.meier-audio.homepage.t-online.de/crossfeed.htm
About the Rockbox Android port: http://www.rockbox.org/wiki/AndroidPort
You can find on that page links to Rasher's daily builds from unmodified source. My experience has been that some work well and some don't, which is to be expected on an unstable port. The source from the last stable release, 3.10, produces a really nice stable, fully functional build.
I obtain source using git and I build on a Debian Stable x86 PC. My package is signed only with the debug key so you can't upgrade to or from someone else's Rockbox build; you need to uninstall RB and then install the RB you want. The signing offers no guarantee of the package's integrity, or of mine. I offer the package as a convenience as it costs me nothing to do so except a few minutes of my time.
I expect that this build will work on any Android device with a screen resolution 480x800 or larger but I only have the A43IT and that is the only device on which I know it works.
If someone wants the same package for a bigger screen size then let me know by replying in this thread and I can do it. I don't know the screen sizes of the other gen8 devices but the sizes I can build are (I think):
Other sizes would have problems with font and icon sizes. I will only build version 3.10 and don't intend to build a newer version until the next stable Rockbox release. In the meantime Technical Support is available toll free at 0800-UR-MOM.