proper omapfb settings for pico projector and angstrom?

what are the proper kernel command line video settings for a pico
projector and the latest binary build of angstrom? i thought it would
be something straightforward, then i found this page of beagleboard
IRC logs:

where koen claims that this is what he uses:

console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait
  omapfb.video_mode=640x480MR-16@60 omapfb.vram=4M,4M,4M

does that look about right? can it be simplified just a bit? i'm
guessing i better read up on DSS2.


Hi Robert,

This really depends on the kernel version, and 2.6.29 just went into

2.6.28 : omap-dss.def_disp=lcd omapfb.video_mode=640x480MR-16@60

2.6.29 : omapfb.mode=dvi:640x480MR-16@60


to start out simple, i'm using the most recent pre-built uImage

and since that's based on 2.6.28, i guess i'll go with the first


p.s. i actually googled madly for about half an hour looking for the
answer to that, and i couldn't find it. it seemed like such a simple
question, but googling on various combinations of beagleboard,
angstrom, pico, omapfb and others never showed me *that*.

just to clarify, *before* 2.6.28 was what i see referred to as
"DSS1"? then, if you start reading here:

it appears that 2.6.28 represents where DSS2 kicks in, right? and
that applies to the currently available 2.6.28-r17 binary angstrom

once we get to 2.6.29, though, things change yet *again*? is that
still what one would call DSS2?


Yeah, the omapfb settings aren't really documented anywhere except in
the source. But considering it's changed syntax in every kernel
version since 2.6.26 i don't think anyone wants to put those settings
'in stone' anywhere.

I do have the syntax shown here:


Yes 2.6.28 introduced the initial DSS2 changes (aka rewrite of DSS),
however they were extended even more for 2.6.29. (and probably more
for 2.6.30) Before they get mainlined...


It changed syntax a bit more often, but I try to group such changes with kernel releases, so that in a single kernel version you get the same interface. For 2.6.29 I cheated a bit, since the sysfs interface received some additions (e.g. overlay transparency, vrfb, etc).
It also helps a lot to talk to Tomi and Hardik every now and then to check about pending changes :slight_smile: