[meta-ti] Pandaboard ES boots but display not working

[Evade Flow]

I know Pandaboard support in meta-ti is completely unofficial, but I
have one (ES, rev B1) to play around with, so I've been trying to get
Yocto's core-image-sato to run on mine, following the directions in this
blog post:

  - http://maniacbug.wordpress.com/2012/08/03/pandayocto/

My build configuration looks like this:

OE Build Configuration:
BB_VERSION        = "1.15.2"
TARGET_ARCH       = "arm"
TARGET_OS         = "linux-gnueabi"
MACHINE           = "pandaboard"
DISTRO            = "poky"
DISTRO_VERSION    = "1.2.1"
TUNE_FEATURES     = "armv7a vfp neon cortexa9"
TARGET_FPU        = "vfp-neon"
meta
meta-yocto        = "denzil:f6b83ac65be48a31510cda0df423f53d0f477046"
meta-ti           = "(nobranch):30fb40ebc13614a74c2e237927c60ac43e01d1bc"

It boots to a prompt in the serial console, but the display attached to
the DVI port never comes up.  I see a bunch of these errors fly by in
the console:

[606810.212] (==) FBDEV(0): Backing store disabled
[606810.213] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[606810.213] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[606810.213] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[606810.213] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[606810.213] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[606810.213] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
...

Complete Xorg.log is at http://pastebin.com/ry6m67Jw, in case it
helps. The dmesg output is at http://pastebin.com/az0b4itb.

I would *love* to see some graphics on this thing. Any advice about how
to troubleshoot this?