Add splash screen for CM-T35

This patchset adds splash screen support for CM-T35.
It includes the ability to initialize the display subsystem either using predefines (selected via env variable "displaytype"), or user supplied configuration options, also stored in an environment variables and pointed to by displaytype. The splash image data is currently read from NAND.

As a preparation for the above functionality this patchset adds:
- new DSS #defines
- an option for board-specific splash screen preparation, which can be invoked in lcd_logo() right before displaying the splash screen (typical use case:
load the image data from non-memory mapped storage in time for it to be displayed).
- struct panel_config is extended to support setting the gfx_format dynamically
- protection from data aborts due to unaligned bmp headers is added to lcd_logo's splashscreen section (I'm also looking into refining this protection later on).

Changes in V3:
- No unnecessary #defines in arch-omap3/dss.h [Wolfgang Denk]
- Reworded patch 2 comment [Wolfgang Denk]
- Used a #define for cmap addr [Wolfgang Denk]

Changes in V2:
- DSS #defines are defined shiften where possible [Jeroen Hofstee]
- GFXFORMAT_RGB16 now passed to omap3_dss_panel_config() in a new field of panel_cfg. Updated existing panel_config structs to set this field to the value that was originally hardcoded into omap3_dss_panel_config(). [Jeroen Hofstee]
- Used LCD_BPP for vl_bpix. [Jeroen Hofstee]
- Added a comment to explain the choice of GFXFORMAT_RGB16. [Jeroen Hofstee]
- Added an address check (and fix) to the address of splashimage in order to avoid alignment problems with bmp header. A similar check appears in board_splash_screen_prepare() for cm_t35. [Albert ARIBAUD]
- Do not manually set gfx burst size to GFXBURSTSIZE16, as it is apparently not necessary. GFXBURSTSIZE* #defines were kept in patch 1 anyway in the hope they will be useful for someone.

Nikita Kiryanov (7):
omap3: add useful dss defines
omap3: allow dynamic selection of gfx_format
lcd: prevent unaligned memory access when displaying splash screen
lcd: add option for board specific splash screen preparation
cm-t35: add support for dvi displays
cm-t35: add support for user defined lcd parameters
cm-t35: add support for loading splash image from NAND

  README                                |    8 +
  arch/arm/include/asm/arch-omap3/dss.h |   31 +++
  board/cm_t35/Makefile                 |    1 +
  board/cm_t35/cm_t35.c                 |   68 ++++++
  board/cm_t35/display.c                |  428 +++++++++++++++++++++++++++++++++
  board/htkw/mcx/mcx.c                  |    1 +
  board/teejet/mt_ventoux/mt_ventoux.c  |    2 +
  board/ti/beagle/beagle.h              |    6 +-
  common/lcd.c                          |   23 ++
  drivers/video/omap3_dss.c             |    2 +-
  include/configs/cm_t35.h              |   11 +
  include/lcd.h                         |    1 +
  12 files changed, 579 insertions(+), 3 deletions(-)

create mode 100644 board/cm_t35/display.c