[PATCH v2 0/6] Move framebuffer reservation for SPL to RAM end

[Devarsh Thakkar <devarsht@ti.com>]

Move video memory reservation for SPL at end of RAM so that it does
not interefere with reservations for next stage so that the next stage
need not have holes in between for passed regions and instead it can
maintain continuity in reservations.

Also catch the bloblist before starting reservations to avoid the same
problem.

While at it, also fill missing fields in video handoff struct before
passing it to next stage.

This is as per discussions at :
For moving SPL framebuffer reservation at end of RAM:

https://lore.kernel.org/all/CAPnjgZ3xSoe_G3yrqwuAvoiVjUfZ+YQgkOR0ZTVXGT9VK8TwJg@mail.gmail.com/

For filling missing video handoff fields :
https://lore.kernel.org/all/CAPnjgZ1Hs0rNf0JDirp6YPsOQ5=QqQSP9g9qRwLoOASUV8a4cw@mail.gmail.com/

Changelog:
V2:
- Make a generic function to reserve video memory at SPL stage
- Add debug prints while skipping framebuffer allocation at uboot
- Correct commenting style as suggested

V3: 
- Change spl_reserve_video to spl_reserve_video_from_ram_top
  which enforce framebuffer reservation from end of RAM
- Use gd->ram_top instead of local ram_top and update
  gd->reloc_addr after each reservation
- Print error message on framebuffer reservation
- Update SPL doc with spl splash screen specific info

Test logs (at tip of U-Boot 2024.01-rc1 + these patches):
https://gist.github.com/devarsht/6a748b1d69bd2a4b60695a5e7776db73

Devarsh Thakkar (6):
  arm: mach-k3: common: Reserve video memory from end of the RAM
  board: ti: am62x: evm: Remove video_setup from spl_board_init
  common/board_f: Catch bloblist before starting resevations
  video: Skip framebuffer reservation if already reserved
  video: Fill video handoff in video post probe
  doc: spl: Add info regarding memory reservation and missing Kconfigs

 arch/arm/mach-k3/common.c    | 17 ++++++++++-----
 board/ti/am62x/evm.c         | 18 ----------------
 common/board_f.c             | 33 +++++++++++++++++++++++++---
 common/spl/spl.c             | 27 +++++++++++++++++++++++
 doc/develop/spl.rst          | 22 +++++++++++++++++++
 drivers/video/video-uclass.c | 42 +++++++++++++++++++++++++++---------
 include/spl.h                |  6 ++++++
 7 files changed, 129 insertions(+), 36 deletions(-)

-- 
2.34.1