board: freebox: nbx10g: add emmcboot for dual-bank eMMC boot

Add the emmcboot command as board-specific support for the Nodebox 10G.

This is a legacy boot format that has been in production on this board
for many years so it cannot change anymore. It implements a dual-bank
boot system for reliable firmware updates:

- Bank0: Stable/fallback boot image
- Bank1: Newer/test boot image with reboot tracking

The boot order depends on the nrboot counter stored in eMMC:
- Healthy state (counter < 4): Try Bank1 first, then Bank0
- Degraded state (counter >= 4): Try Bank0 first, then Bank1

Each bank stores an image tag with CRC32 validation. The counter uses
a bit-counting scheme for wear leveling and tracks consecutive failed
boots to trigger automatic fallback.

Signed-off-by: Vincent Jardin <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>

0 files changed, 0 insertions, 0 deletions