siemens: capricorn: add logic to U-Boot to avoid zig-zag boot

add logic in board code for detecting the real boot
partition and set a local hush shell variable fallback
which can be used later in boot variables for detecting
a ROM bootloader fallback case.

We use the local hush shell variable, as we do not want
to save in any case the fallback variable in U-Boot
Environment, as the default Environment is maybe saved
in boards, which are downgraded to older U-Boot versions.

And than the board code does not run, and fallback never
gets the correct value.

Introduce also hush shell variable envvers to value "v2_"
so we can use them in Environment for running different
versions of variables between new and old U-Boot images.

Signed-off-by: Heiko Schocher <[email protected]>
Signed-off-by: Walter Schweizer <[email protected]>
Reviewed-by: Peng Fan <[email protected]>

0 files changed, 0 insertions, 0 deletions