Alexander Holler wrote:
And I think too that all this can be handled by adding a kernel (e.g. with integrated minimal initramfs) to u-boot. At least that is how I have handled such in the past.
I agree that graphics (apart from a logo) should be handled outside U-boot proper - my own rationale for this being "how essential is this for the primary operation of a bootloader, which is to set the system up for execution of the main payload as quickly as possible ?"
The bootloader can still manage to provide quick feedback on which kind of boot it is performing, normal or upgrade, for instance by loading a different logo for each case; any message such as "please wait for upgrade start" can always be designed into the upgrade case logo on a comfy workstation -- preferably with Gimp or Inkscape. :)
Regards,
Alexander
Amicalement,