Dear Dirk,
In message 50F7A2D7.90405@de.bosch.com you wrote:
Yes, we were thinking about the same use case: An U-Boot based device where U-Boot is responsible for the whole system update, including the OS. The user has to insert an USB stick or SD card containing the files to be updated. Then U-Boot has to copy these files to the NOR, NAND or whatever the system boots from. The only user interface is a display, no serial console. On the display something like "Please insert the USB stick", "Update in progress, please wait", "Update successfully finished", "Update error xx" has to be shown, then.
This has been done before, and probably many times. The last time I did that for a customer I ended up with a 7.5 kB / 111 lines shell script. OK, I did not have to support a multi-language interface, and it was all text based, but it included pretty good error handling and all the logic even to test for a specific dongle to be installed to enable the update. [And yes, it revealed a number of hush bugs, too. :-( ]
I do not relly see why we need a graphics library with all bells and whistles up to and including support for TTF here...
If you need a fancy GUI, please use an OS.
Best regards,
Wolfgang Denk