Hi,
I am working with a board called "up board" ( http://www.aaeon.com/en/p/up-board-computer-board-for-professional-makers) from aaeon.
This card is as tiny as a credit card or a raspberry pi running with a x86_64 processor.
It buildin an UEFI BIOS and a MMC memory (no sdcard, no ssd, no sata, no rom).
I know this is not really adapt to an embedded usage but i would like to let my u-boot bootloader loading my gnu/linux kernel (using the bootefi command) then my linux rootfs (generated by yocto) :
(UEFI / BIOS) -> (uboot uefi) -> (GNU/Linux kernel) --> (linux rootfs)
I do not want to use grub or grub uefi if possible.
My idea is to make a uefi partition on the eMMC memory.
I am looking for an uboot configuration i can use to compile my bootloader.
I have make tests with the u-boot-app.efi that i have compiled and set into an efi paritiion ; i am booting into an usb key first. This is not working and always stop at the uefi shell...
Maybe my u-boot-app.efi need to be signed ?
Is there a documentation that describe all steps required ?
Any help welcome in order to solve my use case. Thanks in advance.
Regards
Thierry