Hi, as explained here http://community.arm.com/message/25127, it is possible to boot the raspberry 2 in secure mode, by adding the kernel_old=1 option in config.txt. The main effects of this option are: - all 4 cores start executing in secure SVC mode instead of non-secure SVC mode - all 4 cores start at 0x0000 instead of 0x8000 - the initial boot code that setup SMP and exits secure mode is not executed
After browsing u-boot's source code, it seems that their boot code is more or less extracted from what u-boot is doing. However I didn't manage to compile u-boot for the raspberry 2 supporting this secure mode.
Could anyone explain me what options I need to configure in rpi_2_defconfig so that u-boot supports secure boot for the raspberry 2 and what the boot sequence will be in this case ? I don't mind fixing the code if necessary but I'm a bit lost in the order of events in the initialization.
Best, Vincent