On 4 November 2015 at 14:31, Yehuda Yitschak yehuday@marvell.com wrote:
Hello everyone
I am in the process of porting EDK2 to a Quad core Aarch64 based SOC. The SOC has a built-in BootROM running in EL3. When the BootROM completes loading The image it transfers control to the loaded image in EL3 to allow installing a secure monitor Since we have an on chip primary loader (i.e. BootROM) I used the 2nd stage template as a basis for my port
So in my flow BootROM loads FD image to main memory and jumps to the entry point in EL3 I quickly found out however that EDK2 expects to be executed in EL2 or EL1.
It was a bit surprising actually. I expected EDK2 to also act is a secure monitor and handle the PSCI calls as well.
I guess I am missing something in the functional partition.
To get to the point I would like to ask;
Who handles PSCI in Juno. I noticed the existence of ATF binariessuch as bl0 and bl3 under Juno. Does it mean Juno works with combination of ATF and EDK2 ?
Indeed. On the Juno reference platform, UEFI is merely an intermediate stage bootloader that gets loaded to DRAM by the secure firmware and executed in EL2
Is there a simple way to switch to EL2 using EDK2 packages. Iguess the Sec part is supposed to do that, right ?
Yes. ArmPlatformPkg/Sec/Sec.c should cover everything you need, although I must stress that a) this code is unused and thus untested, and b) it is not the recommended approach.
Regards, Ard.