On 10 May 2016 at 01:16, Alistair Francis <alistair.fran...@xilinx.com> wrote: > It is actually a u-boot problem. I originally just assumed it was a > Linux problem, but it happens before u-boot hands off to Linux.
OK, that makes sense. u-boot tends to be a bit lower level and less hardware-agnostic. I just wanted to check it wasn't caused by some problem in QEMU's EL3 support we could easily fix. > It appears that u-boot won't work at all with EL3 enabled but EL2 > disabled. It always moves to EL2 before moving to EL1 and there is no > code prepared to handle going from EL3 directly to EL1. > > Just for the record, I'm specifically talking about what happens in > the do_nonsec_virt_switch() function. > > It looks like there are three options: > 1. Add support to u-boot to drop from EL3 to EL1 (I'm assuming this > is possible, as not all implementations have EL2) > 2. Just wait until QEMU adds EL2 support > 3. Allow a QEMU command line option to start in EL1 instead of EL3 I would be OK with any of these three from a QEMU perspective. Fixing u-boot is probably conceptually the nicest but I've never looked at u-boot internals so it could be simple or painful... Edgar, do you have the list of what we're still missing before we can turn on EL2? thanks -- PMM
