[U-Boot] [PATCH] qemu-arm: Add persistent environment support

[Daniel Thompson]

On Thu, Dec 13, 2018 at 02:43:58AM +0200, Tuomas Tynkkynen wrote:
> > Another use case is atf + u-boot (although I don't know people are
> > interested in it). Put bl1.bin in flash0(0x0-0x4000000) and put
> > fip.bin in flash1(0x4000000-0x8000000). Please note that, with
> > secure=on, flash0 is in secure and flash1 is in non-secure.
> > While I admit that your patch is workable, my point is that there are
> > different use cases and it may not be a good idea to put one
> > configuration in qemu-arm.h.
> 
> Can EDK2 in QEMU boot with ATF and if so, how does it lay out things?
>
> Would it be possible to build U-Boot in such a way that u-boot.bin
> could be substituted in existing build scripts or instructions in place
> of the EDK2 binary so that things still work the same?
> 
> Or in other words, if EDK2 has already has a working
> implementation of something (such as the flash layout), IMO we should
> prefer to use that instead of reimplementing it in a different
> way.

The EDK2 binaries I am using don't include ATF. IIRC qemu with default
arguments boots directly into EL1 so most of the off-the-shelf binaries
will not include a trusted firmware.

EDK2 keeps its varstore on the second pflash.


Daniel.