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af210a7671
gem5 requires armv7, and we learnt that the versatiledb we were using was pre-v7. We could have moved to -M vexpress-*, but in the end decided to go for -M virt due to its simpliciy, and uniformity with aarch64. platform_device: does not work anymore and was removed, since it was tied to versatilepb. We left a mention on the README and removed all in tree source. The QEMU patch is still left as it was. As a consequence, the linux tree had no other patches, and we now use vanilla linux by default, which is a great thing for reproducibility. Another consequence is the /poweroff.out works for arm -M virt, and we removed all mentions of the problem.
= gem5 We Build gem5 as a Buildroot package for the following reasons: * if we build in tree without Buildroot, we still want to build the `m5` tool through Buildroot. But then Buildroot rsyncs the build for all archs into `output/build`, which takes quite some disk space. There seems to be no way to exclude some packages from the sync. * it allows us to reuse Buildroot's: ** configuration system, which reduces duplication: set the gem5 package option, everything just gets built ** timestamping system, which could save a few seconds on rebuilds, since we then don't ever run `scons` when gem5 is not modified What is preventing upstreaming to Buildroot: a minimal kernel config like the ones QEMU has.