Otherwise, checking out branches is too insane, as it does not
update the worktrees, even though the gem5/gem5 module was updated.
gem5: expose build types, document debug builds.
simultaneous runs: store stdout and stderr on a file to allow running
all from a single terminal on the background cleanly.
As noted however, it is potentially too slow to be useful.
run: unify gem5 and qemu tracing under -T
readme: overhaul tracing documentation from what I've learnt from trace2line
Split optional and required kernel configs into separate files.
readme: describe how our kernel configs are generated from Buildroot
readme: document QEMU `-no-reboot` and speculate gem5 `panic_on_panic`
in preparation for some more automated bisection with ktest.
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.
run: pass the console_msg_format=syslog boot parameter by default,
to allow seeing what is the priority of messages on the terminal.
Document printk better.
This is cleaner as it removes yet another .gitignore rule and allows
for one command per arch.
This was prompted by the recent Docker patch creating files as root,
which then breaks future host runs.
Also separate all arguments by newlines. This:
- makes it much easier to minimize when reporting QEMU bugs
- shows the full command on the screen despite line wrapping being turned off
by one of the annoying emulators, to be investigated.
The commands are not yet pristine, because:
- there are some leading spaces
- options not sorted
but it is already a huge improvement, and those operations are now be easy from Vim.
The general strategy is:
- end every variable containing a command with a newline
- when expanding such variables, don't add an extra newline
