https://github.com/cirosantilli/linux-kernel-module-cheat/tree/8a2cad195b295ad02c23af7a629bd21b4a9f306d#gem5-buildroot-setup-getting-started
boots Buildroot (not Ubuntu) to shell in about 4 minutes on a P51
https://cirosantilli.com/linux-kernel-module-cheat/#p51

With Ubuntu, I would use my own minimal init rather than the super
bloated Ubuntu one.

Then you can m5 checkpoint and restore as discussed elsewhere.


On Thu, Feb 27, 2020 at 6:00 AM niranjan soundararajan
<niranja...@gmail.com> wrote:
>
> Hello
>
> We are booting Ubuntu 18.0.4 and kernel 5.2.3 on x86_64 bit core. We are 
> running the following commandline
>
> ./build/X86/gem5.opt configs/example/fs.py --disk-image=ubuntu_base_v1.1.img 
> --kernel=vmlinux-5.2.3 --cpu-type=AtomicSimpleCPU --caches --l2cache 
> --mem-size=8192MB
>
>
> We notice that the boot process starts and proceeds successfully until we hit 
> the following point (see below). Its stuck there for quite some time. I 
> wanted to check if this is common or is there something we can do to speed it 
> up? Whats sort of the typical boot times folks have seen with x86 cores (or 
> others) and is there a checkpoint we can take in case we run into errors to 
> avoid starting from scratch?
>
> [  OK  ] Reached target Remote File Systems.
>
>          Starting Availability of block devices...
>
> [  OK  ] Started Availability of block devices.
>
>
>
> Thanks
>
> Niranjan
>
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