OpenBMC Boot time improvements

[Patrick Williams]

On Mon, Sep 12, 2022 at 01:32:19PM -0700, Ed Tanous wrote:

> Decompressing the dtb, initramfs, and kernel images is seconds 5-14.  If
> there's a way to optimize that better that u-bmc has implemented ahead of
> us, that seems like an area for improvement that we could pull in.

I switched some systems to use zstd instead of xz.  I'm not sure if that
was done as a default or not, but it is significantly faster for
decompression.

> Kernel starts at ~20 seconds, then 3.5 seconds of dead air... not sure
> what's going on there.

This is probably the kernel self-decompression.

-- 
Patrick Williams
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