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A comment on Experiment in booting Linux fast. Parent comment
This guy stripped a Renesas SH7724 boot-to-UI from 19.44 seconds down to 0.77.
http://elinux.org/images/f/f7/RightApproachMinimalBootTimes....
The tl;dr is that there's a lot in the kernel you can disable or strip away if your target system doesn't need it. The section on optimizing your application for block-oriented storage (like NOR flash) is a great one too.
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This guy stripped a Renesas SH7724 boot-to-UI from 19.44 seconds down to 0.77.
http://elinux.org/images/f/f7/RightApproachMinimalBootTimes....
The tl;dr is that there's a lot in the kernel you can disable or strip away if your target system doesn't need it. The section on optimizing your application for block-oriented storage (like NOR flash) is a great one too.