Kenneth, I did some fastboot work for 5121 a few months ago. U-boot, kernel and JFFS2 rootfs in NOR. My reset to userland time was 2.0 seconds, where userland was first command executed in first rc.whatever file, so it included the time for /sbin/init to get up and start running the rc scripts.
I did some profiling and noticed that the JFFS2 boot time was a significant hunk (not just the first time but everytime). I ran sumtool on the JFFS2 image and it dropped 600 ms from the boot time so my final time was 1.4 seconds. The sumtool program has been around for a few years but it was news to mean when I found it. John On Fri, May 29, 2009 at 5:13 AM, Kenneth Johansson <kenn...@southpole.se>wrote: > http://www.cambridgewireless.co.uk/news/article/default.aspx?objid=36792 > > Anybody know what they mean by booting here. > > I have started the ads5121 board using u-boot and kernel in NOR flash > and root file system on a compact flash card connected to the IDE > interface in 2.05 second until init is started from the rootfs. > > This was fast enough for what was needed I did not try to optimize > further but since I already was in the domain where changes impacted > only a few milliseconds I have a hard time imagining going down to less > than a second. > > So I guess the only way is to skip u-boot and run linux kernel directly > out of NOR. Anyone know what MontaVista is doing ?? > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-dev >
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