Kenneth,<br><br>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.<br>
<br>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.<br>
<br>John<br><br><div class="gmail_quote">On Fri, May 29, 2009 at 5:13 AM, Kenneth Johansson <span dir="ltr"><<a href="mailto:kenneth@southpole.se">kenneth@southpole.se</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<a href="http://www.cambridgewireless.co.uk/news/article/default.aspx?objid=36792" target="_blank">http://www.cambridgewireless.co.uk/news/article/default.aspx?objid=36792</a><br>
<br>
Anybody know what they mean by booting here.<br>
<br>
I have started the ads5121 board using u-boot and kernel in NOR flash<br>
and root file system on a compact flash card connected to the IDE<br>
interface in 2.05 second until init is started from the rootfs.<br>
<br>
This was fast enough for what was needed I did not try to optimize<br>
further but since I already was in the domain where changes impacted<br>
only a few milliseconds I have a hard time imagining going down to less<br>
than a second.<br>
<br>
So I guess the only way is to skip u-boot and run linux kernel directly<br>
out of NOR. Anyone know what MontaVista is doing ??<br>
<br>
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