From: Geoff Smith <gjsmith@vardr.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: Just how fast is barebox?
Date: Mon, 28 Mar 2011 21:54:56 +1000 [thread overview]
Message-ID: <AANLkTikxqQzp2HWV=Tenu6TTs1BjsBpNURqyigOkf-ZQ@mail.gmail.com> (raw)
In-Reply-To: <20110328084642.GG7285@pengutronix.de>
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Thanks, very helpful info.
Looks like I may have to do something light weight like ecos.
I believe redboot is based on ecos so there may be a starting point there
for the i.mx27.
Regards
Geoff
On Mon, Mar 28, 2011 at 6:46 PM, Sascha Hauer <s.hauer@pengutronix.de>wrote:
> Hi Geoff,
>
> On Mon, Mar 28, 2011 at 01:25:18PM +1000, Geoff Smith wrote:
> > Apologies for the newbie question. I am looking for a fastboot option for
> > the i.MX27
> >
> > I want to be capturing video data from a cold start within 300ms
> (preferably
> > 200ms).
>
> The best I could get out of an i.MX27 was about 700ms. The main limiting
> factor is how fast you can load an image from the boot medium (Nand
> flash in my case). Given that I can read from Nand with 16MB/s a 5MB
> image takes about 300ms to load. I think you'll need many dirty tricks
> doing this with Linux, like a massively stripped down kernel and perhaps
> starting the capture in the kernel (not in the application).
>
> I wouldn't say it's not possible, but it's definitely a hard task.
>
> Sascha
>
>
> --
> Pengutronix e.K. | |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
>
--
*Geoff Smith
*
*Founder and CTO*
*gjsmith@vardr.com <mark@vardr.com>*
*+61 4 1200 7354
*
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prev parent reply other threads:[~2011-03-28 11:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 3:25 Geoff Smith
2011-03-28 8:46 ` Sascha Hauer
2011-03-28 11:54 ` Geoff Smith [this message]
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