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Re: SCM20 board problem
- From: Daniel Morris <danielm at eCosCentric dot com>
- To: Luca Formaggio <luca_formaggio at yahoo dot it>
- Cc: ecos-discuss at sources dot redhat dot com
- Date: Thu, 5 Feb 2004 17:21:39 +0000
- Subject: Re: [ECOS] SCM20 board problem
- References: <20040205150116.47376.qmail@web41409.mail.yahoo.com>
On Thu, Feb 05, 2004 at 04:01:16PM +0100, Luca Formaggio wrote:
> Hi,
> I use SCM20 MIPS board. I have no problem to compile
> for this board but the execution is very slow (the
> application is quite simple). For example is more
> slower than the simulator. I compile the file for
> debug application.
> Someone have any idea on this strange case?
This may not be so strange. Is your simulator cycle accurate? If
you're using an instruction set simulator only, such as SID, then
you are likely to find that the performance of the simulated target
will be a function of the host machine. Typical reports of SID
usage have shown the effective target speed to be around 1/6 of
the host PC - so on a 2.4GHz host the target would appear to be
running at about 16 times the speed of your actual hardware.
Have you built the eCos tests? How did the output of tm_basic compare
to published results for similar target hardware?
Daniel
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