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Re: Need Info on FootPrint and bootup time
- From: elektrknight at att dot net
- To: <mahesh dot kalachary at wipro dot com>, <ecos-discuss at sourceware dot org>
- Date: Tue, 15 Nov 2005 17:37:59 +0000
- Subject: Re: [ECOS] Need Info on FootPrint and bootup time
Mahesh,
> 1. Memory Footprint, dynamic RAM usage for a bare minimum kernel
In my experience with ARM7TDMI you can get the kernel down to about 2kB of RAM.
Of course you have to compromise and tune it but it still a usable system.
Once I got to 2kB I have stopped tunig it that but I think it could be squeezed
even more.
In my case the port was for Philips ARM family of LPC213x/4x. On a high end
devices like LPC2138 and LPC2148 it gives you about 30kB or 38kB of RAM for
user applications which is plenty for me.
>2. Boot up time
Depends on your start-up code and specific CPU, do you intialize a lot of hardware?
If not then it can be very fast.
>3. Interrupt latency
I have not measured it yet and I am very curious if anybody has a hard interrupt latency
and jitter numbers.
Thanks,
Pawel Wodnicki
-------------- Original message ----------------------
From: <mahesh.kalachary@wipro.com>
>
> Hi Guys,
>
> I need the below details w.r.t to eCOS. The H/W is based on ARM7TDMI,
>
> 1. Memory Footprint, dynamic RAM usage for a bare minimum kernel
>
> 2. Boot up time
>
> 3. Interrupt latency
>
> Best regards,
> Mahesh. K
>
>
>
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