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Re: Running Linux on FPGA

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: Running Linux on FPGA
From: Jan Engelhardt <jengelh@linux01.gwdg.de>
Date: Sun, 21 Jan 2007 22:31:25 +0100 (MET)
Cc: sathesh babu <sathesh_edara2003@yahoo.co.in>, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
In-reply-to: <20070121001457.GA9123@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20070120234237.49126.qmail@web7912.mail.in.yahoo.com> <20070121001457.GA9123@linux-mips.org>
Sender: linux-mips-bounce@linux-mips.org
On Jan 21 2007 00:14, Ralf Baechle wrote:
>On Sat, Jan 20, 2007 at 11:42:37PM +0000, sathesh babu wrote:
>
>>   I am trying to run Linux-2.6.18.2 ( with preemption enable)
>>   kernel on FPGA board which has MIPS24KE processor runs at 12
>>   MHZ. Programmed the timer to give interrupt at every 10msec. I
>>   am seeing some inconsistence behavior during boot up processor.
>>   Some times it stops after "NET: Registered protocol family 17"
>>   and "VFS: Mounted root (jffs2 filesystem).". Could some give
>>   some pointers why the behavior is random. Is it OK to program
>>   the timer to 10 msec? or should it be more.
>
>The overhead of timer interrupts at this low clockrate is
>significant so I recommend to minimize the timer interrupt rate as
>far as possible. This is really a tradeoff between latency and
>overhead and matters much less on hardcores which run at hundreds of
>MHz.

Hm I've been running 2.6.13 on a 10/20 MHz (switchable) i386 @ 100 Hz
before without any hangs during boot or operation.


        -`J'
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