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Date: Sat, 16 Nov 2002 09:23:41 -0700
From: yodaiken@fsmlabs.com
To: Stelian Pop <stelian.pop@fr.alcove.com>, Andrew Morton <akpm@digeo.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: lan based kgdb
Message-ID: <20021116092341.A30010@hq.fsmlabs.com>
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In-Reply-To: <20021115225932.GC1877@tahoe.alcove-fr>; from stelian.pop@fr.alcove.com on Fri, Nov 15, 2002 at 11:59:32PM +0100
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On Fri, Nov 15, 2002 at 11:59:32PM +0100, Stelian Pop wrote:
> On Fri, Nov 15, 2002 at 02:51:11PM -0800, Andrew Morton wrote:
> 
> > > Using USB instead of the serial line or the network card would be
> > > the best IMHO, because:
> > 
> > Here is the kgdb stub's "send a byte" function:
> > 
> > static void
> > write_char(int chr)
> > {
> >        while (!(inb(gdb_port + UART_LSR) & UART_LSR_THRE)) ;
> > 
> >        outb(chr, gdb_port + UART_TX);
> > }
> > 
> > Need I say more?
> 
> I already know that, but this is not the point. The point is that
> more and more boxes have no serial (or paralel) ports. 
> 
> But even on those boxes, sometimes I'd just love to be able to use
> kgdb. And I can't.
> 
> Ok, it will have to be at a higher level than the inb/outb serial
> transport implementation (with possible bad effects on what can
> and what cannot be debugged), but still, I feel there is a need
> for that.

> USB (with USB-to-serial adapter), network, ieee1394 would be 
> acceptable replacements for me.

Have you ever looked at a USB or 1394 driver? The nice thing about
serial is that the software to make it work is trivial. A debugger that 
relies on a 5000 line driver is quite suspect.

> 

> 
> Stelian.
> -- 
> Stelian Pop <stelian.pop@fr.alcove.com>
> Alcove - http://www.alcove.com
> -
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-- 
---------------------------------------------------------
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com  www.rtlinux.com
1+ 505 838 9109

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