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Subject: Re: lan based kgdb
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andrew Morton <akpm@digeo.com>
Cc: Stelian Pop <stelian.pop@fr.alcove.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 16 Nov 2002 02:35:03 +0000
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On Fri, 2002-11-15 at 22:51, Andrew Morton wrote:
> Stelian Pop wrote:
> > 
> > On Fri, Nov 15, 2002 at 09:26:00PM +0000, Linus Torvalds wrote:
> > 
> > > I dunno. I might even be willing to apply kgdb patches to my tree if it
> > > just could use the regular network card I already have connected on all
> > > my machines. None of my laptops have a serial line, for example, but
> > > they all have networking.
> > >
> > > Soon even _desktops_ probably won't have serial lines any more, only USB.
> > 
> > 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?


netdump has polled eepro100 handlers that will plug nicely into this. Of
course you still want a protocol on top of it, but there are some tiny
tcp implementations that are GPL (eg the Linux 8086 TCP by Harry K)

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