From mboxrd@z Thu Jan 1 00:00:00 1970 From: jbarnes@sgi.com (Jesse Barnes) Date: Wed, 03 Mar 2004 17:27:09 +0000 Subject: Re: Fix staircase effect on Altix serial console. Message-Id: <20040303172708.GE2026@sgi.com> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Wed, Mar 03, 2004 at 09:19:37AM -0800, Jesse Barnes wrote: > On Wed, Mar 03, 2004 at 11:57:21AM +0100, Andreas Schwab wrote: > > The system controller should not change the output in any way. It's the > > job of the serial console write function (which is used for printk) to > > Right, but I think our L2 system controller *does* molest the output > (and the 2.6 console driver relies on this behavior). I've filed a bug > with our system controller group to make the behavior of the L2 and L1 > system controllers consistent (I believe you're using an L1), which I > think is the proper fix. In case I wasn't clear: I think your patch would be ok for systems that use L1s, but would result in extra CRs for systems using L2s as their console, so we really need to fix the system controllers instead. Thanks, Jesse