From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3911A489.F4A255F6@embeddededge.com> Date: Thu, 04 May 2000 12:25:45 -0400 From: Dan Malek MIME-Version: 1.0 To: Kim Jørgensen CC: "'linuxppc-embedded@lists.linuxppc.org'" Subject: Re: Problem with MPC823 LCD driver References: <819E3E914E0AD11194DE00805F0D100B0138B852@fbi.infocom.dk> Content-Type: text/plain; charset=iso-8859-1 Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Kim Jørgensen wrote: > I got a custom MPC823E board, and I want to use a LCD display with Linux. Get the logic analyzer on the bus....... > Can anyone tell me what is wrong, and how to solve this? I can make a few guesses. This has nothing to do with Math Emulation, and everything to do with fetching the proper instructions into the core. The LCD controller is a heavy-duty DMA controller that has priority over everything to ensure it can keep the display updated from system memory. Since the controller performs large burst mode operations, this is a classic example of memory controller or memory interface problems. I suspect the memory timing isn't correct and the instructions are just bad memory cycles that can't be properly decoded. -- Dan ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/