From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <37FEA5CA.57808DB3@mvista.com> Date: Fri, 08 Oct 1999 21:17:47 -0500 From: Jim Lewis MIME-Version: 1.0 To: linuxppc-embedded Subject: Strange behavior on FADS with ICTRL==0 Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Hello, I am working with 2.2.5 on a FADS 823. If the ISCT_SER field of the ICTRL register is set to 0 (which is the value on reset), the system is very unstable. This field controls whether the core is serialized and provides options for placing instruction fetches from cache on the external pins for tracing and debugging purposes. Mainly, I get one of two errors after init has started: Panic: Kernel Mode Software FPU Emulation page fault in interrupt handler When ISCT_SER is set to 0, the core is fully serialized and all instruction fetches are shown. On the other hand, if I set the ISCT_SER to 7 (the recommended "production" value), the core is not serialized and no fetches are shown. The system is stable with this setting. Has anyone else experienced anything like this? Thanks -- Jim Lewis Sr. Field Applications Engineer MontaVista Software, Inc. (817)261-9088 http://www.mvista.com ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/