From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dale Larson Date: Fri, 11 Sep 2009 18:06:31 +0000 Subject: User mode address error problems on 7763 Message-Id: <6e6aa1a80909111106l6dbcfccag4e9e7a3abb922688@mail.gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sh@vger.kernel.org I've been porting linux (2.6.30.2) to our 7763 based platform and the kernel seems to be running fine but when user mode programs run I randomly get errors like this: [ 8.419557] VFS: Mounted root (nfs filesystem) on device 0:9. [ 8.431863] Freeing unused kernel memory: 80k freed init started: BusyBox v1.14.3 (2009-09-04 15:19:48 CDT) [ 8.682286] Fixing up unaligned userspace access in "mount" pid2 pc=0x295583d0 ins=0x60b2 [ 8.699336] Sending SIGBUS to "mount" due to unaligned access (PC a0042955 PR 295583da) Populating /dev using udev: done Another example: Starting dropbear sshd: OK [ 484.428550] Fixing up unaligned userspace access in "touch" pid8 pc=0x295583d0 ins=0x60b2 [ 492.438796] Sending SIGBUS to "touch" due to unaligned access (PC a0042955 PR 295583da) The SIGBUS kills the process. I've tried various versions of linux form kernel.org: 2.6.28, 2.6.29, 2.6.30 and all have the same behaviour. Using JTAG I see that I'm having both data alignment and PC alignment problems. If I turn off the I&D caching this problem doesn't happen. It almost seems like some loader code is loading programs on bad addresses. I'm building the system using BuildRoot and the cross compiler I'm using is version 4.3.4 of the GNU compiler and 2.19.1 of binutils. Can anyone give a clue as to what rabbit holes I need to look down? Dale Larson Johnson Controls, Inc