MESH SCSI driver not working
From: Pol Vangheluwe <hidden>
Date: 2011-08-04 19:40:50
On Fri, 2010-03-19 at 00:21 +0100, Stef Simoens wrote:
Hello, Some time ago (July 24th 2009 my mailbox says) I emailed you and the linuxppc-dev list about my problems booting from the mesh SCSI controller. I just compiled 2.6.31 (actually, gentoo-sources-2.6.31-r10); but the problem remains I know that 2.6.33 is out, but as I didn't see any changes to the mesh-driver I guess that the problem is still there ...
Sadly I haven't had a chance to look. The MESH driver is a pretty complicated thing that I didn't write and am not familiar with, so it's going to take some work to sort out what's going on, and so far I haven't had time to dedicate to this. Cheers, Ben. I found this topic in the linuxppc-dev archives while googling for a mesh problem I currently have on my PowerPC 7500: the boot process fails when populating /dev. I think I have the same problem as reported by Stef Simoens: after a lot of complaints like 'mesh_abort' and 'mesh_host_reset', it ends with Kernel panic about 'double DMA start'. A rebuilt my kernel several times with different configs, but the only way to make it bootable is to disable the CDROM driver (the 'sr' block of the SCSI upper layer). The problem even occurs when 'sr' is built as a module. My platform: pol [ ~ ]$ cat /proc/cpuinfo processor : 0 cpu : 604e clock : 200.000000MHz revision : 2.4 (pvr 0009 0204) bogomips : 25.00 timebase : 12500550 platform : PowerMac model : Power Macintosh machine : Power Macintosh motherboard : AAPL,7500 MacRISC detected as : 16 (PowerMac 7500) pmac flags : 00000000 L2 cache : 256K unified pmac-generation : OldWorld Memory : 208 MB My kernel: pol [ ~ ]$ uname -a Linux ppc7600 2.6.37.6 #4 Thu Aug 4 18:36:07 CEST 2011 ppc GNU/Linux My compiler: pol [ ~ ]$ gcc -v Ingebouwde specs worden gebruikt. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/powerpc-unknown-linux-gnu/4.5.2/lto-wrapper Target: powerpc-unknown-linux-gnu Configured with: ../gcc-4.5.2/configure --prefix=/usr --libexecdir=/usr/lib --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-languages=c,c++ --disable-multilib --disable-bootstrap --with-system-zlib Thread model: posix gcc versie 4.5.2 (GCC) My system: LFS-2.8 (Linux From Scratch) I have on the same machine also Ubuntu 8.04.1 (hardy), running the 2.6.24-19-powerpc kernel and gcc 4.1.3. There is no mesh problem with this distribution. Stef reported kernel 2.6.29 OK but 2.6.30-rcl and 2.6.31-rc3 NOK. I recompiled mesh.c with DEBUG on and I see a lot of messages on the screen but I cannot capture them in a file. We are too early in the boot process for a working serial port and there is no disk mounted yet to log anything. BenH was suspecting a DMA buffer misalignment but so far, I could not find a real solution on the Internet. Anybody? pvg