Date: Mon, 25 Aug 2014 11:20:18 +0100 From: Andrew Turner <andrew@fubar.geek.nz> To: Ian Lepore <ian@FreeBSD.org> Cc: Tom Everett <tom@0x544745.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: wandboard SMP panic Message-ID: <20140825112018.36988c28@bender.lan> In-Reply-To: <1408896148.1150.62.camel@revolution.hippie.lan> References: <53F93895.6060905@0x544745.com> <20140824110530.042dfecf@bender.lan> <1408896148.1150.62.camel@revolution.hippie.lan>
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On Sun, 24 Aug 2014 10:02:28 -0600 Ian Lepore <ian@FreeBSD.org> wrote: > On Sun, 2014-08-24 at 11:05 +0100, Andrew Turner wrote: > > On Sat, 23 Aug 2014 18:57:57 -0600 > > Tom Everett <tom@0x544745.com> wrote: > > > > > > > > Hello everyone. I am seeing a new panic booting Wandboard: > > > > > > Loaded DTB from file 'wandboard-quad.dtb'. > > > > > > > > > Kernel entry at 0x12000100... > > > > > > > > > Kernel args: (null) > > > > > > > > > KDB: debugger backends: ddb > > > KDB: current backend: ddb > > > Copyright (c) 1992-2014 The FreeBSD Project. > > > Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, > > > 1993, 1994 The Regents of the University of California. All > > > rights reserved. FreeBSD is a registered trademark of The FreeBSD > > > Foundation. FreeBSD 11.0-CURRENT #0 r270430M: Sat Aug 23 17:24:21 > > > MDT 2014 > > > tom@bernice:/storage/home/tom/crochet/crochet-freebsd/work/obj/arm.armv6/storage/home/tom/crochet/src/FreeBSDHead/head/sys/IMX6 > > > arm > > > FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) > > > 20140512 CPU: Cortex A9-r2 rev 10 (Cortex-A core) > > > Supported features: ARM_ISA THUMB2 JAZELLE THUMBEE ARMv4 > > > Security_Ext WB disabled EABT branch prediction enabled > > > LoUU:2 LoC:1 LoUIS:2 > > > Cache level 1: > > > 32KB/32B 4-way data cache WB Read-Alloc Write-Alloc > > > 32KB/32B 4-way instruction cache Read-Alloc > > > real memory = 2147483648 (2048 MB) > > > avail memory = 2093891584 (1996 MB) > > > WARNING: Some AP's failed to start > > > FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs > > > random device not loaded; using insecure entropy > > > panic: Built bad topology at 0xc2510fb4. CPU mask (f) != (1) > > > cpuid = 0 > > > KDB: enter: panic > > > [ thread pid 0 tid 100000 ] > > > Stopped at $d: ldrb r15, [r15, r15, ror r15]! > > > db> > > > > I had a similar problem. It turned out to be a caching issue in > > U-Boot. It appears to not correctly flush the dcache. You can try > > to run "dcache off ; dcache flush" before entering ubldr. If this > > fails you will need to build a version of U-Boot with the dcache > > disabled. > > > > Andrew > > That's interesting... how are y'all launching ubldr, with a 'go' > command? It's been my experience that the bootelf and bootm commands > manage the cache correctly, but go doesn't. You can launch ubldr with > bootelf (it has proper elf headers) but you can't launch the kernel > directly that way. But the stock u-boot might not have bootelf. This was with the bootelf command. I never tracked down why it was failing to flush the cache correctly and in the end disabled it. Andrew
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