Date: Mon, 4 Jul 2005 13:08:48 -0700 From: Marcel Moolenaar <marcel@xcllnt.net> To: Wilko Bulte <wb@freebie.xs4all.nl> Cc: Poul-Henning Kamp <phk@haven.freebsd.dk>, alpha@freebsd.org Subject: Re: GENERIC doesn't boot AlphaServer 1000 Message-ID: <8fe809bd5c24373ce1cd95c4fcdcea88@xcllnt.net> In-Reply-To: <20050704190131.GA49126@freebie.xs4all.nl> References: <27190.1120379420@phk.freebsd.dk> <20050704190131.GA49126@freebie.xs4all.nl>
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On Jul 4, 2005, at 12:01 PM, Wilko Bulte wrote: > DS10 on booting the latest SNAP CD I produced: > > Timecounter "i8254" frequency 1193182 Hz quality 0 > Timecounter "alpha" frequency 616519676 Hz quality 800 > Timecounters tick every 0.976 msec > Waiting 5 seconds for SCSI devices to settle > md0: Preloaded image </boot/mfsroot> 4423680 bytes at > 0xfffffc00009fb128 > acd0: CDROM <CD-224E/9.9A> at ata0-master PIO4 > ad0: 39093MB <FUJITSU MPG3409AH E C3C9> at ata1-master UDMA33 > da0 at isp0 bus 0 target 0 lun 0 > da0: <COMPAQ AD009322B9 3A07> Fixed Direct Access SCSI-2 device > da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing > Enabled > da0: 8678MB (17773500 512 byte sectors: 255H 63S/T 1106C) > > fatal kernel trap: > > trap entry = 0x4 (unaligned access fault) > cpuid = 0 > faulting va = 0xfffffc00010d7dc2 > opcode = 0x28 > register = 0x1 > pc = 0xfffffc00004c732c > ra = 0xfffffc00004c7598 > sp = 0xfffffe001a35dbd0 > curthread = 0xfffffc003eac1500 > pid = 2, comm = g_event > > [thread pid 2 tid 100003 ] > Stopped at is_pmbr+0x4c: and t0,#0xff,t0 > <t0=0xfffffc00010d7dbe> > db> The only alignment sensitive statement in is_pmbr() (in file geom_gpt.c) is a 16-bit load from an address that is guaranteed to be aligned by virtue of alignment guarantees of malloc(3) and kernel equivalents. The faulting VA is in fact sufficiently aligned for a 16-bit load. Could you post the assembly of is_pmbr(). It might be bad code. -- Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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