Date: Fri, 6 Sep 1996 22:50:07 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: gordon@drogon.net (Gordon Henderson) Cc: questions@freebsd.org, scsi@freebsd.org Subject: Re: CCD Setup woes ... (Kernel Panic) Message-ID: <199609070350.WAA02660@dyson.iquest.net> In-Reply-To: <Pine.LNX.3.91.960906150432.342A-100000@unicorn> from "Gordon Henderson" at Sep 6, 96 04:54:34 pm
next in thread | previous in thread | raw e-mail | index | archive | help
> > I'm tring to get a CCD going as an experiment and it's causing the kernel > to panic. > Yep, there is a problem with CCD using the FreeBSD bounce scheme. Of course, it is only noticed on ISA systems. > > which resulted in a kernel panic. The message is: > > vm_bounce_alloc: b_bufsize(0x80) < b_count(0x200) !! > panic: vm_bounce_alloc > b_bufsize is not being setup correctly in ccd (I think). > > followed by the usual syncing disks bit. The number in the b_bufsize() > varies from crash to crash. > > Am I doing anything obviously wrong? > No. Hope the following works for you!!! If it does, let me know so that I can commit it. Try this patch to ccd relative to -current (the equiv patch might work for -stable), I haven't tested this though: Index: ccd.c =================================================================== RCS file: /local/home/ncvs/src/sys/dev/ccd/ccd.c,v retrieving revision 1.16 diff -C5 -r1.16 ccd.c *** ccd.c 1996/07/24 23:45:24 1.16 --- ccd.c 1996/09/07 03:46:27 *************** *** 909,918 **** --- 909,920 ---- else cbp->cb_buf.b_bcount = dbtob(cs->sc_ileave - cboff); if (cbp->cb_buf.b_bcount > bcount) cbp->cb_buf.b_bcount = bcount; + cbp->cb_buf.b_bufsize = cbp->cb_buf.b_bcount; + /* * context for ccdiodone */ cbp->cb_obp = bp; cbp->cb_unit = cs - ccd_softc;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199609070350.WAA02660>