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Re: port-vax/49517: si driver has DMA problems
That depends on the hardware. A VS2K for example have 16k.
The MV3100 has 128k DMA space. It is actually a separate block of memory
(not in normal RAM) from where the data later must be copied to its
David Brownlee skrev den 2015-01-20 17:30:
The following reply was made to PR port-vax/49517; it has been noted by GNATS.
From: David Brownlee <abs%absd.org@localhost>
To: "gnats-bugs%netbsd.org@localhost" <gnats-bugs%netbsd.org@localhost>
"gnats-admin%netbsd.org@localhost" <gnats-admin%netbsd.org@localhost>, netbsd-bugs%netbsd.org@localhost,
port-vax List <port-vax%netbsd.org@localhost>
Subject: Re: port-vax/49517: si driver has DMA problems
Date: Tue, 20 Jan 2015 16:28:05 +0000
Just a random thought, could this is be related to trying a MAXPHYS
(64K) sized transfer? I seem to recall something related to the vax
NCR5380 having a less than 64K max transfer size limit...
On 30 December 2014 at 21:10, <martin%netbsd.org@localhost> wrote:
>>Synopsis: si driver has DMA problems
>>Arrival-Date: Tue Dec 30 21:10:00 +0000 2014
>>Originator: Martin Husemann
>>Release: NetBSD 7.99.2
> The NetBSD Foundation, Inc.
> System: NetBSD 7.99.3 NetBSD 7.99.3 (GENERIC) #8: Tue Dec 30 19:18:41 CET 2014 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/usr/obj/vax/usr/src/sys/arch/vax/compile/GENERIC vax
> Architecture: vax
> Machine: vax
> The NCR5380 driver seems to corrupt kernel memory on incoming (i.e. read)
> transfers basically imediately. Random things happen (programs die, ...)
> after a few transfers.
> Forcing all IN operations to do PIO makes the system pretty much stable:
> Index: ncr.c
> RCS file: /cvsroot/src/sys/arch/vax/vsa/ncr.c,v
> retrieving revision 1.48
> diff -u -r1.48 ncr.c
> --- ncr.c 14 Dec 2010 23:31:16 -0000 1.48
> +++ ncr.c 30 Dec 2014 21:01:29 -0000
> @@ -254,6 +254,9 @@
> if (sr->sr_flags & SR_IMMED)
> + if (!(xs->xs_control & XS_CTL_DATA_OUT))
> + return;
> xlen = ncr_sc->sc_datalen;
> /* Make sure our caller checked sc_min_dma_len. */
> Try to install on a MicroVax 3100 to a scsi disk.
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