Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support

From	Geert Uytterhoeven <geert@linux-m68k.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support
Date	2017-01-26 10:10 +0100
Message-ID	<t3Oe6-5t5-13@gated-at.bofh.it> (permalink)
References	(9 earlier) <sZKVr-6yh-1@gated-at.bofh.it> <t1C7n-4pX-15@gated-at.bofh.it> <t1Yrg-1gy-19@gated-at.bofh.it> <t2HRo-3Xz-21@gated-at.bofh.it> <t3NUJ-57D-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Finn,

On Thu, Jan 26, 2017 at 9:47 AM, Finn Thain <fthain@telegraphics.com.au> wrote:
> The difficulty will be arranging for disabled FDC & IDE interrupt sources
> during SCSI DMA, and disabled SCSI & IDE interrupt sources during FDC DMA.
> (Not all 5380 interrupts can be disabled; no idea about the IDE device or
> WD1772 FDC.)

IDE interrupts are disabled at the device level.
Unfortunately some hard drives (e.g. Western Digital Caviar) didn't honour
the ATA disable IRQ bit, so they caused an interrupt deadlock if you probed
for them on Amiga with the IDE interrupt enabled. The problem didn't show
up on PC because they had no shared interrupts, while on A4000 the IDE
interrupt is shared with Zorro Ethernet, which was still enabled.

That was fixed (in 1995 or 1996?) by disabling the IDE interrupt at the
IRQ controller level.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Thread

Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Michael Schmitz <schmitzmic@gmail.com> - 2017-01-20 08:50 +0100
  Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Finn Thain <fthain@telegraphics.com.au> - 2017-01-21 08:40 +0100
    Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Michael Schmitz <schmitzmic@gmail.com> - 2017-01-23 09:10 +0100
      Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Finn Thain <fthain@telegraphics.com.au> - 2017-01-26 09:50 +0100
        Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Geert Uytterhoeven <geert@linux-m68k.org> - 2017-01-26 10:10 +0100
          Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Finn Thain <fthain@telegraphics.com.au> - 2017-01-27 03:00 +0100
        Re: [PATCH 0/3] ata: add m68k/Atari Falcon PATA support Michael Schmitz <schmitzmic@gmail.com> - 2017-01-27 05:30 +0100

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