ide: remove stale comments from ide-dma.c (take 2)
- ide-dma.c is not a separate module - ide-dma.c is not PCI specific anymore - DMA is enabled by default nowadays - link for Intel Zappa BIOS is dead etc. v2: * Some comments should be preserved. (Noticed by Mark Lord) Cc: Mark Lord <liml@rtr.ca> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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@ -1,9 +1,13 @@
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/*
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* IDE DMA support (including IDE PCI BM-DMA).
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*
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* Copyright (C) 1995-1998 Mark Lord
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* Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
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* Copyright (C) 2004, 2007 Bartlomiej Zolnierkiewicz
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*
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* May be copied or modified under the terms of the GNU General Public License
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*
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* DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
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*/
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/*
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@ -11,49 +15,6 @@
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*/
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/*
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* This module provides support for the bus-master IDE DMA functions
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* of various PCI chipsets, including the Intel PIIX (i82371FB for
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* the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and
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* 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset)
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* ("PIIX" stands for "PCI ISA IDE Xcellerator").
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*
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* Pretty much the same code works for other IDE PCI bus-mastering chipsets.
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*
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* DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
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*
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* By default, DMA support is prepared for use, but is currently enabled only
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* for drives which already have DMA enabled (UltraDMA or mode 2 multi/single),
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* or which are recognized as "good" (see table below). Drives with only mode0
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* or mode1 (multi/single) DMA should also work with this chipset/driver
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* (eg. MC2112A) but are not enabled by default.
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*
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* Use "hdparm -i" to view modes supported by a given drive.
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*
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* The hdparm-3.5 (or later) utility can be used for manually enabling/disabling
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* DMA support, but must be (re-)compiled against this kernel version or later.
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*
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* To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
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* If problems arise, ide.c will disable DMA operation after a few retries.
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* This error recovery mechanism works and has been extremely well exercised.
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*
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* IDE drives, depending on their vintage, may support several different modes
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* of DMA operation. The boot-time modes are indicated with a "*" in
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* the "hdparm -i" listing, and can be changed with *knowledgeable* use of
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* the "hdparm -X" feature. There is seldom a need to do this, as drives
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* normally power-up with their "best" PIO/DMA modes enabled.
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*
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* Testing has been done with a rather extensive number of drives,
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* with Quantum & Western Digital models generally outperforming the pack,
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* and Fujitsu & Conner (and some Seagate which are really Conner) drives
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* showing more lackluster throughput.
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*
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* Keep an eye on /var/adm/messages for "DMA disabled" messages.
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*
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* Some people have reported trouble with Intel Zappa motherboards.
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* This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
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* available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
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* (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
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*
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* Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
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* fixing the problem with the BIOS on some Acer motherboards.
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*
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@ -65,11 +26,6 @@
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*
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* Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
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* for supplying a Promise UDMA board & WD UDMA drive for this work!
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*
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* And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
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*
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* ATA-66/100 and recovery functions, I forgot the rest......
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*
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*/
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#include <linux/module.h>
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