Merge branch 'delete-mca' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
Pull the MCA deletion branch from Paul Gortmaker:
"It was good that we could support MCA machines back in the day, but
realistically, nobody is using them anymore. They were mostly limited
to 386-sx 16MHz CPU and some 486 class machines and never more than
64MB of RAM. Even the enthusiast hobbyist community seems to have
dried up close to ten years ago, based on what you can find searching
various websites dedicated to the relatively short lived hardware.
So lets remove the support relating to CONFIG_MCA. There is no point
carrying this forward, wasting cycles doing routine maintenance on it;
wasting allyesconfig build time on validating it, wasting I/O on git
grep'ping over it, and so on."
Let's see if anybody screams. It generally has compiled, and James
Bottomley pointed out that there was a MCA extension from NCR that
allowed for up to 4GB of memory and PPro-class machines. So in *theory*
there may be users out there.
But even James (technically listed as a maintainer) doesn't actually
have a system, and while Alan Cox claims to have a machine in his cellar
that he offered to anybody who wants to take it off his hands, he didn't
argue for keeping MCA support either.
So we could bring it back. But somebody had better speak up and talk
about how they have actually been using said MCA hardware with modern
kernels for us to do that. And David already took the patch to delete
all the networking driver code (commit a5e371f61a: "drivers/net:
delete all code/drivers depending on CONFIG_MCA").
* 'delete-mca' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux:
MCA: delete all remaining traces of microchannel bus support.
scsi: delete the MCA specific drivers and driver code
serial: delete the MCA specific 8250 support.
arm: remove ability to select CONFIG_MCA
This commit is contained in:
Linus Torvalds
@@ -6,7 +6,7 @@
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# To add a new book the only step required is to add the book to the
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# list of DOCBOOKS.
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DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \
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DOCBOOKS := z8530book.xml device-drivers.xml \
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kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
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writing_usb_driver.xml networking.xml \
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kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \
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@@ -212,19 +212,6 @@ X!Edrivers/pci/hotplug.c
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<sect1><title>PCI Hotplug Support Library</title>
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!Edrivers/pci/hotplug/pci_hotplug_core.c
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</sect1>
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<sect1><title>MCA Architecture</title>
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<sect2><title>MCA Device Functions</title>
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<para>
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Refer to the file arch/x86/kernel/mca_32.c for more information.
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</para>
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<!-- FIXME: Removed for now since no structured comments in source
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X!Earch/x86/kernel/mca_32.c
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-->
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</sect2>
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<sect2><title>MCA Bus DMA</title>
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!Iarch/x86/include/asm/mca_dma.h
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</sect2>
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</sect1>
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</chapter>
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<chapter id="firmware">
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@@ -1,107 +0,0 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
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<book id="MCAGuide">
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<bookinfo>
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<title>MCA Driver Programming Interface</title>
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<authorgroup>
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<author>
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<firstname>Alan</firstname>
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<surname>Cox</surname>
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<affiliation>
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<address>
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<email>alan@lxorguk.ukuu.org.uk</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>David</firstname>
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<surname>Weinehall</surname>
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</author>
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<author>
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<firstname>Chris</firstname>
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<surname>Beauregard</surname>
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</author>
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</authorgroup>
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<copyright>
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<year>2000</year>
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<holder>Alan Cox</holder>
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<holder>David Weinehall</holder>
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<holder>Chris Beauregard</holder>
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</copyright>
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<legalnotice>
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<para>
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This documentation is free software; you can redistribute
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it and/or modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later
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version.
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</para>
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<para>
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This program is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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</para>
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<para>
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You should have received a copy of the GNU General Public
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License along with this program; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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MA 02111-1307 USA
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</para>
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<para>
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For more details see the file COPYING in the source
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distribution of Linux.
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</para>
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</legalnotice>
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</bookinfo>
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<toc></toc>
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<chapter id="intro">
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<title>Introduction</title>
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<para>
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The MCA bus functions provide a generalised interface to find MCA
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bus cards, to claim them for a driver, and to read and manipulate POS
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registers without being aware of the motherboard internals or
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certain deep magic specific to onboard devices.
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</para>
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<para>
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The basic interface to the MCA bus devices is the slot. Each slot
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is numbered and virtual slot numbers are assigned to the internal
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devices. Using a pci_dev as other busses do does not really make
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sense in the MCA context as the MCA bus resources require card
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specific interpretation.
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</para>
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<para>
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Finally the MCA bus functions provide a parallel set of DMA
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functions mimicing the ISA bus DMA functions as closely as possible,
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although also supporting the additional DMA functionality on the
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MCA bus controllers.
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</para>
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</chapter>
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<chapter id="bugs">
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<title>Known Bugs And Assumptions</title>
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<para>
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None.
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</para>
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</chapter>
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<chapter id="pubfunctions">
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<title>Public Functions Provided</title>
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!Edrivers/mca/mca-legacy.c
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</chapter>
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<chapter id="dmafunctions">
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<title>DMA Functions Provided</title>
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!Iarch/x86/include/asm/mca_dma.h
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</chapter>
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</book>
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Reference in New Issue
Block a user