163 lines
6.3 KiB
HTML
163 lines
6.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
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<TITLE>The Linux BootPrompt-HowTo: Hard Disks</TITLE>
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<LINK HREF="BootPrompt-HOWTO-8.html" REL=next>
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<LINK HREF="BootPrompt-HOWTO-6.html" REL=previous>
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<LINK HREF="BootPrompt-HOWTO.html#toc7" REL=contents>
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</HEAD>
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<BODY>
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<A HREF="BootPrompt-HOWTO-8.html">Next</A>
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<A HREF="BootPrompt-HOWTO-6.html">Previous</A>
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<A HREF="BootPrompt-HOWTO.html#toc7">Contents</A>
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<HR>
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<H2><A NAME="s7">7. Hard Disks</A></H2>
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<P>This section lists all the boot args associated with standard
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MFM/RLL, ST-506, XT, and IDE disk drive devices.
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Note that both the IDE and the generic ST-506 HD driver
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both accept the `hd=' option.
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<P>
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<H2><A NAME="ss7.1">7.1 IDE Disk/CD-ROM Driver Parameters</A>
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</H2>
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<P>The IDE driver accepts a number of parameters, which range
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from disk geometry specifications, to support for advanced or
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broken controller chips. The following is a summary of
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some of the more common boot arguments. For full details, you
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<EM>really</EM> should consult the file <CODE>ide.txt</CODE> in the
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<CODE>linux/Documentation</CODE> directory, from which this
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summary was extracted.
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<P>
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<HR>
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<PRE>
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"hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
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"idex=" is recognized for all "x" from "0" to "3", such as "ide1".
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"hdx=noprobe" : drive may be present, but do not probe for it
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"hdx=none" : drive is NOT present, ignore cmos and do not probe
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"hdx=nowerr" : ignore the WRERR_STAT bit on this drive
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"hdx=cdrom" : drive is present, and is a cdrom drive
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"hdx=cyl,head,sect" : disk drive is present, with specified geometry
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"hdx=autotune" : driver will attempt to tune interface speed
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to the fastest PIO mode supported,
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if possible for this drive only.
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Not fully supported by all chipset types,
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and quite likely to cause trouble with
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older/odd IDE drives.
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"idex=noprobe" : do not attempt to access/use this interface
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"idex=base" : probe for an interface at the addr specified,
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where "base" is usually 0x1f0 or 0x170
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and "ctl" is assumed to be "base"+0x206
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"idex=base,ctl" : specify both base and ctl
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"idex=base,ctl,irq" : specify base, ctl, and irq number
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"idex=autotune" : driver will attempt to tune interface speed
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to the fastest PIO mode supported,
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for all drives on this interface.
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Not fully supported by all chipset types,
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and quite likely to cause trouble with
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older/odd IDE drives.
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"idex=noautotune" : driver will NOT attempt to tune interface speed
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This is the default for most chipsets,
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except the cmd640.
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"idex=serialize" : do not overlap operations on idex and ide(x^1)
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</PRE>
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<HR>
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<P>The following are valid ONLY on ide0,
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and the defaults for the base,ctl ports must not be altered.
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<P>
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<HR>
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<PRE>
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"ide0=dtc2278" : probe/support DTC2278 interface
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"ide0=ht6560b" : probe/support HT6560B interface
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"ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
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(not for PCI -- automatically detected)
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"ide0=qd6580" : probe/support qd6580 interface
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"ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439/M1445)
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"ide0=umc8672" : probe/support umc8672 chipsets
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</PRE>
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<HR>
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<P>During the install of some PCMCIA systems, you may be able
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to get detection of your CD-ROM by using:
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<HR>
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<PRE>
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"ide2=0x180,0x386" : probe typical PCMCIA IDE interface location
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</PRE>
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<HR>
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<P>Everything else is rejected with a "BAD OPTION" message.
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Also note that there is an implied <CODE>ide0=0x1f0 ide1=0x170</CODE>
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in the absence of any other ide boot args.
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<P>
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<H2><A NAME="ss7.2">7.2 Old MFM/RLL/Standard ST-506 Disk Driver Options (`hd=')</A>
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</H2>
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<P>The standard disk driver can accept geometry arguments for
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the disks similar to the IDE driver. Note however that it
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only expects three values (C/H/S) -- any more or any less
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and it will silently ignore you. Also, it only accepts
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`hd=' as an argument, i.e. `hda=', `hdb=' and so on are
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not valid here. The format is as follows:
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<P>
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<HR>
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<PRE>
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hd=cyls,heads,sects
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</PRE>
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<HR>
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<P>If there are two disks installed, the above is repeated
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with the geometry parameters of the second disk.
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<P>
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<H2><A NAME="ss7.3">7.3 XT Disk Driver Options (`xd=', `xd_geo=')</A>
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</H2>
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<P>If you are unfortunate enough to be using one of these old
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8 bit cards that move data at a whopping 125kB/s then here
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is the scoop. The probe code for these cards looks for an installed
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BIOS, and if none is present, the probe will not find your card. Or,
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if the signature string of your BIOS is not recognized then it
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will also not be found. In either case, you will then have to use a
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boot argument of the form:
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<P>
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<HR>
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<PRE>
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xd=type,irq,iobase,dma_chan
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</PRE>
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<HR>
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<P>The <CODE>type</CODE> value specifies the particular manufacturer of the
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card, and are as follows: 0=generic; 1=DTC; 2,3,4=Western Digital,
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5,6,7=Seagate; 8=OMTI. The only difference between multiple types
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from the same manufacturer is the BIOS string used for detection,
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which is not used if the type is specified.
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<P>The <CODE>xd_setup()</CODE> function does no checking on the values, and
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assumes that you entered all four values. Don't disappoint it.
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Here is an example usage for a WD1002 controller with the BIOS
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disabled/removed, using the `default' XT controller parameters:
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<P>
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<HR>
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<PRE>
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xd=2,5,0x320,3
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</PRE>
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<HR>
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<P>If the disk geometry that the kernel prints out comes out all
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wrong to what you know the disk is set up as, you can override
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that as well, with:
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<P>
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<HR>
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<PRE>
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xd_geo=cyl_xda,head_xda,sec_xda
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</PRE>
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<HR>
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<P>Add another comma and another three CHS values if you are
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silly enough to have two disks on the old hunk of scrap...
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<P>
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<HR>
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<A HREF="BootPrompt-HOWTO-8.html">Next</A>
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<A HREF="BootPrompt-HOWTO-6.html">Previous</A>
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<A HREF="BootPrompt-HOWTO.html#toc7">Contents</A>
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</HTML>
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