Specifications

wd7000= Western Digital WD7000 cards
7. Hard Disks
This section lists all the boot args associated with standard MFM/RLL, ST−506, XT, and IDE disk drive
devices. Note that both the IDE and the generic ST−506 HD driver both accept the `hd=' option.
7.1 IDE Disk/CD−ROM Driver Parameters
The IDE driver accepts a number of parameters, which range from disk geometry specifications, to support for
advanced or broken controller chips. The following is a summary of some of the more common boot
arguments. For full details, you really should consult the file ide.txt in the linux/Documentation
directory, from which this summary was extracted.
"hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
"idex=" is recognized for all "x" from "0" to "3", such as "ide1".
"hdx=noprobe" : drive may be present, but do not probe for it
"hdx=none" : drive is NOT present, ignore cmos and do not probe
"hdx=nowerr" : ignore the WRERR_STAT bit on this drive
"hdx=cdrom" : drive is present, and is a cdrom drive
"hdx=cyl,head,sect" : disk drive is present, with specified geometry
"hdx=autotune" : driver will attempt to tune interface speed
to the fastest PIO mode supported,
if possible for this drive only.
Not fully supported by all chipset types,
and quite likely to cause trouble with
older/odd IDE drives.
"idex=noprobe" : do not attempt to access/use this interface
"idex=base" : probe for an interface at the addr specified,
where "base" is usually 0x1f0 or 0x170
and "ctl" is assumed to be "base"+0x206
"idex=base,ctl" : specify both base and ctl
"idex=base,ctl,irq" : specify base, ctl, and irq number
"idex=autotune" : driver will attempt to tune interface speed
to the fastest PIO mode supported,
for all drives on this interface.
Not fully supported by all chipset types,
and quite likely to cause trouble with
older/odd IDE drives.
"idex=noautotune" : driver will NOT attempt to tune interface speed
This is the default for most chipsets,
except the cmd640.
"idex=serialize" : do not overlap operations on idex and ide(x^1)
The following are valid ONLY on ide0, and the defaults for the base,ctl ports must not be altered.
"ide0=dtc2278" : probe/support DTC2278 interface
"ide0=ht6560b" : probe/support HT6560B interface
"ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
(not for PCI −− automatically detected)
"ide0=qd6580" : probe/support qd6580 interface
"ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439/M1445)
The Linux BootPrompt−HowTo
7. Hard Disks 23