ones), for the drives/geometries attached to those interfaces, and for the IRQ
lines being used by the interfaces (normally 14, 15 for ide0/ide1).
-For special cases, interfaces may be specified using kernel "command line"
-options. For example,
-
- ide3=0x168,0x36e,10 /* ioports 0x168-0x16f,0x36e, irq 10 */
-
-Normally the irq number need not be specified, as ide.c will probe for it:
-
- ide3=0x168,0x36e /* ioports 0x168-0x16f,0x36e */
-
-The standard port, and irq values are these:
-
- ide0=0x1f0,0x3f6,14
- ide1=0x170,0x376,15
- ide2=0x1e8,0x3ee,11
- ide3=0x168,0x36e,10
-
-Note that the first parameter reserves 8 contiguous ioports, whereas the
-second value denotes a single ioport. If in doubt, do a 'cat /proc/ioports'.
-
-In all probability the device uses these ports and IRQs if it is attached
-to the appropriate ide channel. Pass the parameter for the correct ide
-channel to the kernel, as explained above.
-
Any number of interfaces may share a single IRQ if necessary, at a slight
performance penalty, whether on separate cards or a single VLB card.
The IDE driver automatically detects and handles this. However, this may
For really weird situations, the apparent (fdisk) geometry can also be specified
on the kernel "command line" using LILO. The format of such lines is:
- hdx=cyls,heads,sects,wpcom,irq
+ hdx=cyls,heads,sects
or hdx=cdrom
where hdx can be any of hda through hdh, Three values are required
Please pass on any feedback on any of this stuff to the maintainer,
whose address can be found in linux/MAINTAINERS.
-Note that if BOTH hd.c and ide.c are configured into the kernel,
-hd.c will normally be allowed to control the primary IDE interface.
-This is useful for older hardware that may be incompatible with ide.c,
-and still allows newer hardware to run on the 2nd/3rd/4th IDE ports
-under control of ide.c. To have ide.c also "take over" the primary
-IDE port in this situation, use the "command line" parameter: ide0=0x1f0
-
The IDE driver is modularized. The high level disk/CD-ROM/tape/floppy
drivers can always be compiled as loadable modules, the chipset drivers
can only be compiled into the kernel, and the core code (ide.c) can be
driver using the "options=" keyword to insmod, while replacing any ',' with
';'. For example:
- insmod ide.o options="ide0=serialize ide1=serialize ide2=0x1e8;0x3ee;11"
+ insmod ide.o options="hda=nodma hdb=nodma"
================================================================================
Summary of ide driver parameters for kernel command line
--------------------------------------------------------
- "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
+ "hdx=" is recognized for all "x" from "a" to "u", such as "hdc".
- "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
+ "idex=" is recognized for all "x" from "0" to "9", such as "ide1".
"hdx=noprobe" : drive may be present, but do not probe for it
"hdx=cyl,head,sect" : disk drive is present, with specified geometry
- "hdx=remap" : remap access of sector 0 to sector 1 (for EZDrive)
-
- "hdx=remap63" : remap the drive: add 63 to all sector numbers
- (for DM OnTrack)
-
- "idex=noautotune" : driver will NOT attempt to tune interface speed
-
"hdx=autotune" : driver will attempt to tune interface speed
to the fastest PIO mode supported,
if possible for this drive only.
"hdx=nodma" : disallow DMA
- "hdx=scsi" : the return of the ide-scsi flag, this is useful for
- allowing ide-floppy, ide-tape, and ide-cdrom|writers
- to use ide-scsi emulation on a device specific option.
-
"idebus=xx" : inform IDE driver of VESA/PCI bus speed in MHz,
where "xx" is between 20 and 66 inclusive,
used when tuning chipset PIO modes.
As for VLB, it is safest to not specify it.
Bigger values are safer than smaller ones.
- "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=serialize" : do not overlap operations on idex. Please note
that you will have to specify this option for
both the respective primary and secondary channel
to take effect.
- "idex=four" : four drives on idex and ide(x^1) share same ports
-
"idex=reset" : reset interface after probe
- "idex=ata66" : informs the interface that it has an 80c cable
- for chipsets that are ATA-66 capable, but the
- ability to bit test for detection is currently
- unknown.
-
- "ide=reverse" : formerly called to pci sub-system, but now local.
-
-The following are valid ONLY on ide0, which usually corresponds
-to the first ATA interface found on the particular host, and the defaults for
-the base,ctl ports must not be altered.
-
"ide=doubler" : probe/support IDE doublers on Amiga
There may be more options than shown -- use the source, Luke!
kernel paremeter to enable probing for VLB version of the chipset (PCI ones
are detected automatically).
+You also need to use "probe" kernel parameter for ide-4drives driver
+(support for IDE generic chipset with four drives on one port).
+
+To force ignoring cable detection (this should be needed only if you're using
+short 40-wires cable which cannot be automatically detected - if this is not
+a case please report it as a bug instead) use "ignore_cable" kernel parameter:
+
+* "ide_core.ignore_cable=[interface_number]" boot option if IDE is built-in
+ (i.e. "ide_core.ignore_cable=1" to force ignoring cable for "ide1")
+
+* "ignore_cable=[interface_number]" module parameter (for ide_core module)
+ if IDE is compiled as module
+
================================================================================
Some Terminology
projects / firefly-linux-kernel-4.4.55.git / blobdiff