path: root/Documentation/ide
diff options
authorBartlomiej Zolnierkiewicz <>2008-04-27 15:38:30 +0200
committerBartlomiej Zolnierkiewicz <>2008-04-27 15:38:30 +0200
commit4706a7e03a03d6d206a93a49a0c723dd612cf8e9 (patch)
treeaa78320ae86d353d1cdbd818deb8e0ddeaf8893d /Documentation/ide
parent6e87543a94fb2a966c81a61fc91246592f9719da (diff)
ide: add "cdrom=" and "chs=" parameters
* Add "cdrom=" and "chs=" parameters. * Obsolete "hdx=cdrom" and "hdx=cyls,heads,sects" kernel parameters. Signed-off-by: Bartlomiej Zolnierkiewicz <>
Diffstat (limited to 'Documentation/ide')
1 files changed, 14 insertions, 17 deletions
diff --git a/Documentation/ide/ide.txt b/Documentation/ide/ide.txt
index 5bff93c89a23..caf24b21e7f5 100644
--- a/Documentation/ide/ide.txt
+++ b/Documentation/ide/ide.txt
@@ -82,17 +82,16 @@ Drives are normally found by auto-probing and/or examining the CMOS/BIOS data.
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
-or hdx=cdrom
+ ide_core.chs=[interface_number.device_number]:cyls,heads,sects
+or ide_core.cdrom=[interface_number.device_number]
-where hdx can be any of hda through hdh, Three values are required
-(cyls,heads,sects). For example:
+For example:
- hdc=1050,32,64 hdd=cdrom
+ ide_core.chs=1.0:1050,32,64 ide_core.cdrom=1.1
-either {hda,hdb} or {hdc,hdd}. The results of successful auto-probing may
-override the physical geometry/irq specified, though the "original" geometry
-may be retained as the "logical" geometry for partitioning purposes (fdisk).
+The results of successful auto-probing may override the physical geometry/irq
+specified, though the "original" geometry may be retained as the "logical"
+geometry for partitioning purposes (fdisk).
If the auto-probing during boot time confuses a drive (ie. the drive works
with hd.c but not with ide.c), then an command line option may be specified
@@ -101,7 +100,7 @@ probe/identification sequence. For example:
- hdc=768,16,32
+ ide_core.chs=1.0:768,16,32
Note that when only one IDE device is attached to an interface, it should be
@@ -118,9 +117,9 @@ If for some reason your cdrom drive is *not* found at boot time, you can force
the probe to look harder by supplying a kernel command line parameter
via LILO, such as:
- hdc=cdrom /* hdc = "master" on second interface */
+ ide_core.cdrom=1.0 /* "master" on second interface (hdc) */
- hdd=cdrom /* hdd = "slave" on second interface */
+ ide_core.cdrom=1.1 /* "slave" on second interface (hdd) */
For example, a GW2000 system might have a hard drive on the primary
interface (/dev/hda) and an IDE cdrom drive on the secondary interface
@@ -182,12 +181,6 @@ driver using the "options=" keyword to insmod, while replacing any ',' with
Summary of ide driver parameters for kernel command line
- "hdx=" is recognized for all "x" from "a" to "u", such as "hdc".
- "hdx=cdrom" : drive is present, and is a cdrom drive
- "hdx=cyl,head,sect" : disk drive is present, with specified geometry
"ide=doubler" : probe/support IDE doublers on Amiga
There may be more options than shown -- use the source, Luke!
@@ -230,6 +223,10 @@ Other kernel parameters for ide_core are:
* "nowerr=[interface_number.device_number]" to ignore the WRERR_STAT bit
+* "cdrom=[interface_number.device_number]" to force device as a CD-ROM
+* "chs=[interface_number.device_number]" to force device as a disk (using CHS)
Some Terminology