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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 <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-04-27 15:38:30 +02:00
parent 6e87543a94
commit 4706a7e03a
2 changed files with 80 additions and 22 deletions
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31
Documentation/ide/ide.txt
View File

@ -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:
ide_core.noprobe=0.1
or
hdc=768,16,32
ide_core.chs=1.0:768,16,32
ide_core.noprobe=1.0
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) */
or
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

71
drivers/ide/ide.c
View File

@ -924,7 +924,7 @@ static int __init ide_setup(char *s)
drive->media = ide_cdrom;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
goto done;
goto obsolete_option;
case -5: /* nodma */
drive->nodma = 1;
goto obsolete_option;
@ -948,7 +948,7 @@ static int __init ide_setup(char *s)
drive->sect = drive->bios_sect = vals[2];
drive->present = 1;
drive->forced_geom = 1;
goto done;
goto obsolete_option;
default:
goto bad_option;
}
@ -975,9 +975,6 @@ bad_option:
obsolete_option:
printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
return 1;
done:
printk("\n");
return 1;
}
EXPORT_SYMBOL(ide_lock);
@ -1167,6 +1164,51 @@ static unsigned int ide_nowerr;
module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
static unsigned int ide_cdroms;
module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
struct chs_geom {
unsigned int cyl;
u8 head;
u8 sect;
};
static unsigned int ide_disks;
static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
{
int a, b, c = 0, h = 0, s = 0, i, j = 1;
if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
return -EINVAL;
if (c > INT_MAX || h > 255 || s > 255)
return -EINVAL;
if (j)
ide_disks |= (1 << i);
else
ide_disks &= (1 << i);
ide_disks_chs[i].cyl = c;
ide_disks_chs[i].head = h;
ide_disks_chs[i].sect = s;
return 0;
}
module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
static void ide_dev_apply_params(ide_drive_t *drive)
{
int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
@ -1189,6 +1231,25 @@ static void ide_dev_apply_params(ide_drive_t *drive)
drive->name);
drive->bad_wstat = BAD_R_STAT;
}
if (ide_cdroms & (1 << i)) {
printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
drive->present = 1;
drive->media = ide_cdrom;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
}
if (ide_disks & (1 << i)) {
drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
drive->head = drive->bios_head = ide_disks_chs[i].head;
drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
drive->forced_geom = 1;
printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
drive->name,
drive->cyl, drive->head, drive->sect);
drive->present = 1;
drive->media = ide_disk;
drive->ready_stat = READY_STAT;
}
}
static unsigned int ide_ignore_cable;