Shortly: it works -)
Now with more details. Module 'ata_generic' (CONFIG_ATA_GENERIC) may drive
IDER controller. Though, it will not take over this device without option
'all_generic_ide=1' (perhaps, because IDER controller match with "any"
alias, but not device-specific one?):
# modinfo ata_generic
..
alias: pci:v*d*sv*sd*bc01sc01i*
..
So, we should load it like
# modprobe ata_generic all_generic_ide=1
Now we can check, that it successfully takes over IDER controller
# lspci -nn | grep IDER
00:03.2 IDE interface [0101]: Intel Corporation Mobile PM965/GM965 PT IDER Controller [8086:2a06] (rev 0c)
# ls -l /sys/bus/pci/devices/0000:00:03.2/driver
lrwxrwxrwx 1 root root 0 Jan 31 17:44 /sys/bus/pci/devices/0000:00:03.2/driver -> ../../../bus/pci/drivers/ata_generic
But in order to have kernel see scsi targets on this IDER controller, we
need to enable IDE Redirection in remote management console (you may use
Manageability Commander Tool from Intel Manageability Developer Tool Kit
for testing). There will be two scsi targets on this scsi host: floppy
(bus=0, id=0, lun=0) and cdrom (bus=0, id=1, lun=0). Floppy will be
handled by sd, and cdrom by sr_mod:
# ls -l /sys/bus/pci/devices/0000:00:03.2/host21/
total 0
drwxr-xr-x 2 root root 0 Jan 31 18:16 power
drwxr-xr-x 3 root root 0 Jan 31 18:16 scsi_host
lrwxrwxrwx 1 root root 0 Jan 31 17:44 subsystem -> ../../../../bus/scsi
drwxr-xr-x 4 root root 0 Jan 31 17:44 target21:0:0
drwxr-xr-x 4 root root 0 Jan 31 17:44 target21:0:1
-rw-r--r-- 1 root root 4096 Jan 31 17:44 uevent
# ls -l /sys/bus/pci/devices/0000:00:03.2/host21/target21:0:0/21:0:0:0/driver
lrwxrwxrwx 1 root root 0 Jan 31 17:44 /sys/bus/pci/devices/0000:00:03.2/host21/target21:0:0/21:0:0:0/driver -> ../../../../../../bus/scsi/drivers/sd
# ls -l /sys/bus/pci/devices/0000:00:03.2/host21/target21:0:1/21:0:1:0/driver
lrwxrwxrwx 1 root root 0 Jan 31 17:45 /sys/bus/pci/devices/0000:00:03.2/host21/target21:0:1/21:0:1:0/driver -> ../../../../../../bus/scsi/drivers/sr
And now the only left is to make these modules autoload during boot. Here
is one thing to note: we should load all specific ata modules (for other
hardware, if any) _before_ 'ata_generic'. Otherwise with parameter
'all_generic_ide' it'll take over all available ata controllers. Order of
ata drivers and scsi drivers (sr_mod, sd) does not matter. So, something
like this should be written in modprobe.conf:
modprobe.conf:
options ata_generic all_generic_ide=1
install ata_generic /sbin/modprobe ata_piix ; /sbin/modprobe --ignore-install ata_generic
or
modprobe.conf:
options ata_generic all_generic_ide=1
install ata_generic /sbin/modprobe ata_piix ; /sbin/modprobe --ignore-install ata_generic $CMDLINE_OPTS
though, adding $CMDLINE_OPTS (to add all options from the command line) is
useless here - 'ata_generic' has only one option.
Also there is another one module, which can drive IDER controller -
'ide_pci_generic' (CONFIG_BLK_DEV_GENERIC). Unlike 'ata_generic', which
uses libata, this module uses old ATA subsystem (CONFIG_IDE) (are terms
here used correctly?). If you use this driver, cdrom drive will no longer
be present as scsi device. Now it'll be handled by 'ide_cd' driver
(CONFIG_BLK_DEV_IDECD). 'ide_pci_generic' driver also requires option
'all_generic_ide' set in order to take over any device.
Here are some results from booting linux with different ATA drivers used
(though root partition in these tests is on the hard drive).
All three boot scenarios require SATA AHCI controller to be in
compatibility mode, otherwise ATA drivers can not work with it and kernel
can't access root partition.
1. ata_piix. Here ata_piix driver is compiled in and handles all ATA
controllers. It correctly takes over AHCI controller (in
compatiblility mode) and over PATA controller. ata_generic was loaded
as module later to handle IDER controller.
Here is some info about such system config:
# ls -l /sys/bus/pci/devices/*/driver
..
lrwxrwxrwx 1 root root 0 Feb 1 13:06 /sys/bus/pci/devices/0000:00:03.2/driver -> ../../../bus/pci/drivers/ata_generic
..
lrwxrwxrwx 1 root root 0 Feb 1 13:06 /sys/bus/pci/devices/0000:00:1f.2/driver -> ../../../bus/pci/drivers/ata_piix
..
# lspci -nn | grep IDE
00:03.2 IDE interface [0101]: Intel Corporation Mobile PM965/GM965 PT IDER Controller [8086:2a06] (rev 0c)
00:1f.2 IDE interface [0101]: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA IDE Controller [8086:2828] (rev 03)
# ls -l /sys/bus/pci/devices/0000\:00\:1f.2/
total 0
..
lrwxrwxrwx 1 root root 0 Feb 1 13:06 driver -> ../../../bus/pci/drivers/ata_piix
..
drwxr-xr-x 5 root root 0 Feb 1 2011 host0
drwxr-xr-x 5 root root 0 Feb 1 2011 host1
..
# ls -l /sys/bus/pci/devices/0000\:00\:1f.2/host0/
total 0
drwxr-xr-x 2 root root 0 Feb 1 13:13 power
drwxr-xr-x 3 root root 0 Feb 1 2011 scsi_host
lrwxrwxrwx 1 root root 0 Feb 1 2011 subsystem -> ../../../../bus/scsi
drwxr-xr-x 4 root root 0 Feb 1 2011 target0:0:0
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000\:00\:1f.2/host0/target0\:0\:0/0\:0\:0\:0/driver
lrwxrwxrwx 1 root root 0 Feb 1 13:13 /sys/bus/pci/devices/0000:00:1f.2/host0/target0:0:0/0:0:0:0/driver -> ../../../../../../bus/scsi/drivers/sd
# ls -l /sys/bus/pci/devices/0000\:00\:1f.2/host1/
total 0
drwxr-xr-x 2 root root 0 Feb 1 13:11 power
drwxr-xr-x 3 root root 0 Feb 1 2011 scsi_host
lrwxrwxrwx 1 root root 0 Feb 1 2011 subsystem -> ../../../../bus/scsi
drwxr-xr-x 4 root root 0 Feb 1 2011 target1:0:0
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000\:00\:1f.2/host1/target1\:0\:0/1\:0\:0\:0/driver
lrwxrwxrwx 1 root root 0 Feb 1 13:09 /sys/bus/pci/devices/0000:00:1f.2/host1/target1:0:0/1:0:0:0/driver -> ../../../../../../bus/scsi/drivers/sr
2. ata_generic. Here ata_generic driver is compiled in and handles all
ATA controllers. It successfully takes over AHCI controller (in
compatibility mode), PATA controller and IDER controller. Though, if
IDE Redirection is enabled in management console (kernel can see
devices attached to IDER controller), ATA devices may be named in not
the order you expect, so 'root=' kernel parameter should be adjust
correspondingly (or udev from initramfs should be used). To take over
any device this driver requires 'all-generic-ide' option set at kernel
command line:
ata_generic.all_generic_ide=1
or
ata-generic.all-generic-ide=1
Here is some info about such system config:
# ls -l /sys/bus/pci/devices/*/driver
..
lrwxrwxrwx 1 root root 0 Feb 1 14:20 /sys/bus/pci/devices/0000:00:03.2/driver -> ../../../bus/pci/drivers/ata_generic
..
lrwxrwxrwx 1 root root 0 Feb 1 14:20 /sys/bus/pci/devices/0000:00:1f.2/driver -> ../../../bus/pci/drivers/ata_generic
..
# lspci -nn | grep IDE
00:03.2 IDE interface [0101]: Intel Corporation Mobile PM965/GM965 PT IDER Controller [8086:2a06] (rev 0c)
00:1f.2 IDE interface [0101]: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA IDE Controller [8086:2828] (rev 03)
# ls -l /sys/bus/pci/devices/0000\:00\:03.2/
..
lrwxrwxrwx 1 root root 0 Feb 1 14:20 driver -> ../../../bus/pci/drivers/ata_generic
..
drwxr-xr-x 6 root root 0 Feb 1 2011 host0
drwxr-xr-x 4 root root 0 Feb 1 2011 host1
..
# readlink -f /sys/class/block/sda/device
/sys/devices/pci0000:00/0000:00:03.2/host0/target0:0:0/0:0:0:0
# ls -l /sys/bus/pci/devices/0000\:00\:1f.2/host2/
total 0
drwxr-xr-x 2 root root 0 Feb 1 14:23 power
drwxr-xr-x 3 root root 0 Feb 1 2011 scsi_host
lrwxrwxrwx 1 root root 0 Feb 1 2011 subsystem -> ../../../../bus/scsi
drwxr-xr-x 4 root root 0 Feb 1 2011 target2:0:0
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000:00:1f.2/host2/target2:0:0/2:0:0:0/driver
lrwxrwxrwx 1 root root 0 Feb 1 14:23 /sys/bus/pci/devices/0000:00:1f.2/host2/target2:0:0/2:0:0:0/driver -> ../../../../../../bus/scsi/drivers/sd
# ls -l /sys/bus/pci/devices/0000:00:1f.2/host3/
total 0
drwxr-xr-x 2 root root 0 Feb 1 14:24 power
drwxr-xr-x 3 root root 0 Feb 1 2011 scsi_host
lrwxrwxrwx 1 root root 0 Feb 1 2011 subsystem -> ../../../../bus/scsi
drwxr-xr-x 4 root root 0 Feb 1 2011 target3:0:0
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000:00:1f.2/host3/target3:0:0/3:0:0:0/driver
lrwxrwxrwx 1 root root 0 Feb 1 14:24 /sys/bus/pci/devices/0000:00:1f.2/host3/target3:0:0/3:0:0:0/driver -> ../../../../../../bus/scsi/drivers/sr
# ls -l /sys/class/block/sd*
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sda -> ../../devices/pci0000:00/0000:00:03.2/host0/target0:0:0/0:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb1 -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb/sdb1
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb2 -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb/sdb2
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb3 -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb/sdb3
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb4 -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb/sdb4
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb5 -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb/sdb5
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/sdb6 -> ../../devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sdb/sdb6
3. ide_pci_generic. Here ide_pci_generic driver is compiled in and
handles all ATA controllers. This driver represents old IDE subsystem,
and noticeable difference from new ATA subsystem (libata) is that it
names devices as /dev/hd* instead of /dev/sd*. As well as ata_generic
it successfully takes over all AHCI, PATA and IDER controllers. Device
names here are also different from all what was before, so, 'root='
kernel parameter should be adjusted. To take over any device this
driver requires 'all-generic-ide' option set at kernel command line:
ide-pci-generic.all-generic-ide
or
ide-pci-generic.all-generic-ide
Here is some info about such system config:
# ls -l /sys/bus/pci/devices/*/driver
..
lrwxrwxrwx 1 root root 0 Feb 1 14:49 /sys/bus/pci/devices/0000:00:03.2/driver -> ../../../bus/pci/drivers/PCI_IDE
..
lrwxrwxrwx 1 root root 0 Feb 1 14:49 /sys/bus/pci/devices/0000:00:1f.2/driver -> ../../../bus/pci/drivers/PCI_IDE
..
# ls -l /sys/bus/pci/devices/0000:00:03.2/
total 0
..
lrwxrwxrwx 1 root root 0 Feb 1 14:49 driver -> ../../../bus/pci/drivers/PCI_IDE
..
drwxr-xr-x 6 root root 0 Feb 1 2011 ide0
drwxr-xr-x 4 root root 0 Feb 1 2011 ide1
..
# ls -l /sys/bus/pci/devices/0000:00:03.2/ide0/
total 0
drwxr-xr-x 3 root root 0 Feb 1 2011 0.0
drwxr-xr-x 5 root root 0 Feb 1 2011 0.1
drwxr-xr-x 3 root root 0 Feb 1 2011 ide_port
drwxr-xr-x 2 root root 0 Feb 1 14:49 power
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000:00:03.2/ide0/0.0/
(no 'driver' symlink - module required for floppy to work was not compiled (what module is needed?))
# ls -l /sys/bus/pci/devices/0000:00:03.2/ide0/0.1/
..
lrwxrwxrwx 1 root root 0 Feb 1 14:50 driver -> ../../../../../bus/ide/drivers/ide-cdrom
..
# ls -l /sys/bus/pci/devices/0000:00:1f.2/
..
lrwxrwxrwx 1 root root 0 Feb 1 14:49 driver -> ../../../bus/pci/drivers/PCI_IDE
..
drwxr-xr-x 5 root root 0 Feb 1 2011 ide2
drwxr-xr-x 5 root root 0 Feb 1 2011 ide3
..
# ls -l /sys/bus/pci/devices/0000:00:1f.2/ide2/
total 0
drwxr-xr-x 5 root root 0 Feb 1 2011 2.0
drwxr-xr-x 3 root root 0 Feb 1 2011 ide_port
drwxr-xr-x 2 root root 0 Feb 1 14:51 power
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000:00:1f.2/ide2/2.0/
..
lrwxrwxrwx 1 root root 0 Feb 1 14:51 driver -> ../../../../../bus/ide/drivers/ide-gd
..
# ls -l /sys/bus/pci/devices/0000:00:1f.2/ide2/2.0/block/
total 0
drwxr-xr-x 12 root root 0 Feb 1 2011 hde
# ls -l /sys/bus/pci/devices/0000:00:1f.2/ide3/
total 0
drwxr-xr-x 5 root root 0 Feb 1 2011 3.0
drwxr-xr-x 3 root root 0 Feb 1 2011 ide_port
drwxr-xr-x 2 root root 0 Feb 1 14:51 power
-rw-r--r-- 1 root root 4096 Feb 1 2011 uevent
# ls -l /sys/bus/pci/devices/0000:00:1f.2/ide3/3.0/
..
lrwxrwxrwx 1 root root 0 Feb 1 14:52 driver -> ../../../../../bus/ide/drivers/ide-cdrom
..
# ls -l /sys/bus/pci/devices/0000:00:1f.2/ide3/3.0/block/
total 0
drwxr-xr-x 6 root root 0 Feb 1 2011 hdg
# ls -l /sys/class/block/hd*
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hdb -> ../../devices/pci0000:00/0000:00:03.2/ide0/0.1/block/hdb
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde1 -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde/hde1
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde2 -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde/hde2
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde3 -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde/hde3
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde4 -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde/hde4
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde5 -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde/hde5
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hde6 -> ../../devices/pci0000:00/0000:00:1f.2/ide2/2.0/block/hde/hde6
lrwxrwxrwx 1 root root 0 Feb 1 2011 /sys/class/block/hdg -> ../../devices/pci0000:00/0000:00:1f.2/ide3/3.0/block/hdg
# ls -l /sys/bus/pci/drivers/PCI_IDE/module
lrwxrwxrwx 1 root root 0 Feb 1 15:01 /sys/bus/pci/drivers/PCI_IDE/module -> ../../../../module/ide_pci_generic
Hence, to boot linux from cdrom drive on IDER controller, we just need to
have compiled into the kernel either ata_generic or ide_pci_generic
driver. I test this with gentoo livecd and SystemRescueCd. First one has
ide_pci_generic driver compiled in and should be booted like
gentoo ide-pci-generic.all-generic-ide
second one has ata_generic driver compiled and should be booted like
<..system rescue cd boot options..> ata-generic.all-generic-ide=1
PS. This was tested on motherboard with Intel PM965 chipset (Centrino
vPro) with AMT 2.6 (or 2.5?) and kernel 2.6.36.
вторник, 1 февраля 2011 г.
Intel AMT IDE Redirection and linux
(updated version)
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