new scsi hardware detection in 2.4.7(pre)

new scsi hardware detection in 2.4.7(pre)

[Olaf Hering]

Hi,

I get this on non-scsi systems with scsi compiled into the kernel:

SCSI subsystem driver Revision: 1.00
request_module[scsi_hostadapter]: Root fs not mounted
request_module[scsi_hostadapter]: Root fs not mounted
request_module[scsi_hostadapter]: Root fs not mounted


iBook, PowerBook etc. 



#
# SCSI support
#
CONFIG_SCSI=y

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
CONFIG_SD_EXTRA_DEVS=40
CONFIG_CHR_DEV_ST=m
# CONFIG_CHR_DEV_OSST is not set
CONFIG_BLK_DEV_SR=y
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_SR_EXTRA_DEVS=2
CONFIG_CHR_DEV_SG=y

#
# Some SCSI devices (e.g. CD jukebox) support multiple LUNs
#
# CONFIG_SCSI_DEBUG_QUEUES is not set
CONFIG_SCSI_MULTI_LUN=y
# CONFIG_SCSI_CONSTANTS is not set
# CONFIG_SCSI_LOGGING is not set

#
# SCSI low-level drivers
#
# CONFIG_BLK_DEV_3W_XXXX_RAID is not set
# CONFIG_SCSI_7000FASST is not set
# CONFIG_SCSI_ACARD is not set
# CONFIG_SCSI_AHA152X is not set
# CONFIG_SCSI_AHA1542 is not set
# CONFIG_SCSI_AHA1740 is not set
# CONFIG_SCSI_AACRAID is not set
CONFIG_SCSI_AIC7XXX=y
CONFIG_AIC7XXX_CMDS_PER_DEVICE=8
CONFIG_AIC7XXX_RESET_DELAY_MS=15000
# CONFIG_AIC7XXX_BUILD_FIRMWARE is not set
# CONFIG_SCSI_DPT_I2O is not set
CONFIG_SCSI_ADVANSYS=m



Any ideas whats wrong here? I see that in all 2.4.7pre kernels.


Gruss Olaf

-- 
 $ man clone

BUGS
       Main feature not yet implemented...

Re: new scsi hardware detection in 2.4.7(pre)

[Keith Owens]

On Mon, 23 Jul 2001 17:10:19 +0200, 
Olaf Hering <olh@suse.de> wrote:
>I get this on non-scsi systems with scsi compiled into the kernel:
>
>SCSI subsystem driver Revision: 1.00
>request_module[scsi_hostadapter]: Root fs not mounted
>request_module[scsi_hostadapter]: Root fs not mounted
>request_module[scsi_hostadapter]: Root fs not mounted

The SCSI midlayer is trying to load the SCSI host adapter, that is an
unavoidable side effect of including SCSI support.  Because no adapter
is found, kmod tries to automatically load a module that can find a
host adapter.  The "Root fs not mounted" message occurs when you try to
load any module before / is mounted.

Re: new scsi hardware detection in 2.4.7(pre)

[Olaf Hering]

On Tue, Jul 24, Keith Owens wrote:

> On Mon, 23 Jul 2001 17:10:19 +0200, 
> Olaf Hering <olh@suse.de> wrote:
> >I get this on non-scsi systems with scsi compiled into the kernel:
> >
> >SCSI subsystem driver Revision: 1.00
> >request_module[scsi_hostadapter]: Root fs not mounted
> >request_module[scsi_hostadapter]: Root fs not mounted
> >request_module[scsi_hostadapter]: Root fs not mounted
> 
> The SCSI midlayer is trying to load the SCSI host adapter, that is an
> unavoidable side effect of including SCSI support.  Because no adapter
> is found, kmod tries to automatically load a module that can find a
> host adapter.  The "Root fs not mounted" message occurs when you try to
> load any module before / is mounted.

Does that make any sense? I mean, there are some scsi drivers, none of
them found a valid device, why do we look for more drivers? It would
make sense if there are no low level device drivers in the kernel
binary.


Gruss Olaf

-- 
 $ man clone

BUGS
       Main feature not yet implemented...

Re: new scsi hardware detection in 2.4.7(pre)

[Keith Owens]

On Mon, 30 Jul 2001 15:31:17 +0200, 
Olaf Hering <olh@suse.de> wrote:
>On Tue, Jul 24, Keith Owens wrote:
>
>> On Mon, 23 Jul 2001 17:10:19 +0200, 
>> Olaf Hering <olh@suse.de> wrote:
>> >I get this on non-scsi systems with scsi compiled into the kernel:
>> >
>> >SCSI subsystem driver Revision: 1.00
>> >request_module[scsi_hostadapter]: Root fs not mounted
>> >request_module[scsi_hostadapter]: Root fs not mounted
>> >request_module[scsi_hostadapter]: Root fs not mounted
>> 
>> The SCSI midlayer is trying to load the SCSI host adapter, that is an
>> unavoidable side effect of including SCSI support.  Because no adapter
>> is found, kmod tries to automatically load a module that can find a
>> host adapter.  The "Root fs not mounted" message occurs when you try to
>> load any module before / is mounted.
>
>Does that make any sense? I mean, there are some scsi drivers, none of
>them found a valid device, why do we look for more drivers? It would
>make sense if there are no low level device drivers in the kernel
>binary.

There is no way for the mid layer to distinguish between "no SCSI card
configured into kernel" and "SCSI card configured but failed to detect
hardware".  Even when there is a card built into the kernel, it still
makes sense to scan for modules if the initial card failed.  That gives
you fallback to modules when you change your hardware.

If you boot a SCSI kernel on a non-SCSI box then you should alias
scsi_hostadapter off.  You still get the 'Root fs not mounted' warning
messages, just ignore them.  If you are using one kernel build for lots
of different hardware you should be using initrd, then the root fs
messages go away as well.

Re: new scsi hardware detection in 2.4.7(pre)

[majordomo kernel]

It makes more sense if U can send a copy to SCSI group
too.People like Eric and many others only looks at the
linux-scsi group.I think by doing this U can cater to
a wider group of people and more specifically this
sort
of issues are relavant to both -kernel and scsi group.
I hope and expect that in future this will be taken
care of.
Thanx
--- Keith Owens <kaos@ocs.com.au> wrote:
> On Mon, 30 Jul 2001 15:31:17 +0200, 
> Olaf Hering <olh@suse.de> wrote:
> >On Tue, Jul 24, Keith Owens wrote:
> >
> >> On Mon, 23 Jul 2001 17:10:19 +0200, 
> >> Olaf Hering <olh@suse.de> wrote:
> >> >I get this on non-scsi systems with scsi
> compiled into the kernel:
> >> >
> >> >SCSI subsystem driver Revision: 1.00
> >> >request_module[scsi_hostadapter]: Root fs not
> mounted
> >> >request_module[scsi_hostadapter]: Root fs not
> mounted
> >> >request_module[scsi_hostadapter]: Root fs not
> mounted
> >> 
> >> The SCSI midlayer is trying to load the SCSI host
> adapter, that is an
> >> unavoidable side effect of including SCSI
> support.  Because no adapter
> >> is found, kmod tries to automatically load a
> module that can find a
> >> host adapter.  The "Root fs not mounted" message
> occurs when you try to
> >> load any module before / is mounted.
> >
> >Does that make any sense? I mean, there are some
> scsi drivers, none of
> >them found a valid device, why do we look for more
> drivers? It would
> >make sense if there are no low level device drivers
> in the kernel
> >binary.
> 
> There is no way for the mid layer to distinguish
> between "no SCSI card
> configured into kernel" and "SCSI card configured
> but failed to detect
> hardware".  Even when there is a card built into the
> kernel, it still
> makes sense to scan for modules if the initial card
> failed.  That gives
> you fallback to modules when you change your
> hardware.
> 
> If you boot a SCSI kernel on a non-SCSI box then you
> should alias
> scsi_hostadapter off.  You still get the 'Root fs
> not mounted' warning
> messages, just ignore them.  If you are using one
> kernel build for lots
> of different hardware you should be using initrd,
> then the root fs
> messages go away as well.
> 
> -
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