[Qemu-devel] Linux 2.6.21 doesn't work with qemu-arm SCSI controller anymore.

[Rob Landley]

In the 2.6.21 kernel the sym53c8xx_2 SCSI controller changed in a way that 
QEMU's virtual SCSI controller doesn't handle this properly:

Here's what 2.6.20 does during boot:

> Loading iSCSI transport class v2.0-724.
> PCI: enabling device 0000:00:0c.0 (0140 -> 0143)
> sym0: <895a> rev 0x0 at pci 0000:00:0c.0 irq 27
> sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
> sym0: SCSI BUS has been reset.
> scsi0 : sym-2.2.3
> scsi 0:0:0:0: Direct-Access     QEMU     QEMU HARDDISK    0.9. PQ: 0 ANSI:
> 3 target0:0:0: tagged command queuing enabled, command queue depth 16.
> target0:0:0: Beginning Domain Validation
>  target0:0:0: Domain Validation skipping write tests
>  target0:0:0: Ending Domain Validation
> scsi 0:0:2:0: CD-ROM            QEMU     QEMU CD-ROM      0.9. PQ: 0 ANSI:
> 3 target0:0:2: tagged command queuing enabled, command queue depth 16.
> target0:0:2: Beginning Domain Validation
>  target0:0:2: Domain Validation skipping write tests
>  target0:0:2: Ending Domain Validation
> SCSI device sda: 524288 512-byte hdwr sectors (268 MB)
> sda: Write Protect is off
> SCSI device sda: write cache: enabled, read cache: enabled, doesn't support
> DPO or FUA SCSI device sda: 524288 512-byte hdwr sectors (268 MB)
> sda: Write Protect is off
> SCSI device sda: write cache: enabled, read cache: enabled, doesn't support
> DPO or FUA sda: unknown partition table
> sd 0:0:0:0: Attached scsi disk sda
> sr0: scsi3-mmc drive: 16x/50x cd/rw xa/form2 cdda tray
> Uniform CD-ROM driver Revision: 3.20
> mice: PS/2 mouse device common for all mice
> TCP cubic registered
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> NET: Registered protocol family 15
> 802.1Q VLAN Support v1.8 Ben Greear <address@hidden>
> All bugs added by David S. Miller <address@hidden>
> VFS: Mounted root (ext2 filesystem).
> Freeing init memory: 100K
> sh-2.05b#


And here's what 2.6.21 does:

> Loading iSCSI transport class v2.0-724.
> PCI: enabling device 0000:00:0c.0 (0140 -> 0143)
> sym0: <895a> rev 0x0 at pci 0000:00:0c.0 irq 0
> sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
> sym0: SCSI BUS has been reset.
> scsi0 : sym-2.2.3
> scsi 0:0:0:0: ABORT operation started.
> scsi 0:0:0:0: ABORT operation timed-out.
> scsi 0:0:0:0: DEVICE RESET operation started.
> scsi 0:0:0:0: DEVICE RESET operation timed-out.
> scsi 0:0:0:0: BUS RESET operation started.
> scsi 0:0:0:0: BUS RESET operation timed-out.
> scsi 0:0:0:0: HOST RESET operation started.
> sym0: SCSI BUS has been reset.
> scsi 0:0:0:0: HOST RESET operation timed-out.
> scsi 0:0:0:0: scsi: Device offlined - not ready after error recovery
> scsi 0:0:1:0: ABORT operation started.
> scsi 0:0:1:0: ABORT operation timed-out.
> scsi 0:0:1:0: DEVICE RESET operation started.
> scsi 0:0:1:0: DEVICE RESET operation timed-out.
> scsi 0:0:1:0: BUS RESET operation started.
> scsi 0:0:1:0: BUS RESET operation timed-out.
> scsi 0:0:1:0: HOST RESET operation started.
> sym0: SCSI BUS has been reset.

[ Skip lots of the same... ]

> scsi 0:0:14:0: HOST RESET operation started.
> sym0: SCSI BUS has been reset.
> scsi 0:0:14:0: HOST RESET operation timed-out.
> scsi 0:0:14:0: scsi: Device offlined - not ready after error recovery
> scsi 0:0:15:0: ABORT operation started.
> scsi 0:0:15:0: ABORT operation timed-out.
> scsi 0:0:15:0: DEVICE RESET operation started.
> scsi 0:0:15:0: DEVICE RESET operation timed-out.
> scsi 0:0:15:0: BUS RESET operation started.
> scsi 0:0:15:0: BUS RESET operation timed-out.
> scsi 0:0:15:0: HOST RESET operation started.
> sym0: SCSI BUS has been reset.
> scsi 0:0:15:0: HOST RESET operation timed-out.
> scsi 0:0:15:0: scsi: Device offlined - not ready after error recovery
> mice: PS/2 mouse device common for all mice
> TCP cubic registered
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> NET: Registered protocol family 15
> 802.1Q VLAN Support v1.8 Ben Greear <address@hidden>
> All bugs added by David S. Miller <address@hidden>
> VFS: Cannot open root device "sda" or unknown-block(0,0)
> Please append a correct "root=" boot option; here are the available
> partitions: Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0) Rebooting in 1 seconds..

I am _totally_ out of my depth trying to debug this.  I continue to poke at 
it, but it was brought to my attention that the list doesn't know about it...

Rob
-- 
The Google cluster became self-aware at 2:14am EDT August 29, 2007...