Pavel Roskin wrote:
On Wed, 2009-05-20 at 23:40 +0200, Christian Franke wrote:
The attached patch should fix this. It should also prevents misleading
error messages if a device does not exist.
It helps detect CD-ROM under qemu. But on the real hardware, it
introduces ghost drives.
Without the patch, I have (ata7) for the SATA hard drive. With the
patch, I have (ata7) for the SATA hard drive, (ata6) for the SATA DVD-RW
and two bogus unreadable drives (ata0) and (ata1).
Thanks for this test. I could not reproduce this yet. I presume that the
controller behind (ata0) and (ata1) is the chipset's PATA controller.
If no device is connected, these controllers often echo a write to (e.g.
command) register address back to the next read of (e.g. status)
register address if the time between is too short. (No VM emulates this
behavior :-)
Could you possibly repeat this test with 'debug=ata' enabled? If this
removes the bogus drives, it is likely a problem of too short wait times.
I will prepare a new patch with longer timeouts and more thorough
register tests during identify.
--
Regards,
Christian Franke
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