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PiSCSI / piscsi

PiSCSI allows a Raspberry Pi to function as emulated SCSI devices (hard disk, CD-ROM, and others) for vintage SCSI-based computers and devices. This is a fork of the RaSCSI project by GIMONS.
https://piscsi.org
BSD 3-Clause "New" or "Revised" License
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SCSI command 4A is not implemented - Get Event Status Notification #153

Open akuker opened 3 years ago

akuker commented 3 years ago

Using the current develop branch, when a modern Ubuntu host is used, the RaSCSI logs are filled with the following error messages:

Jul 26 19:35:51 rascsi RASCSI[30336]: [2021-07-26 19:35:51.768] [warning] virtual void SCSIDEV::Execute() Received unsupported command: $4A
Jul 26 19:35:51 rascsi RASCSI[30336]: [2021-07-26 19:35:51.768] [warning] void SASIDEV::CmdInvalid() Command not supported

The CD-ROM functionality still seems to be functional. On older Macintosh hardware, this error message isn't seen. But with Ubuntu 20, it is logged approximately every 2 seconds.

Command 4A is "GET EVENT STATUS NOTIFICATION". Details of how this should be implemented are in section 9.1.2 of the following document: https://www.t10.org/ftp/t10/document.97/97-108r0.pdf

uweseimet commented 3 years ago

Note that the latest document from 2009 (like the other SCSI specification documents, which are still being worked on) are available on https://www.t10.org/drafts.htm. I already added a naive implementation some time ago, so that the logs are not flooded with warnings. If notification by polling is requested a message on trace level will be logged with the latest codebase in uweseimet_develop. Requests for asynchronous notification are rejected because this kind of notification is optional.

uweseimet commented 10 months ago

Is there still any need for this ticket, i.e. for more than the naive implementation I added? If not I suggest to close this ticket. There are numerous SCSI commands PiSCSI does not implement, and IMO we should only add a ticket for a missing command if without this command something important does not work.