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Re: [qemu-s390x] [PATCH 10/15] s390-bios: Support for running format-0/1

From: Jason J. Herne
Subject: Re: [qemu-s390x] [PATCH 10/15] s390-bios: Support for running format-0/1 channel programs
Date: Thu, 10 Jan 2019 10:02:48 -0500
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On 1/10/19 7:15 AM, Cornelia Huck wrote:
On Wed, 9 Jan 2019 15:01:19 -0500
"Jason J. Herne" <address@hidden> wrote:

On 1/9/19 1:34 PM, Cornelia Huck wrote:
On Wed, 9 Jan 2019 13:10:26 -0500
"Jason J. Herne" <address@hidden> wrote:

I'm not sure what value there is in abstracting sense at the moment. I'm not 
even sure
what other device's sense data looks like. Since my description of the SENSE 
CCW comes
from an ECKD reference I have not been able to verify any areas of the data 
that are
common across device types. Thoughts?

There's SA22-7204-01 ("Common I/O Device Commands"), which is from 1992
(this is what I have on my disk -- is there anything newer?). It
specifies what bits 0-5 of byte 0 mean and states that bytes 1-31 are
optional and device-specific.

Maybe some other bits have been specified after 1992, but I have not
come across documentation for them.

That publication is no longer available. According to my quick research it has 
replaced by an internal only publication. I'll see what I can find.

The publication no longer being available is not good, as it is a
normative reference pointed to by the virtio standard (see

Is there any chance that at least that old version can be made
available again?

A quick web search turns up the following link:

So I guess it is available, even if the document has been superseded internally.

-- Jason J. Herne (address@hidden)

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