[rescue] rescue Digest, Vol 217, Issue 8

[Gary Sloane]

Ask Mike Bradley, formerly my partner at SB/US Engineering Inc. Tell me your
email addr and I'll forward it to him.

G

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Subject: rescue Digest, Vol 217, Issue 8

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Today's Topics:

   1. SS20 SBus & burst modes (Re: A SBus card for SPARCstation
      designed in 2020...) (Romain Dolbeau)


----------------------------------------------------------------------

Message: 1
Date: Fri, 18 Dec 2020 18:44:04 +0100
From: Romain Dolbeau <romain at dolbeau.org>
To: The Rescue List <rescue at sunhelp.org>
Cc: sunhelp <sunhelp at sunhelp.org>
Subject: [rescue] SS20 SBus & burst modes (Re: A SBus card for
	SPARCstation designed in 2020...)
Message-ID:
	<CADuzgbpYTh1BtUN-NGAodbNKWUbGZxMgke+aB+wRcKFg02jrag at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Hello,

Trying to improve my SBusFPGA design & NetBSD driver, I hit on an interesting
(?) question: the status of 64-bits extended transfers (and even 32-bits
16-words burst) on the SPARCstation 20. The full details are in the NetBSD
port-sparc mailing list there:
<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail-index.
netbsd.org%2Fport-sparc%2F2020%2F12%2F18%2Fmsg002291.html&data=04%7C01%7C
%7C0544ddd743c8417a9ddb08d8a37ebf36%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C
0%7C637439112056215063%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2
luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=UT9AUiHVSPlKHtyfz5P8P5E
xSU8yDd6ictJHAF8sHqM%3D&reserved=0>.

Short version: some Sun document and a PROM attribute say yes, NetBSD code and
lack of Solaris support say no, my guess is 'somewhere in between' (yes
device-to-device, no device-to|from-memory).

Anyone here that could shine some light on the subject?

Cordially,

--
Romain Dolbeau


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End of rescue Digest, Vol 217, Issue 8
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