[rescue] SS20 SBus & burst modes (Re: A SBus card for SPARCstation designed in 2020...)

Romain Dolbeau romain at dolbeau.org
Fri Dec 18 11:44:04 CST 2020


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:

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?


Romain Dolbeau

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