On Sun, Jun 28, 2020 at 12:59:10PM +0200, Mark Kettenis wrote:
> Would be nice if we could give a hint about the firmware revisions
> that are known to work.
https://www.oracle.com/servers/technologies/firmware/release-history-jsp.html#T4-2

SysFW 8.9.11 from 10.01.2019 produces the following versions on my T4-2:

        hypervisor_version = Hypervisor 1.15.16 2018/11/28 07:41
        obp_version = OpenBoot 4.38.16 2018/11/28 07:24
        sysfw_version = Sun System Firmware 8.9.11 2018/11/28 07:59

I *assume* 8.9.x to work as well because that is what used to run on my
machine prior to updating it, buts it's guess-work and none of the
publicly available information puts actual dates next to the SysFW
versions listed on above mentioned link, so I have no means to pick a
version based on `-> show /HOST' output from Koakuma listing their known
to be broken versions.

Here's a diff that explicitly mentions "SysFW 8.9.11" becuase that is
all I can guarantee;  users with other firmware versions are encouraged
to help bisect the breaking^Wfixing change.

OK?


Index: sparc64.html
===================================================================
RCS file: /cvs/www/sparc64.html,v
retrieving revision 1.403
diff -u -p -r1.403 sparc64.html
--- sparc64.html        19 May 2020 02:02:10 -0000      1.403
+++ sparc64.html        28 Jun 2020 11:38:18 -0000
@@ -230,6 +230,11 @@ and SPARC Enterprise T5120/T5220 may req
 before OpenBSD can be successfully installed.  The SPARC Enterprise
 T5120/T5220 needs at least OBP 4.28.0.
 
+On machines like the Oracle SPARC T4-2, older firmware versions from
+around 2011 are known to cause kernel panics and crashes in
+<a href="https://man.openbsd.org/sparc64/ldomd.8";>ldomd</a>;  later
+versions, at least SysFW 8.9.11 from 2018, are known to work.
+
 <h4>Supported devices</h4>
 
 <ul>

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