Re: [ES40-developers] Interesting messages from Tru64

[Camiel V. <iam...@gm...>]

Hi Brian,

The ES40 has a management processor that takes care of monitoring
power suppies, fans, and other hardware bits and pieces. It is
extremely difficult to find any information about this. I managed to
find some info in the ES40 service manual, and basically played a lot
with things to get them to show up properly in SRM.

The management processor communicates with SRM - and I presume with
the OS - through a thing called Dual-Port-RAM. One port is connected
to the system bus, another to the management-processor. A lot of the
bytes are places where the OS can read device information, but in some
locations, the OS can deposit commands for the management-processor.
The following copmmands were found out through trial-and-error and
partial reverse engineering of SRM:

Address locations for commands:
  // 0xf9:	buffer size
  // 0xfb:fa	qualifier / address
  // 0xfc:	completion code (0 = ok, 80 = error, 81 = invalid code, 82
= invalid qualifier)
  // 0xfd:	rmc command id for response
  // 0xfe:	command code
  // 0xff:	rmc command id for command

Command codes:
  // 01:	update EEPROM
  // 02:	update baud rate
  // 03:	write to OCP
  // F0:	update RMC flash

It could very well be that there are more commands I don't know about,
and a failure to respond to these in a satisfactory manner may well be
the cause of the power supply failures and temperature warnings.

You can find most of what I managed to find out in DPR.cpp. Mind you,
this is some of the oldest and least-touched code in the emulator. It
has not changed (other than some of the standard changes that have
been made to the entire emulator) for well over a year, and a lot of
my comments are still in Dutch. (I'm sorry about that...) It might be
a good idea to put some read/write tracers in DPR.cpp, and try to
figure out what Tru64 is doing with these.

Camiel.





On Wed, Feb 27, 2008 at 2:19 PM, Brian Wheeler <bdw...@in...> wrote:
> I did a full install from dqb0 to dqa0 and while there were some
>  timeouts (this build was before I started on the interrupt resend code)
>  it installed and configured correctly (I left it run unattended
>  overnight).
>
>  However, once it came up, it started announcing hardware failures :)
>
>  -----------------
>  Broadcast Message from ro...@tr... (???) at 23:37 ...
>
>  The redundant power supply has failed.
>
>  Broadcast Message from ro...@tr... (???) at 23:37 ...
>
>  The system temperature is high. Possible reasons are
>   a clogged air filter or a high ambient room temperature.
>   The system will shut down in 14 minutes and 0 seconds..
>  ------------------
>
>  So...is there any documentation for the hardware monitoring stuff?
>
>  Brian
>
>
>
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