[geeks] Ultra 2: what's U1401?

[John Core]

It's most likely RAM. Depending on the firmware, you may need Sun branded
ram.

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On Tue, Aug 31, 2021 at 1:30 PM Mouse <mouse at rodents-montreal.org> wrote:

> I've got an Ultra 2 that fails POST.  But the error is cryptic enough I
> can't tell whether it's anything reasonably fixable.  I'm wondering if
> anyone can tell me, or point me towards doc that can tell me.
>
> The error I'm seeing is
>
> 0>APC Test
> 0>    APC Registers Tests Test
> 0>    APC DVMA Test
> 0>ERROR: TEST=APC,SUBTEST=APC DVMA ID=16.2
> 0>Component under test: APC U1401
> 0>    Unexpected event occured
> 0>    Data Access Error from address 00000000.001319c0
> 0> tl  tt         tstate                 tpc               tnpc
> 0> 01  63  00000011.80001603  000001ff.f004bd24  000001ff.f004bd28
> 0>    AFSR 00000000.00100000
> 0>    (CE) Correctable ECC Error
> 0>   SDBH[143:72] Syndrome is c8. CE Error on bit 67
> 0>    SDBH = 00000000.000000c8 SDBL = 00000000.00000060
>
> I found 802-2561-11.pdf, but it's little help.  The block diagram on
> page C-2 seems to indicate that the APC is purely for audio.  C-29 has
> another diagram, but all that does is tell me it's not a RAM stick (the
> "Correectable ECC Error" part made me hope it was RAM).  So far I
> haven't found anything in there that actually helps me.
>
> .idprom output is, I suspect, characteristic of a dead battery:
>
> ok .idprom
> Format/Type: ff ff Ethernet: ff ff ff ff ff ff Date: ff ff ff ff
> Serial: ff ef ff Checksum: ff
> ok
>
> It occurs to me that a dead battery could cause POST failure, but if so
> it's unexpected to the POST author; it complains about U1401, while the
> NVRAM is U2006.
>
> I've tried to reset the MAC, but whenever I try mkp or mkpl it wedges,
> needing a hard power-cycle.  The machine does have a disk in it, but
> when I try to "boot disk -s" I get
>
> Boot device: /sbus/SUNW,fas at e,8800000/sd at 0,0  File and args: -s
>
> and it wedges there.
>
> Any thoughts?  I'd hate to send this off to the scrapper if it doesn't
> deserve it, but I also don't want to beat my head against the wall of
> trying to make broken hardware work.
>
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