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Nicolas Joly | 11 Jun 2011 12:36
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fpgetround/fpsetround do not work


Hi,

I just had soe more time to look into the failures or regression test
for -current NetBSD/alpha i run from time to time on a PWS500au
machine (available at http://www.netbsd.org/~njoly/alpha-atf/).

Checking the lib/libc/ieeefp/t_round/fpround test show that
fpgetround/fpsetround do not work as expected, but FLT_ROUNDS do.

njoly <at> thanos [~]> /usr/tests/lib/libc/ieeefp/t_round fpround
*** Check failed: /local/src/NetBSD/src/tests/lib/libc/ieeefp/t_round.c:41: fpgetround() != FP_RN
*** Check failed: /local/src/NetBSD/src/tests/lib/libc/ieeefp/t_round.c:64: fpsetround(FP_RN)
!= FP_RN
*** Check failed: /local/src/NetBSD/src/tests/lib/libc/ieeefp/t_round.c:67: fpgetround() != FP_RN

Lokking into the respective code show that both functions
(lib/libc/arch/alpha/gen/{flt_rounds,fpgetround}.c) use the same
code except for trapb operands which where removed in 2001.

Adding back the trapb ops to fpgetround()/fpsetround() make it work as
expected.

njoly <at> thanos [~]> /usr/tests/lib/libc/ieeefp/t_round fpround
passed

Any reason to not commit the attached patch ?

Thanks.
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der Mouse | 12 Jun 2011 07:16

Re: magic switch to ARC console?

Back on May 31 I (quoted and) wrote, of my PWS 600au,

>> You may only power down the machine from ARC (F10), but using the
>> soft reset on the front panel retains the CMOS.
> Then I guess I need to replace the battery.  Needing physical access
> to bring the machine back from a power-cycle is..a problem, in my
> setup.

Okay, today I pulled the machine apart, popped out the CPU/memory/etc
board, and replaced the battery.

Now it won't enter _either_ console.  On power-up, the console gets a
NUL, then, after a pause, a capital A.  Nothing further.

There are eight LEDs on the board, near the accessible edge, next to
the memory sockets.  They are arranged in two rows of four, with the
columns marked 8, 4, 2, and 1; the row nearer the edge of the board
(the top one, with the case in its usual upright orientation) is marked
"MSB".  These go through various codes.  Many of them are displayed too
briefly for me to identify them; the ones that remain long enough for
me to identify are (in hex, based on the MSB and 8/4/2/1 markings) are:

Powerup, dd, flicker, dd, flicker, d0, flicker, cd, flicker, 04.

It stays there as long as I've been willing to wait (certainly well
past the time when ARC or SRM would previously have printed something).
The first and third "flicker"s are accompanied by two ticks from the
machine's built-in speaker.  The NUL is printed very early, roughly at
about the time the first dd is displayed; the A is printed at
approximately the time of the last flicker (changing from cd to 04).
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Rhialto | 12 Jun 2011 11:53
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Re: magic switch to ARC console?

On Sun 12 Jun 2011 at 01:16:02 -0400, der Mouse wrote:
> Anyone got any pointers?

I found an SRM manual here, but it doesn't seem to mention the countdown
values.
http://www.compaq.com/AlphaServer/technology/literature/srmcons.pdf

This page seems to imply there was an online service guide, but the link
is dead.
http://h18002.www1.hp.com/alphaserver/workstations/retired/auseries/index.html
ftp://ftp.compaq.com/pub/products/workstations/miatasg.exe

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der Mouse | 13 Jun 2011 01:19

Re: magic switch to ARC console?

Earlier today, I wrote, of my PWS 600au,

> Okay, today I pulled the machine apart, popped out the CPU/memory/etc
> board, and replaced the battery.

> Now it won't enter _either_ console.  [...]

Boy, do I feel stupid now.

I must have had the serial line plugged into the wrong serial port.  It
came up in ARC very nicely on the correct port (and, yes, plugged into
the wrong port I still see the behaviour I described).

And, the new battery does its job.  I switched from ARC to SRM and the
setting survived a power-cycle just fine.  The machine is once again
happily running NetBSD.

My thanks to everyone who replied and my apologies for the noise on the
list when it was really me being boneheaded.

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Matt Thomas | 14 Jun 2011 10:18

Alpha A12 support will be removed soon.


Unless someone (Ross?) can justify why it should stay.
(it hasn't been compiled for a long time).
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