Port-vax archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: I/O bus reset to fix CMD MSCP controllers (and probably others)
> And now we're having these issues on NetBSD, too. I really wonder
> whether NetBSD might have done a I/O bus reset in the past that went
> missing during some refactoring or rototilling.
Data point: when I boot 1.4T under my emulator, I see only three I/O
resets. One is the emulator resetting itself during startup. The
other two are due to writes to IPR 55, which happen:
- Early in the ROM code (before terminal type detection starts).
- After the "b dua0" command but before the "2..1..0.." prints.
I do not see any others. In particular, I do not see any at any point
between the ">> NetBSD/vax boot ... <<" line and the single-user shell
prompt.
Of course, I also do not know whether 1.4T works with the hardware in
question. But it does indicate that, at one point some time ago,
NetBSD didn't do any explicit I/O resets in that code path.
/~\ The ASCII Mouse
\ / Ribbon Campaign
X Against HTML mouse%rodents-montreal.org@localhost
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
Home |
Main Index |
Thread Index |
Old Index