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Re: port-sparc64/54211: esiop stopped detecting boot disk

On Thu, 14 Nov 2019, Michael L. Hitch wrote:

I noticed that sparc64 switched from gcc6 to gcc7 back in Februrary, so my first wild guess is something in gcc7 may be causing the problem. There were no noticable changes in the mpt code between NetBSD-8 and NetBSD-9, so I don't know if the problem is in the mpt code, or something else it uses.

I will probably try this again with an older tree that still has gcc6 and I can try with both versions). I was doing that a year ago when I was having trouble with the Ultra 45 crashing while configuring the audio driver.

I had time over the Thanksgiving weekend to track this down. I did determine that the switch to gcc7 did not cause this, and the commit that did was a few weeks later. The culprit is revision 1.69 of sys/i2c/i2c.c (certainly not very obvious).

That change resulted in the device probe trying to configure a non-existant i2c device on the Ultra 45. Inspecting the dmesg output in this ticket shows the same thing. A working kernel shows:

[   1.0000000] gpio at iic0 addr 0x18 not configured

  While a failing kernel shows:

[ 1.0000000] admtemp0 at iic0 addr 0x18: temperature sensor: id. 0xf0, rev. 0xf0

Reverting this change results in a working kernel. both for -current and netbsd-9.


Michael L. Hitch              
Operations Consulting,  University Information Technology
Montana State University, Bozeman, MT     USA

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