Re: Sporadic envstat(8)

[Michael <macallan%netbsd.org@localhost>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,

On Dec 2, 2010, at 5:47 AM, Sad Clouds wrote:

> Hi, on my nettop with Intel Atom D510 CPU, envstat() seems to behave  
> a bit sporadically. If I boot the machine from cold and run  
> envstat() it reports no drivers registered. However if I let the  
> machine run for a few minutes and reboot it, then envstat() reports  
> CPU temperature.
>
> Anyone knows why NetBSD envsys does not pick up temperature sensors  
> when booting from cold?

Which driver is it? One possibility would be that the sensor takes a  
while to (literally) warm up and provide valid output which an over  
eager driver might interpret as malfunction and therefore doesn't  
attach.
I've seen this with the built-in thermal sensor in PowerPC G3 CPUs -  
up to a few minutes after power up it reads temperatures barely above  
freezing.

have fun
Michael

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (Darwin)

iQEVAwUBTPeTkcpnzkX8Yg2nAQJfngf9FsQH6dA66Eo2o2Chm9hHkCcCpcqdK8T8
WWHIfC3pvAKRlvE67vfTTnVtjQrxfv78Igu8Y9oB1dOos1KBF4HdT5L7QeFhlogg
xUAoaGKxM03uQT2/P5NvtCTb+Ld8+t+udptTr2hxCAkq8gz6Fpdmz5HyVcMZjzTU
PfkYKrsEs11B80DeXtggx5JdHYYywJ6GKQ7vZUwiDKwlfjCtQyPxWMMT17iFimv/
iPyKksbPU/QT6coOg0R11an/rW+3RUp6SS9tzrhvu/O/AZTI0F+WV98sDiOO+w50
da94DcvNWYtaT4jGAg6cojig+AL6KiKrgrFuyVa6l5LWZN3vm233vA==
=znAa
-----END PGP SIGNATURE-----