Re: [ts-7000] Re: Help me to write a C code for read temperarutere on TS-7200 (NetBSD 3.1)

[Andres Gomez <>]

Thanks for your tips. Finally, I can run the program tempSensor on NetBSD. The problem is that I can only run in single-user mode. I tried to set the securelevel to 0, but when at the final moment to switch to multiuser-mode change it to 1 and I can not change it again. I have managed to "hack" this by changing the last line of /etc/rc file, where it says "exit 0" to "exit 1", for run a tempsensor as daemon (a program in foreground with an infinite loop while you record the temperature in a file, for example: /tmp/temp.tmp), but this is not very elegant and also lose features such as: login, and so on.
How can I change the securelevel to 0 when the kernel was compiled without this option? Or how can access to /dev/mem with securelevel in 1? The parameter kern.mapped_files is set to 1. I need some form of access to the mapping of memory, any idea how to do it please?

--- El sÃb 8-nov-08, charliem_1216 <> escribiÃ:

De: charliem_1216 <>
Asunto: [ts-7000] Re: Help me to write a C code for read temperarutere on TS-7200 (NetBSD 3.1)
Para:
Fecha: sÃbado, 8 de noviembre de 2008, 4:15 am

--- In .com, Andres Gomez <andres.gomez08@ ...>
wrote:
>
> yes, Charlie, this is the point, but when I try to set securelevel
in -1 or 0 it shows this message:
> # sysctl -w kern.securelevel= -1
> sysctl: kern.securelevel: sysctl() failed with Operation not
permitted

Yes, I understand that only the init process can *reduce*
securelevel

> At moment, my securelevel is 1, I read that I init from
single-user mode the securelevel is 0...I'll try to run my temp
sensor script (which write /dev/mem). The kernel compiled in the
official NetBSD FTP for 3.1 release has compiled with OPTION
INSECURE (without adding `option INSECURE' in the kernel
configuration file) and I don't know how to decrease this level
to -1 or 0.

Single user mode should be 0 as you said, so you can at least test
the usermode linux-style program there.

Being curious, I just downloaded netBSD 3.1.1 (i386), and brought it
up. By default, my securelevel is -1 already in multiuser mode.
Sounds like ARM is different. You can add "securelevel= -1"
to /etc/rc.config, if you want to boot that way and the kernel
allows it. You may have to rebuild the kernel to allow it though.

Also, look at the kernel.mapped_ files sysctl value. It will tell
you if your system offers memory mapped files. My i386 test system
shows kernel.mapped_ files=1; ARM should be the same.

>
> Other options perphaps is call to my script on /etc/rc file at
start process before change de securelevel from 0 to 1.

Maybe, but that would just tell you the temperature one time, at
boot.

Regards, ......... Charlie

> What do you say Charlie?
> &#65533;
>
> --- El jue 6-nov-08, charliem_1216 <charliem_1216@ ...> escribiÃÂ:
> De: charliem_1216 <charliem_1216@ ...>
> Asunto: [ts-7000] Re: Help me to write a C code for read
temperarutere on TS-7200 (NetBSD 3.1)
> Para: .com
> Fecha: jueves, 6 de noviembre de 2008, 5:26 pm
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> --- In .com, Andres Gomez
<andres.gomez08@ ....> wrote:
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> >
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> > It isn't so simple, Charlie. The Linux code tempSensor.c don't
run
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> on NetBSD, I tried it. I reed the Datasheet
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> Andres,
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> What is the error when you run the linux tempSensor code? Have
you
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> traced it?
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> Note that to be able to open /dev/mem you probably must change the
>
> netBSD secure level, as described here:
>
> http://wiki. netbsd.se/ Kernel_secure_ levels
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> Once you can open /dev/mem and mmap it as needed, I don't see why
the
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> linux userspace approach won't work.
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> Regards, ......... Charlie
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