On Tue, 2003-09-09 at 15:13, Marshal Newrock wrote:
> >
> > Or do I need to add the c option since it says make a 'character' special
> > file?
> >
> > mknod /dev/rtc c 10 135
>
> You have the command written correctly the second time. However, as
> Gentoo defaults to using devfs, you shouldn't have to manually create a
> /dev entry. But you still have the options of: 1) Compile enhanced RTC
> support into your kernel (or as module), 2) find what wants enhanced RTC
> support and don't use it, or 3) ignore the error.
Thank you Marshal. This would probably explain why my last kernel (for
which I somehow lost the .config file...) didn't have the problem. If I
compiled in enhanced rtc support the last time, then Gentoo would have
created whatever it needed in terms of /dev/rtc and there was no
complaint. If that's the case, then I'll first do a new kernel and see
if the messages just go away.
(And I'll stick a copy of my .config on another machine as a back up...)
>
> > QUESTION 2: Is there a way to see the major and minor numbers, along with
> > the type of device an existing character or block special file is once it
> > exists in /dev? I cannot find the sort of intuitive 'lsnod' command. How
> > does one make sure that the major minor numbers don't trample on each other?
>
> It's simpler than you think. 'ls -l /dev' shows you what it is. The
> first letter of the permissions is b for block device, c for character
> device, or l for symlink. If it's a symlink, then you have to look at
> what it links to. But then, you'll see two numbers (a, b) in the size
> field. This is the major, minor numbers.
crw-r--r-- 1 root root 1, 9 Dec 31 1969 urandom
So this is a character special device, major number 1, minor number 9
which matches the info in devices.txt:
1 char Memory devices
1 = /dev/mem Physical memory access
<SNIP>
9 = /dev/urandom Faster, less secure random number gen.
Thanks!
Mark
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