On Fri, Aug 13, 2004 at 08:33:48AM +0200, Sven Luther wrote: > On Fri, Aug 13, 2004 at 12:13:20AM +0200, Thomas Poindessous wrote: > > Hi, > > > > I'm trying to add smp detection for Bug#265098 > > > > I'm looking for a way to detect smp system with current d-i powerpc > > kernel and d-i tools. > > > > If you know such a trick, I will be glad to know it. > > I think the easiest way would be to look in the /proc/device-tree, for the > info given to you by the OF. This naturally will probably only work on > newworld and chrp, not sure about oldworld and prep SMP boxes. > > Anyway, on my pegasos2/G4, i have : > > $ ls /proc/device-tree/cpus/ > #address-cells #cpus linux,phandle name PowerPC,74x7 #size-cells > > Presumably you have two processor nodes on SMP boxes. > > Also, another way would (maybe) to look at the content of #cpus : > > $ hexdump /proc/device-tree/cpus/#cpus > 0000000 0000 0001 > 0000004 > > So, on my box, #cpus will contain 1, and presumably on SMP boxes, it will > contain 2 or more. I have not tested this, but please check on your system.
I hear that : 1) older models may have /proc/device-tree/cpu only. 2) /proc/device-tree/cpus/#cpus does not exist on G5 boxes. 3) best would be to count the directories in /proc/device-tree/cpu or /proc/device-tree/cpus. early G5 and maybe some other boxes may have a bug though which make the second cpu node appear in the cpu node. Here is a smallish irc excerpt about this issue : 08:49 < benh> [EMAIL PROTECTED]:/proc/device-tree$ ls -l cpus/ 08:49 < benh> total 4 08:49 < benh> -r--r--r-- 1 root root 4 Aug 13 16:42 #address-cells 08:49 < benh> -r--r--r-- 1 root root 4 Aug 13 16:42 #size-cells 08:49 < benh> dr-xr-xr-x 3 root root 0 Aug 13 16:42 PowerPC,970 08:49 < benh> dr-xr-xr-x 3 root root 0 Aug 13 16:42 PowerPC,970 08:49 < benh> -r--r--r-- 1 root root 4 Aug 13 16:42 linux,phandle 08:49 < benh> -r--r--r-- 1 root root 5 Aug 13 16:42 name 08:54 < owen-pb> [EMAIL PROTECTED] cpus]$ find . -type d 08:54 < owen-pb> . 08:54 < owen-pb> ./PowerPC,970 08:54 < owen-pb> ./PowerPC,970/PowerPC,970 08:54 < owen-pb> ./PowerPC,970 08:54 < owen-pb> ./PowerPC,970/PowerPC,970 08:51 < svenl> owen-pb: you have a SMP box ? 08:51 < owen-pb> svenl: yup $ find . -type d . ./PowerPC,74x7 ./PowerPC,74x7/l2-cache ./PowerPC,74x7/l3-cache Hope this helps. Friendly, Sven Luther
