Earlier this month Rob documented this neat trick on how to figure out what address your Linux/390 system was IPLed off of last. While I was getting ready to put this up on the linuxvm.org web site, I thought it would be a nice idea to make this into a shell script so that it would be easy for people to get that information. So, at http://linuxvm.org/patches/s390/iplvol.sh you can find a bash script that does just that.
Due to the nature of the technique, running gdb against /proc/kcore, this can only be done by root. This is because the permissions on /proc/kcore are 400, i.e., -r-------- 1 root root 42115072 Dec 30 00:59 /proc/kcore And, since it requires /proc/subchannel to be present, the script checks to see if you're running on a 2.4 or higher kernel level. Some values for the text parsing are hard-coded, so you may need to adjust them for your system. If so, please let me know so I can see if I can adjust the script to run properly in your environment. Enjoy. Mark Post -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of Rob van der Heij Sent: Tuesday, December 10, 2002 1:55 AM To: [EMAIL PROTECTED] Subject: Re: IPL device number At 20:03 09-12-02 -0500, paultz wrote: >Is there a single command or file somewhere in RH7.2 that will reveal >the device name/number from which the RH7.2 LPAR was IPLed? The subchannel address of your IPL device is stored in 0x10404 during the boot process, so if you have 'gdb' installed it goes like this: gdb -c /proc/kcore display the contents of 10404 x/x 0x10404 quit look for that subchannel address (the rightmost 2 bytes shown in gdb) in the list of devices, like with cat /proc/subchannels Rob
