site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Cheers Godfrey On Feb 9, , at 11:05, Garth Cummings wrote: Hi David, On Feb 9, 2005, at 10:21 AM, David Osguthorpe wrote: Anybody know if the kernel hooks in the IOKit for the NVRAM allow for the creation of such a program? Neither of these will affect when the kernel will next read NVRAM. It makes for difficult cluster management if you have to reboot the nodes just to udpate the nvram variables --gc __________________________________________________________________ Garth Cummings Apple Developer Technical Support gcummings@apple.com http://developer.apple.com/technicalsupport _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/gvdl%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... Finally I might add that I have recently discovered the sysctl for allowing dynamic modification of boot arguments. This stuff is fairly easy to do, You may want to use bug-reporter to file an enhancement request. Are you guys building your own kernel? If so we may be able to work out a sysctl to allow the setting of the 'boot-args' in the kernels current state. On Tue, Feb 08, 2005 at 03:12:11PM -0800, Shantonu Sen wrote: You are most likely running the nvram(8) commandline tool and not rebooting. The core dumping settings will not be honored (they are only parsed at startup) and the settings will not be preserved. Is there no way to force the nvram update without rebooting? The issue is not that NVRAM requires a reboot to be changed. It doesn't. The NVRAM has indeed been updated once you've run the nvram command. The issue is that the kernel only reads the changed variables out of NVRAM at boot time. Is the NVRAM memory mapped into the kernel such that the bsd kvm_read/kvm_write calls can be used to update the NVRAM? A valid point. But if you've panicked, you have to reboot anyway. You can save one reboot by updating NVRAM using the Open Firmware UI, but that requires you to be physically present at the server. There are a few Technical Q&As showing how to update the config variables using the OFUI. David This email sent to gvdl@apple.com This email sent to site_archiver@lists.apple.com