“Error: Boot loader didn’t return any data” when booting up Xen guest

Error: Boot loader didn’t return any data I have come across this error two or three times before, and each time I spend hours trying to figure out how to get my virtual machine to boot.  This blog post is just to document a fix so that I can refer back to it, and hopefully it will help people out if they’re experiencing the issue as well.

Debugging NSNotifications on iOS

For iOS developers, this is a really cool technique.  Sometimes you want to see all the NSNotifications that get posted in your app, whether it is for debugging, or to see the timing of where listeners can be hooked in.  Using breakpoints in Xcode will allow us to inspect the notifications. Follow this procedure to set it up: In Xcode, open the breakpoints panel on the left sidebar. Click the + icon at the bottom left of the panel.  Select “Add Symbolic Breakpoint…“ Enter the following details: Symbol: -[NSNotificationCenterpostNotificationName:object:userInfo:] Click Add Action and enter the following details: Debugger Command: po Continue Reading