Hardware Reference
In-Depth Information
Figure 3-3:
he result of a
successful test
of the network,
using the ping
command
The Emergency Kernel
he Linux kernel is the heart of the operating system that drives the Pi. It's responsible for
everything from making sure that you can access your iles to allowing programs to talk to
other programs.
When switched on, your Pi will load the normal, default kernel. here's also a second kernel
included in most distributions, which sits unused. his is the emergency kernel , and as the
name suggests, it is typically used only when the normal kernel isn't working.
It's highly unlikely that you'll ever need to boot a Pi using the emergency kernel, but it's
worth learning how to do so just in case. his is especially important if you're upgrading your
kernel or are using a new and potentially poorly tested distribution. Sometimes, newly-
released software can have bugs which aren't spotted before its release. When encountering
strange errors after upgrading, the emergency kernel can be used to narrow down the prob-
lem to the new kernel version.
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