Hardware Settings-Config.txt - Raspberry Pi A User Manual

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Hardware Settings—config.txt
The Pi's hardware is controlled by settings contained in a file called
in the
outputs, and at what speed the BCM2835 chip and its connected memory module should run.
Figure 7-3:
The contents of
the /boot
directory, with
config.txt
highlighted
If you're having problems with graphics output, such as the image not filling the screen or
spilling over the edge,
empty or, on some distributions, simply not present; this just means that the Pi will operate
using its pre-set defaults. If you want to make changes and the file isn't there, just create a
new text file called
The
of the way the central processing unit (CPU) and graphics processing unit (GPU) sections of
the BCM2835 apportion the memory. You'll learn how to alter that split in the "Memory
Partitioning" section, later in this chapter.
The
the Pi is running won't take effect until the system is restarted, or switched off and back on
again. In the event that the changes are unwanted, simply deleting the file from the
directory should be enough to restore the defaults once more. If the Pi won't boot with your
new settings, just remove the SD card and delete
another PC, and then reinsert the card into the Pi and try again.
P A R T I
directory (see Figure 7-3). This file tells the Pi how to set up its various inputs and
/boot
config.txt
config.txt
file can control almost all aspects of the Pi's hardware, with the exception
config.txt
file is only read when the system first starts up. Any changes made while
config.txt
C O N N E C T I N G T H E B O A R D
is where you'll be able to fix it. Normally, the file is
and fill in the settings you want to change.
config.txt
, which is located
config.txt
/boot
from the partition on
boot