Skip to content

Update device-tree.adoc #2506

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
May 11, 2022
Merged

Update device-tree.adoc #2506

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
2f50ec5
Update device-tree.adoc
agners Apr 11, 2022
e9b4448
Update documentation/asciidoc/computers/configuration/device-tree.adoc
agners Apr 11, 2022
eebd347
Update documentation/asciidoc/computers/configuration/device-tree.adoc
agners Apr 12, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion documentation/asciidoc/computers/configuration/device-tree.adoc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -980,7 +980,7 @@ This sets an (exclusive) limit to the loaded device tree. By default the device
If non-zero, turn on some extra logging for the firmware's device tree processing.

`enable_uart`
Enable the primary/console xref:configuration.adoc#configuring-uarts[UART] (ttyS0 on a Raspberry Pi 3, ttyAMA0 otherwise - unless swapped with an overlay such as miniuart-bt). If the primary UART is ttyAMA0 then enable_uart defaults to 1 (enabled), otherwise it defaults to 0 (disabled). This is because it is necessary to stop the core frequency from changing which would make ttyS0 unusable, so `enable_uart=1` implies core_freq=250 (unless force_turbo=1). In some cases this is a performance hit, so it is off by default.
Enable the primary/console xref:configuration.adoc#configuring-uarts[UART] (ttyS0 on a Raspberry Pi 3, 4, 400, Zero W and Zero 2 W, ttyAMA0 otherwise - unless swapped with an overlay such as miniuart-bt). If the primary UART is ttyAMA0 then `enable_uart` defaults to 1 (enabled), otherwise it defaults to 0 (disabled). This is because it is necessary to stop the core frequency from changing which would make ttyS0 unusable, so `enable_uart=1` implies `core_freq=250` (unless `force_turbo=1`). In some cases this is a performance hit, so it is off by default.

`overlay_prefix`
Specifies a subdirectory/prefix from which to load overlays - defaults to "overlays/". Note the trailing "/". If desired you can add something after the final "/" to add a prefix to each file, although this is not likely to be needed.
Expand Down