manuals: update disk space requirements

Tests made on Poky master on March 16, 2023.

Add a "Free Disk Space" section to the "System Requirements" document.

(From yocto-docs rev: 285ba689ce3ab7b7fdb4bb0d0284e2a52ad62c7f)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 16 insertions, 1 deletions

diff --git a/documentation/brief-yoctoprojectqs/index.rst b/documentation/brief-yoctoprojectqs/index.rst
index 7b8baf233a..07e95ee85c 100644
--- a/documentation/brief-yoctoprojectqs/index.rst
+++ b/documentation/brief-yoctoprojectqs/index.rst
@@ -40,7 +40,9 @@ Compatible Linux Distribution
 Make sure your :term:`Build Host` meets the
 following requirements:
 
--  50 Gbytes of free disk space
+-  At least &MIN_DISK_SPACE; Gbytes of free disk space, though
+   much more will help to run multiple builds and increase
+   performance by reusing build artifacts.
 
 -  Runs a supported Linux distribution (i.e. recent releases of Fedora,
    openSUSE, CentOS, Debian, or Ubuntu). For a list of Linux
diff --git a/documentation/poky.yaml.in b/documentation/poky.yaml.in
index 30e1050824..7810b8d2a5 100644
--- a/documentation/poky.yaml.in
+++ b/documentation/poky.yaml.in
@@ -41,3 +41,5 @@ MIN_TAR_VERSION : "1.28"
 MIN_GIT_VERSION : "1.8.3.1"
 MIN_GCC_VERSION : "7.5"
 MIN_MAKE_VERSION : "4.0"
+# Disk space (Gbytes) needed to generate qemux86-64 core-image-sato on Ubuntu 22.04 (x86-64), rounded up from 87
+MIN_DISK_SPACE : "90"
diff --git a/documentation/ref-manual/system-requirements.rst b/documentation/ref-manual/system-requirements.rst
index 0fbe3f12c8..bf50fc510a 100644
--- a/documentation/ref-manual/system-requirements.rst
+++ b/documentation/ref-manual/system-requirements.rst
@@ -31,6 +31,17 @@ and conceptual information in the :doc:`/overview-manual/index`.
 
 .. _detailed-supported-distros:
 
+Minimum Free Disk Space
+=======================
+
+To build an image such as ``core-image-sato`` for the ``qemux86-64`` machine,
+you need a system with at least &MIN_DISK_SPACE; Gbytes of free disk space.
+However, much more disk space will be necessary to build more complex images,
+to run multiple builds and to cache build artifacts, improving build efficiency.
+
+If you have a shortage of disk space, see the ":doc:`/dev-manual/disk-space`"
+section of the Development Tasks Manual.
+
 Supported Linux Distributions
 =============================