manuals: add minimum RAM requirements

Measured by generating a "core-image-sato" image for a "qemux86-64"
machine from an Ubuntu 22.04 VM with 4 cores.

Less memory was not enough and caused Out of Memory failures.

(From yocto-docs rev: 5009d3898a1649074d1fc252ed33ecbf3235ed75)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

3 files changed, 18 insertions, 0 deletions

diff --git a/documentation/brief-yoctoprojectqs/index.rst b/documentation/brief-yoctoprojectqs/index.rst
index 565e00be2e..462c942961 100644
--- a/documentation/brief-yoctoprojectqs/index.rst
+++ b/documentation/brief-yoctoprojectqs/index.rst
@@ -51,6 +51,10 @@ following requirements:
    much more will help to run multiple builds and increase
    performance by reusing build artifacts.
 
+-  At least &MIN_RAM; Gbytes of RAM, though a modern modern build host with as
+   much RAM and as many CPU cores as possible is strongly recommended to
+   maximize build performance.
+
 -  Runs a supported Linux distribution (i.e. recent releases of Fedora,
    openSUSE, CentOS, Debian, or Ubuntu). For a list of Linux
    distributions that support the Yocto Project, see the
diff --git a/documentation/poky.yaml.in b/documentation/poky.yaml.in
index 1d4e176604..8c6549d571 100644
--- a/documentation/poky.yaml.in
+++ b/documentation/poky.yaml.in
@@ -48,3 +48,7 @@ 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"
+# Disk space (Gbytes) needed to generate qemux86-64 core-image-sato on Ubuntu 22.04 (x86-64) with "rm_work", rounded up from 38
+MIN_DISK_SPACE_RM_WORK : "40"
+# RAM (Gbytes) needed to generate qemux86-64 core-image-sato on Ubuntu 22.04 (x86-64) on a 4 core system
+MIN_RAM : "8"
diff --git a/documentation/ref-manual/system-requirements.rst b/documentation/ref-manual/system-requirements.rst
index 72579a5e23..92e2211629 100644
--- a/documentation/ref-manual/system-requirements.rst
+++ b/documentation/ref-manual/system-requirements.rst
@@ -40,6 +40,16 @@ 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.
 
+.. _system-requirements-minimum-ram:
+
+Minimum System RAM
+==================
+
+You will manage to build an image such as ``core-image-sato`` for the
+``qemux86-64`` machine with as little as &MIN_RAM; Gbytes of RAM on an old
+system with 4 CPU cores, but your builds will be much faster on a system with
+as much RAM and as many CPU cores as possible.
+
 .. _detailed-supported-distros:
 
 Supported Linux Distributions