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: a05f87929eed43cef673a8c2581899a8c9ccf462)

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

1 files changed, 8 insertions, 0 deletions

diff --git a/documentation/ref-manual/system-requirements.rst b/documentation/ref-manual/system-requirements.rst
index bf50fc510a..4fe0cb841b 100644
--- a/documentation/ref-manual/system-requirements.rst
+++ b/documentation/ref-manual/system-requirements.rst
@@ -42,6 +42,14 @@ 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.
 
+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.
+
 Supported Linux Distributions
 =============================