[PATCH website v1 3/5] doc: mark old PowerPC and ARM build examples as historical

From: guang feng wang <[email protected]>

Some architecture-specific build examples still describe old boards,
toolchains and kernel versions.

Keep these examples as historical references, but make it clear that new
Cobalt setups should follow the current Dovetail-based installation flow.

Signed-off-by: guang feng wang <[email protected]>
---
 content/installation/_index.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/content/installation/_index.md b/content/installation/_index.md
index 265cb5a..4eaafcb 100644
--- a/content/installation/_index.md
+++ b/content/installation/_index.md
@@ -737,6 +737,11 @@ The remaining examples illustrate how to cross-compile Xenomai for
 various architectures. Of course, you would have to install the proper
 cross-compilation toolchain for the target system first.
 
+Some of the architecture-specific examples below are kept as historical
+references for older boards, toolchains and kernel versions. For new
+Cobalt setups, use the current Dovetail-based installation flow and
+adjust the toolchain and configuration to the target platform.
+
 ### Building the PPC32 libraries
 
 A typical cross-compilation setup, in order to build the Cobalt
-- 
2.34.1