SL Micro 6.0: Add section on aarch64 console

Signed-off-by: Andreas Färber <afaerber@suse.com>

Author: afaerber

adoc/common/aarch64-console.adoc

@@ -0,0 +1,14 @@
+[NOTE]
+.System default console settings
+====
+System firmware can use two methods for specifying a default console device:
+
+* ACPI Serial Port Console Redirection (SPCR) table.
+This ACPI table may be configurable via system firmware setup menus.
+* FDT `/chosen/stdout-path` property.
+This FDT property may be adjustable, for example, by applying FDT Overlays.
+
+These defaults get overridden by using any `console=` kernel command line options.
+Adding a secondary output device therefore requires manually specifying the
+default console device.
+====

adoc/micro/version60.adoc

@@ -231,6 +231,22 @@ Information in this section applies to {productnameshort} {this-version}.
 
 include::kernel-micro-60-aarch64.adoc[]
 
+[#bsc-1229336]
+=== Default console settings optimized for {rpi}
+
+The {productnameshort} {this-version} {aarch64} images use default kernel
+command line settings tuned for easy evaluation on {rpireg} devices.
+
+For usage with {arm} BSA-compliant servers you will have to edit the
+command line in the GRUB menu:
+
+* Drop `console=ttyS0,115200`. Optionally try `console=ttyAMA0,115200` or similar for serial output, including IPMI Serial-over-LAN via a BMC.
+* Drop `console=tty0` if you don't need the console output on a graphical display.
+
+This behavior will change with {productnameshort} {next-version}.
+
+include::../common/aarch64-console.adoc[]
+
 // :leveloffset: +1