doc/relnotes/4.13: Add changes to log-level configurability

Change-Id: Ia7ef57d20ea5099f344ccbf58d76597cb0e82c85
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47669
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/releases/coreboot-4.13-relnotes.md b/Documentation/releases/coreboot-4.13-relnotes.md
index c9447a3f16..7c7102b844 100644
--- a/Documentation/releases/coreboot-4.13-relnotes.md
+++ b/Documentation/releases/coreboot-4.13-relnotes.md
@@ -110,6 +110,18 @@ bridges.
 Exceptional cases, that may still need early bus master enabling in the future,
 should get their own per-reason Kconfig option. Ideally before the next release.
 
+### Early runtime configurability of the console log level
+
+Traditionally, we didn't allow the log level of the `romstage` console
+to be changed at runtime (e.g. via `get_option()`). It turned out that
+the technical constraints for this (no global variables in `romstage`)
+vanished long ago, though. The new behaviour is to query `get_option()`
+now from the second stage that uses the console on. In other words, if
+the `bootblock` already enables the console, the `romstage` log level
+can be changed via `get_option()`. Keeping the log level of the first
+console static ensures that we can see console output even if there's
+a bug in the more involved code to query options.
+
 ### Add significant changes here
 
 Deprecations