doc: nrf: releases: Clarify supplicant switch to kernel heap

We have recieved a few queries about the increase in kernel heap usage when migrated to 2.9.0 from 2.7.0, so, add a couple of notes to clarify the same. Signed-off-by: Chaitanya Tata <[email protected]>
nrfconnect · Jan 29, 2025 · 8f248ed · 8f248ed
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diff --git a/doc/nrf/releases_and_maturity/migration/migration_guide_2.8.rst b/doc/nrf/releases_and_maturity/migration/migration_guide_2.8.rst
@@ -76,6 +76,8 @@ nRF70 Series
        For example, ``CONFIG_WPA_SUPP=y`` to ``CONFIG_WIFI_NM_WPA_SUPPLICANT=y``.
        Update your application configurations to use the new namespace.
 
+     * You need to reconcile the application heap and kernel heap usage appropriately to accommodate this switch from application to kernel heap.
+
    * The SR co-existence feature should now be explicitly enabled using the :kconfig:option:`CONFIG_NRF70_SR_COEX` Kconfig option.
      The RF switch feature should be enabled using the :kconfig:option:`CONFIG_NRF70_SR_COEX_RF_SWITCH` Kconfig option.
 

diff --git a/doc/nrf/releases_and_maturity/releases/release-notes-2.8.0.rst b/doc/nrf/releases_and_maturity/releases/release-notes-2.8.0.rst
@@ -486,6 +486,7 @@ Wi-Fi
 
   * The WPA supplicant is now switched to Zephyr upstream's fork instead of |NCS|.
   * The WPA supplicant now uses ``kernel heap`` instead of ``application (libc) heap``.
+    - This means there is an increase in the kernel heap usage but a corresponding decrease in the application heap usage.
 
 Applications
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