3 files changed, 100 insertions, 0 deletions
diff --git a/doc/develop/directories.rst b/doc/develop/directories.rst
new file mode 100644
index 0000000000..112b5655f6
--- /dev/null
+++ b/doc/develop/directories.rst
@@ -0,0 +1,76 @@
+Directory hierarchy
+===================
+
+.. list-table::
+   :header-rows: 1
+
+   * - Directory path
+     - Usage
+   * - /arch
+     - Architecture-specific files
+   * - /arch/arc
+     - Files relating to ARC architecture
+   * - /arch/arm
+     - Files relating to ARM architecture
+   * - /arch/m68k
+     - Files relating to m68k architecture
+   * - /arch/microblaze
+     - Files relating to microblaze architecture
+   * - /arch/mips
+     - Files relating to MIPS architecture
+   * - /arch/nios2
+     - Files relating to Altera NIOS2 architecture
+   * - /arch/powerpc
+     - Files relating to PowerPC architecture
+   * - /arch/riscv
+     - Files relating to RISC-V architecture
+   * - /arch/sandbox
+     - Files relating to HW-independent "sandbox"
+   * - /arch/sh
+     - Files relating to SH architecture
+   * - /arch/x86
+     - Files relating to x86 architecture
+   * - /arch/xtensa
+     - Files relating to Xtensa architecture
+   * - /api
+     - Machine/arch-independent API for external apps
+   * - /board
+     - Board-dependent files
+   * - /boot
+     - Support for images and booting
+   * - /cmd
+     - U-Boot commands functions
+   * - /common
+     - Misc architecture-independent functions
+   * - /configs
+     - Board default configuration files
+   * - /disk
+     - Code for disk drive partition handling
+   * - /doc
+     - Documentation (a mix of ReST and READMEs)
+   * - /drivers
+     - Device drivers
+   * - /dts
+     - Makefile for building internal U-Boot fdt.
+   * - /env
+     - Environment support
+   * - /examples
+     - Example code for standalone applications, etc.
+   * - /fs
+     - Filesystem code (cramfs, ext2, jffs2, etc.)
+   * - /include
+     - Header Files
+   * - /lib
+     - Library routines relating to all architectures
+   * - /Licenses
+     - Various license files
+   * - /net
+     - Networking code
+   * - /post
+     - Power On Self Test
+   * - /scripts
+     - Various build scripts and Makefiles
+   * - /test
+     - Various unit test files
+   * - /tools
+     - Tools to build and sign FIT images, etc.
diff --git a/doc/develop/event.rst b/doc/develop/event.rst
index 6951ec97e7..4ff5934837 100644
--- a/doc/develop/event.rst
+++ b/doc/develop/event.rst
@@ -64,3 +64,26 @@ in an image, use $(CROSS_COMPILE)nm::
 
     nm u-boot |grep evspy |grep list
     00000000002d6300 D _u_boot_list_2_evspy_info_2_EVT_MISC_INIT_F
+
+Logging is also available. Events use category `LOGC_EVENT`, so you can enable
+logging on that, or add `#define LOG_DEBUG` to the top of `common/event.c` to
+see events being sent.
+
+
+Dynamic events
+--------------
+
+Static events provide a way of dealing with events known at build time. In some
+cases we want to attach an event handler at runtime. For example, we may wish
+to be notified when a particular device is probed or removed.
+
+This can be handled by enabling `CONFIG_EVENT_DYNAMIC`. It is then possible to
+call `event_register()` to register a new handler for a particular event.
+
+Dynamic event handlers are called after all the static event spy handlers have
+been processed. Of course, since dynamic event handlers are created at runtime
+it is not possible to use the `event_dump.py` to see them.
+
+At present there is no way to list dynamic event handlers from the command line,
+nor to deregister a dynamic event handler. These features can be added when
+needed.
diff --git a/doc/develop/index.rst b/doc/develop/index.rst
index 79d7736b13..a52ad630d0 100644
--- a/doc/develop/index.rst
+++ b/doc/develop/index.rst
@@ -24,6 +24,7 @@ Implementation
 .. toctree::
    :maxdepth: 1
 
+   directories
    bloblist
    bootstd
    ci_testing