binman: Record the parent section of each section

[oweals/u-boot.git] / tools / binman / etype / x86_start16_spl.py

diff --git a/tools/binman/etype/x86_start16_spl.py b/tools/binman/etype/x86_start16_spl.py
index 176420ba88cb790a2873bdd7fb4afe5848d5fb4a..d85909e7ae8e7ac765352971e2cb52837cf08262 100644 (file)
--- a/tools/binman/etype/x86_start16_spl.py
+++ b/tools/binman/etype/x86_start16_spl.py
@@ -9,6 +9,20 @@ from entry import Entry
 from blob import Entry_blob
 
 class Entry_x86_start16_spl(Entry_blob):
+    """x86 16-bit start-up code for SPL
+
+    Properties / Entry arguments:
+        - filename: Filename of spl/u-boot-x86-16bit-spl.bin (default
+            'spl/u-boot-x86-16bit-spl.bin')
+
+    x86 CPUs start up in 16-bit mode, even if they are 64-bit CPUs. This code
+    must be placed at a particular address. This entry holds that code. It is
+    typically placed at offset CONFIG_SYS_X86_START16. The code is responsible
+    for changing to 32-bit mode and starting SPL, which in turn changes to
+    64-bit mode and jumps to U-Boot (for 64-bit U-Boot).
+
+    For 32-bit U-Boot, the 'x86_start16' entry type is used instead.
+    """
     def __init__(self, section, etype, node):
         Entry_blob.__init__(self, section, etype, node)