From b2869ed6b82ef4419aa5bb790e6e47c17960c47d Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@etherboot.org>
Date: Mon, 9 May 2005 13:25:43 +0000
Subject: [PATCH] Added explanatory comment.

---
 src/core/buffer.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/core/buffer.c b/src/core/buffer.c
index da75eb65..5254c64e 100644
--- a/src/core/buffer.c
+++ b/src/core/buffer.c
@@ -14,6 +14,13 @@
  * which assemble a file into a single contiguous block.  The whole
  * block is then passed to the image loader.
  *
+ *
+ * Note that the rather convoluted way of manipulating the buffer
+ * descriptors (using copy_{to,from}_phys rather than straightforward
+ * pointers) is needed to cope with operation as a PXE stack, when we
+ * may be running in real mode or 16-bit protected mode, and therefore
+ * cannot directly access arbitrary areas of memory.
+ *
  */
 
 #include "stddef.h"