From 06b3e35cc964d4735bd62d293b9d51f689545f97 Mon Sep 17 00:00:00 2001
From: "Suren A. Chilingaryan" <csa@dside.dyndns.org>
Date: Sun, 17 Jul 2011 14:22:32 +0200
Subject: Handle correctly reference counting in the driver

---
 NOTES | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'NOTES')

diff --git a/NOTES b/NOTES
index 4efca52..3f1eadb 100644
--- a/NOTES
+++ b/NOTES
@@ -1,3 +1,12 @@
+Memory Addressing
+=================
+ There is 3 types of addresses: virtual, physical, and bus. For DMA a bus
+ address is used. However, on x86 physical and  bus addresses are the same (on
+ other architectures it is not guaranteed). Anyway, this assumption is still
+ used by xdma driver, it uses phiscal address for DMA access. I have ported
+ in the same way. Now, we need to provide additionaly bus-addresses in kmem
+ abstraction and use it in NWL DMA implementation.
+
 DMA Access Synchronization
 ==========================
  - At driver level, few types of buffers are supported:
-- 
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