[aravis/register] genicam: add some comments on the register workaround.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit cacb838fa8de36bb434fc9034dd115b3f417d88e
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Mon May 20 21:03:26 2013 +0200

    genicam: add some comments on the register workaround.

 src/arvgcport.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/arvgcport.c b/src/arvgcport.c
index 54ce465..1a02161 100644
--- a/src/arvgcport.c
+++ b/src/arvgcport.c
@@ -67,9 +67,12 @@ arv_gc_port_read (ArvGcPort *port, void *buffer, guint64 address, guint64 length
        genicam = arv_gc_node_get_genicam (ARV_GC_NODE (port));
        device = arv_gc_get_device (genicam);
 
+       /* For schema < 1.1.0 and length == 4, register read must be used instead of memory read.
+        * See Appendix 3 of Genicam 2.0 specification. */
        if (_register_workaround_check (port, length)) {
                guint32 value;
 
+               /* For schema < 1.1.0, all registers are big endian. */
                value = *((guint32 *) buffer);
                value = GUINT32_FROM_BE (value);
 
@@ -92,9 +95,12 @@ arv_gc_port_write (ArvGcPort *port, void *buffer, guint64 address, guint64 lengt
        genicam = arv_gc_node_get_genicam (ARV_GC_NODE (port));
        device = arv_gc_get_device (genicam);
 
+       /* For schema < 1.1.0 and length == 4, register write must be used instead of memory write.
+        * See Appendix 3 of Genicam 2.0 specification. */
        if (_register_workaround_check (port, length)) {
                guint32 value;
 
+               /* For schema < 1.1.0, all registers are big endian. */
                value = *((guint32 *) buffer);
                value = GUINT32_FROM_BE (value);