From f222f2ef1e68ec528148de2bf32eb256fa00db4f Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Thu, 20 Feb 2014 06:55:35 +1100
Subject: [PATCH] DataFlash: fixed logging on PX4v1

large writes break IO, a NuttX bug
---
 libraries/DataFlash/DataFlash_File.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libraries/DataFlash/DataFlash_File.cpp b/libraries/DataFlash/DataFlash_File.cpp
index 7d2b09621b..afa60e19b9 100644
--- a/libraries/DataFlash/DataFlash_File.cpp
+++ b/libraries/DataFlash/DataFlash_File.cpp
@@ -42,7 +42,12 @@ DataFlash_File::DataFlash_File(const char *log_directory) :
     _log_directory(log_directory),
     _writebuf(NULL),
     _writebuf_size(16*1024),
+#ifdef CONFIG_ARCH_BOARD_PX4FMU_V1
+    // V1 gets IO errors with larger than 512 byte writes
+    _writebuf_chunk(512),
+#else
     _writebuf_chunk(4096),
+#endif
     _writebuf_head(0),
     _writebuf_tail(0),
     _last_write_time(0)