From 925ce44a6c870710070d30ff4d1e962b9ea361a3 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Fri, 17 Jan 2020 15:58:30 +1100
Subject: [PATCH] HAL_ChibiOS: use 4k bouncebuffer for sdcard

match AP_Logger IO size
---
 libraries/AP_HAL_ChibiOS/sdcard.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_HAL_ChibiOS/sdcard.cpp b/libraries/AP_HAL_ChibiOS/sdcard.cpp
index 9906dec0a5..7fbd64a292 100644
--- a/libraries/AP_HAL_ChibiOS/sdcard.cpp
+++ b/libraries/AP_HAL_ChibiOS/sdcard.cpp
@@ -56,7 +56,9 @@ bool sdcard_init()
 #if HAL_USE_SDC
 
     if (SDCD1.bouncebuffer == nullptr) {
-        bouncebuffer_init(&SDCD1.bouncebuffer, 512, true);
+        // allocate 4k bouncebuffer for microSD to match size in
+        // AP_Logger
+        bouncebuffer_init(&SDCD1.bouncebuffer, 4096, true);
     }
 
     if (sdcard_running) {