From d1daa4a205589f058faeef9ba93eae7b25ca4dd2 Mon Sep 17 00:00:00 2001
From: Ed <ed@xmos.com>
Date: Thu, 18 Mar 2021 09:17:05 +0000
Subject: [PATCH] Skip verify after sector erase to prevent 5ms delay

---
 lib_dfu/src/dfu.xc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib_dfu/src/dfu.xc b/lib_dfu/src/dfu.xc
index 66b383058..3bf92bfb2 100644
--- a/lib_dfu/src/dfu.xc
+++ b/lib_dfu/src/dfu.xc
@@ -200,8 +200,10 @@ static enum dfu_status getstatus_from_dnload(bool &busy)
 
     case DNLOAD_ERASING_SECTOR:
       if (!flash_is_busy()) {
-        if (!flash_is_sector_erased(dnload.next_page_address))
-          return ERR_CHECK_ERASED;
+        // See https://github.com/xmos/lib_dfu/issues/44
+        // This works around a problem seen where I2C clock stretching for 5ms breaks the DFU process
+        // if (!flash_is_sector_erased(dnload.next_page_address))
+        //   return ERR_CHECK_ERASED;
 
         if (!is_address_in_an_upgrade_slot(dnload.next_page_address))
           return ERR_ADDRESS;