From 098292a22b62229c54a828389f285b2b510c2f0a Mon Sep 17 00:00:00 2001
From: sebastianpetersFAU
 <43993892+sebastianpetersFAU@users.noreply.github.com>
Date: Tue, 18 Oct 2022 13:18:02 +0200
Subject: [PATCH] incorporate array offset into descriptors

Array offset was ignored when filling out descriptors but was used properly when checking for alignment.
See https://github.com/Xilinx/PYNQ/issues/1392
---
 pynq/lib/dma.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pynq/lib/dma.py b/pynq/lib/dma.py
index 1857149e5..e2cc3f355 100644
--- a/pynq/lib/dma.py
+++ b/pynq/lib/dma.py
@@ -410,9 +410,9 @@ def transfer(self, array, start=0, nbytes=0, cyclic=False):
             remain -= d_len
 
             # Buffer address (64-bit)
-            self._descr[i, 2] = (array.physical_address + (i * blk_size)) & 0xFFFFFFFF
+            self._descr[i, 2] = (array.physical_address + start + (i * blk_size)) & 0xFFFFFFFF
             self._descr[i, 3] = (
-                (array.physical_address + (i * blk_size)) >> 32
+                (array.physical_address + start + (i * blk_size)) >> 32
             ) & 0xFFFFFFFF
 
             # First block