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AR# 47936

14.3 EDK, MPMC v6.06.a - VFBC underrun causes shifted images


After writing a few lines, the video shifts by a few pixels. How do I resolve this issue?


This is caused by improper throttling of the underlying NPI interface, leading to NPI/MCB FIFO underruns.

For errors resulting from writes, a patch is available for download at the end of this answer record. To use, extract thezipped patch to the EDK project pcores/ directory, and restart XPS. The MPMC is currently not planned to be updated to include this patch.

A similar failure has been observed for read transactions, but there is no patch currently available.


Associated Attachments

Name File Size File Type
ar47824.zip 6 KB ZIP
AR# 47936
Date Created 10/24/2012
Last Updated 03/02/2013
Status Active
Type General Article
  • Multi-Port Memory Controller (MPMC)