Chris Johns commented on a discussion on 
embeddedsw/XilinxProcessorIPLib/drivers/emacps/src/xemacps_bdring.c: 
https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/35#note_137807

 >              while (BdCount < BdLimitLoc) {
 >              /* Read the status */
 >                      if(CurBdPtr != NULL){
 >              BdStr = XEmacPs_BdRead(CurBdPtr, XEMACPS_BD_STAT_OFFSET);

Using cache coherent memory is a much better solution. The code I had predates 
support for that type of memory.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/35#note_137807
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