My PCIE-based GbE controller reports NMI error after ifup command.
Uhhuh. NMI received for unknown reason 20 on CPU 0. Do you have a strange power saving mode enabled? Dazed and confused, but trying to continue
I suspect the Power Management issue?
2>How to deal with the PCIE across 4K boundry issue? Assumption:Max Payload size=256 bytes,DMA base addr=0xc41000,DMA Burst size=32bytes,packet size:64~1536 bytes,datawidth=32bit
my understand:The current DMA burst cann't across the 0x1000 address. it must break the current DMA at 0xFFC,and restart the remain DMA data from 0x1000.
is it?
3>16bit PCIE wrapper of GTP wizard issue. For improving timing to 125M,i have to configure 16bit PCIE wrapper from GTP wizard manually for FPGA prototype.However,i am very puzzle that there are too many parameters to configure for the gtp_dual of pcie tile file. I try to replace the all gtp_dual parameters of pcie tile file with the other PCIE Endpointx1(clk ration:1/2;8bit wrapper) IP without any modify.Two questions:
a> Does any parameter need to be modified for working with 16bit wrapper successful by referenceing the 8bit wrapper?
b>In simulation environment,the return first complete data are ALL 0 after the first Memry Read non-post request.however,all subsequences post/non-post transactions ,or remove the PCIE PHY mode ,or the second same Memry Read non-post request are ok.
why cann't the first data be returned correctly?