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Problem with sample lwip and OCRAM

Question asked by samsaprunoff on Dec 16, 2019
Latest reply on Dec 18, 2019 by samsaprunoff

Good day All,

I have imported the RT1021's SDK lwip_udpecho_bm example and this works fine with the original settings (e.g Flash and SRAM_DTC).  However, as I added more functionality I ran out of DTC ram and so I modified the project mcu settings such that the SRAM_OCRAM was used (e.g. moved SRAM_OCRAM up in the MCU Settings).  The application compiled fine and revealed that indeed the OCRAM was being used:


Memory region         Used Size  Region Size  %age Used
     BOARD_FLASH:       95888 B         8 MB      1.14%
         SRAM_OC:       62528 B       128 KB     47.71%
        SRAM_DTC:          88 B        64 KB      0.13%
        SRAM_ITC:          0 GB        64 KB      0.00%
     BOARD_SDRAM:          0 GB        32 MB      0.00%
Finished building target: evkmimxrt1020_lwip_udpecho_bm.axf


When I rerun the application it does not respond to UDP packets.  if I ping the target most times the pings do not respond and if they do it only responds to 2 pings and then no more.


Before I start digging into this further I thought I would ask to see if anyone has come across this issue and why does it only become a problem when OCRAM is used?


Thanks in advance!