cache issue with lwip stack

[yosri_c]

hi folks 

i'm currently working on integrating lwip stack in our project and we noticed that everything runs well server side  until we enable the cahce in mpu config , we looked around and found out that there's an issue with DCACHE and both rxbuffer and txbuffer shouldn't be allocated in cached region so we went ahead and set some NCACHE region in SDRAM and made sure those buffers reside well in there but no response when enabling cache 

 

is there anything else we're missing ?

[yosri_c]

not no USB yet , just using flexSPI for XIP boot from flash NOR and ethernet (LWIP+embedtls) for web server and ADC for ADE measurments  but no other peripherals

[EdwinHz · Accepted solution]

Hi again @yosri_c,

In this case, yes, the issue is only due to the rx and tx buffer compatibility. Please place these buffers on the NCACHE region.

BR,
Edwin.

[EdwinHz]

Hi @yosri_c,

What other peripherals are you using in your application? Do you happened to use USB as well?

BR,
Edwin.