usb code run on sdram failed in rt1170

[jingyangxie]

I have a imxrt1170 board, want to run code on sdram, when I debug with iar 9.30，the usb does not work correctly , but when I debug the code on ram , it works fine. the two link files are attachments

[jingpan]

Hi @jingyangxie ,

Please refer to these post.

https://community.nxp.com/t5/i-MX-RT-Knowledge-Base/Using-NonCached-Memory-on-i-MXRT/ta-p/1183369

https://community.nxp.com/t5/i-MX-RT/USB-Host-enumeration-fails/m-p/1436138

https://community.nxp.com/t5/MCUXpresso-IDE/Running-and-debugging-program-in-SDRAM/m-p/1405167

Regards,

Jing

[jingyangxie]

Hi,

I've follow these posts, and add definition DATA_SECTION_IS_CACHEABLE=1,  and the link file set the noncache region: 

after these ,the usb code debug on sdram still can not work

[jingpan]

Hi @jingyangxie ,

Most of these kinds of problem is caused by cache. Please check carefully if the buffers used by both CPU and USB DMA are allocated in noncacheable area. I also suggest to put heap and stack in noncacheable area too.

Regards,

jing

[jingyangxie]

ok, I will check it carefully.thanks