none cache area in dtcm or in ocram on IMXRT1176

[nxbg]

Hi Team,

We are confused a little bit about default projects template, the none cache area is defined inside dtcm by default:

as dtcm is very limited so we would like to move the none cache area to part of ocram which is much bigger(NCACHE_REGION):

Here is my flash map:

The dtcm is reaseved for high speed data in our application, and I saw that DTCM have cache setting actually. From my understanding DTCM area have the same speed with MCU, it does not need to have cache setting, correct?

So the first problem is that we are merged ThreadX and NetX duo into our project, if we put none cache area into dtcm, everything works fine, but if we move it to ocram NCACHE_REGION, the ethernet interrupt(ENET_1G_IRQHandler) will not trigger, the code is exactly the same.

Btw: The default netx duo project template from SDK 2.10.1 does not meet this problem, but we indeed checked everything what we can do, but all failed.

Could you give me some suggestions about this? Maybe I forget something important to setting.

Thanks & Best Regards

[jeremyzhou]

Hi,
Thanks for your reply.
1) So even we already set these parameter, actually it does not have any effect, or we can delete them, or just leave it here, correct?
-- Yes, it's correct.
Have a great day,
TIC

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[jeremyzhou]

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) It does not need to have a cache setting, correct?
-- Yes.
2) Could you give me some suggestions about this? Maybe I forget something important to setting？
-- I'd like to know whether you ever modified the NCACHE_REGION on the default evkmimxrt1170_netx_duo_ping as the below figure shows, and did it still works well after modification?
Have a great day,
TIC

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[nxbg]

Hi,

Regarding 1), it does not have any meaning to set cacheable to TCM area, so even we already set these parameter, actually it does not have any effect, or we can delete them, or just leave it here, correct?

Regarding 2), the original project evkmimxrt1170_netx_duo_ping works fine with *(NonCacheable) either located on NCACHE_REGION(OCRAM) or Default(DTCM), we build our own project and merge the imxrt driver inside  evkmimxrt1170_netx_duo_ping, then we find if *(NonCacheable) located on NCACHE_REGION(OCRAM), and the interrupt is not working.

As it is very hard to find a suitable workround to reproduce this issue. We will keep trac this strange issue. Now we will use DTCM as default NonCacheable area.

Thanks for your support!