TMS570LC4357: Fapi Usage Question

Zonguldak's Rose <3

Part Number: TMS570LC4357
Other Parts Discussed in Thread: RM57L843

Hi,

I wonder that can I use cache when I am using Fapi or FEE functions on tms570lc4357.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/693548/rm57l843-bank-7-programming---fapi_doverify-failing-in-certain-cases?tisearch=e2e-sitesearch&keymatch=fapi%252525252520cache#

In this link above there is an answer about RM57L843 which has same flash module(L2FMC) as TMS570LC4357 and it says accesses to the flash banks must not be cached. If so why there is no caution about this on the F021 FLASH API REFERENCE GUIDE, or TI FEE USER GUIDE.

How should I use the FEE driver for safety applications. If I have to close the cache, what is the reason ? Is it about speed difference between cache and flash ?

over 1 year ago

0 jagadish gundavarapu over 1 year ago

TI__Guru 69701 points

Hi,

I started working on your issue and will provide you an update ASAP.

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Thanks & regards,
Jagadish.

0 Zonguldak's Rose <3 over 1 year ago in reply to jagadish gundavarapu

Prodigy 141 points

Hi,

I'm waiting your answer. Thank you.

+1 jagadish gundavarapu over 1 year ago in reply to Zonguldak's Rose <3

TI__Guru 69701 points

Hi Zonguldak's Rose,

First of all, apologies for the delay in my response, i had a discussion with the software team regarding this issue.

Here is the answer:

You can either enable the cache or disable it and it doesn't affect the FEE functionality. But you should need to make sure one thing if you enable the cache.

If you want to always read the latest data from FEE bank, disable the cache. But if you enable the cache then you should configure the cache write-through for the corresponding FEE region, if we do this then any cache Hit will update both data cache and main memory with the corresponding data. So whenever we read the memory, we can get updated data all the time.

--
Thanks & regards,
Jagadish.

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TMS570LC4357: Fapi Usage Question