TMS570LS0714: F021 operation will abort prefetch while allow FIQ interrupt

Vivian(MCU) Zhang

Intellectual 1545 points

Part Number: TMS570LS0714

Hi,

My customer has a problem while using FEE.

If FIQ & IRQ both allowed during FEE operation (using F021 library), it will lead the result of abort prefetch.

Look into the CP15 instruction address, it goes to the memory which is reserved.

And I study the posts on E2E and get the similar question through the link

https://e2e.ti.com/support/microcontrollers/hercules/f/312/p/188798/926522?tisearch=e2e-quicksearch

The conclusion from the post it that F021 library does not support FIQ as it could not used as hardware vector interrupt.

Then I try to set all the interrupt to IRQ, the problem solved. It seems the same question.

But as the post is several years ago and the F021 version mentioned there is V1.51. and I use the latest version 2.1.1. Could the new version support FIQ or still not? Just confirm with you.

Vivian

over 7 years ago

0 Chuck Davenport over 7 years ago

TI__Guru 59540 points

Hi Vivian,

I believe the limitation is still a part oft he FEE requirements since the FIQ support is more of a HW related issue in conjunction with the Flash state machine. I am copying our software lead so he can confirm that my answer or redirect/correct if needed.

0 Prathap over 7 years ago

TI__Genius 14205 points

Hi Vivian,

FEE operations happen in dedicated Bank7, FIQ handlers are placed in Bank0. Only when CPU access happens to the same Bank that is undergoing Flash operation there will be a interrupt stall, if they are happening at two different bank there should be no problem.

As long as Bank7 is not accessed by CPU directly ( only through FEE API's) there should be no problem.

The referenced forum post, does not talk about Bank7, it is Flash operation in Bank0 where FIQ handlers / interrupt Vector table are placed.

0 Vivian(MCU) Zhang over 7 years ago in reply to Prathap

TI__Intellectual 1545 points

Thanks, customer is waiting for the answer and then decide whether to use external EEPROM.

vivian

0 Bob Crosby over 7 years ago in reply to Vivian(MCU) Zhang

TI__Guru 72500 points

Hi Vivian,
Thread you referenced is talking about an issue of using FIQ when erasing bank 0 of flash. The TI FEE does not erase bank 0 so the issue is not the same.

0 Vivian(MCU) Zhang over 7 years ago in reply to Bob Crosby

TI__Intellectual 1545 points

Hi, Bob:

But it looks like very similar, do you have any suggestion? Thanks!

Vivian

0 Bob Crosby over 7 years ago in reply to Vivian(MCU) Zhang

TI__Guru 72500 points

What was the address which caused the prefetch abort?

Arm-based microcontrollers

Arm-based microcontrollers forum

TMS570LS0714: F021 operation will abort prefetch while allow FIQ interrupt