topic Re: S32K3: about AC_load_on_Job_Start in S32K

S32K3: about AC_load_on_Job_Start

Jojo_Hu — Wed, 25 Jun 2025 03:26:22 GMT

1. According to the referrence manual, we need to enable AC_load_on_Job_Start to avoid RWW problems.

But when I enabled it as below picture, Fls_ACWriteSize and Fls_ACWriteRomStart are still undefined (the same as Fls_ACEraseSize and Fls_ACEraseRomStart).

so how to solve this problem please ?

2. If AC_load_on_Job_Start is disabled and both Write and Erase are in Async mode, can the code flash block be writing/erasing while data flash be writing/erasing ?

Looking forward to your support, thank you!

Re: S32K3: about AC_load_on_Job_Start

lukaszadrapa — Fri, 27 Jun 2025 12:02:17 GMT

Hi @Jojo_Hu

1. Which RTD version is that?

2. Read-While-Write is supported between flash blocks. For example, the code can run from code flash while data flash is being programmed or erased. Notice that only one program or erase operation can run at a time.

Regards,

Lukas

Re: S32K3: about AC_load_on_Job_Start

Jojo_Hu — Sun, 29 Jun 2025 04:37:58 GMT

hello,

for 1:

SW32K3_S32M27x_RTD_4.4_4.0.0_P20_D2403

Re: S32K3: about AC_load_on_Job_Start

Jojo_Hu — Wed, 02 Jul 2025 11:05:41 GMT

@lukaszadrapa

for question 1,

looking forward for your kind support. Tks.

Re: S32K3: about AC_load_on_Job_Start

lukaszadrapa — Wed, 02 Jul 2025 11:33:26 GMT

I did quick test in this version. If the sector which is supposed to be erased is in the same flash block as Fls code, I can see that the code is copied to RAM as expected and the sector is successfully erased. Not sure what's going on on your side...

Re: S32K3: about AC_load_on_Job_Start

Jojo_Hu — Thu, 03 Jul 2025 10:54:25 GMT

how should I define these variables?

Re: S32K3: about AC_load_on_Job_Start

lukaszadrapa — Tue, 08 Jul 2025 06:22:08 GMT

In my test code, I just initialized these addresses in configurator, so it points to unused RAM:

Re: S32K3: about AC_load_on_Job_Start

Jojo_Hu — Tue, 08 Jul 2025 12:37:18 GMT

Which parts of the code in ROM will be placed at this address in RAM ?

This function ?

Re: S32K3: about AC_load_on_Job_Start

lukaszadrapa — Wed, 09 Jul 2025 05:52:58 GMT

Yes, C40_Ip_AccessCode is copied to RAM.

Re: S32K3: about AC_load_on_Job_Start

Jojo_Hu — Mon, 15 Sep 2025 06:41:18 GMT

hi,

The memory distribution of Application and Bootloader are as follows.

If we want to erase and write Application while running in bootloader, and Ac load at startup has been enabled, do we need to configure the on-core MPU as mentioned in the second picture in PreTaskHook ?