topic Re: ROM api nor flash in i.MX RT Crossover MCUs

ROM api nor flash

sandeepc — Tue, 30 Apr 2024 07:29:49 GMT

Winbond flash:W25Q64JVSSIQ

SDK version: 2.14.0

Controller: MImxrt1170

IDE version:

MCUXpresso IDE v11.8.0 [Build 1165] [2023-07-26]

We are developing custom boot loader for one of our application.

i tried with importing nor flash example it works only when i link complete application to RAM.

without linking if i call getting below error

static serial_nor_config_option_t option = {

.option0.U = 0xc0000007U,

.option1.U = 0U,

};

status = ROM_FLEXSPI_NorFlash_GetConfig(FlexSpiInstance, &norConfig, &option);

We are trying to call ROM APIs to erase/write to same flash memory from which code is executing.
In this scenario, are we supposed to call ROM APIs only from RAM, or can it be called from main application running from flash (QSPI)?
If ROM APIs can be called from flash, can you please provide a example?

@kerryzhou

@diego_charles

Re: ROM api nor flash

Littell — Mon, 09 Sep 2024 16:28:43 GMT

Any answer for this? Can the ROM API's actually be used with XIP SPI NOR Flash? If so, how?

Re: ROM api nor flash

diego_charles — Tue, 10 Sep 2024 20:11:29 GMT

Hi @Littell

I think the follow up for @sandeepc where made somewhere else, @sandeepc if you are still getting issues feel free to let us now .

With regards to your questions, yes , ROM APIS can be used with with XIP SPI NOR Flash.

Let me detail some issues we had and worked with the romapi demo:

With SDK 2.15 the ROM API did not work as expected, so a change must be done, refer to this thread and more specifically to this comment.

With SDK 2.16 we where able to solve the problem, and no modifications where required. In case of still getting issues, please make a mass erase, as we found out in this thread evkbrt1170 romapi

All of this where tested on the RT1170 EVK from our side. If you are still getting issues, feel free to let us know.

Diego

Re: ROM api nor flash

Littell — Tue, 10 Sep 2024 21:43:35 GMT

But on the RT1170 EVKB the Winbond Flash runs at 133 MHz, right? The Winbond Data Sheet (W25Q512 Section 8.2.23) specifies that 8 dummy clocks should be used at that clock rate. So why and how could changing to 6 have fixed anything?

Re: ROM api nor flash

Littell — Thu, 12 Sep 2024 02:43:54 GMT

Waiting for clarification on this.

Re: ROM api nor flash

Littell — Fri, 13 Sep 2024 15:08:16 GMT

Still waiting for clarification - it makes no sense to me how that change could actually fix anything related to the OP's problem.

Re: ROM api nor flash

Littell — Fri, 20 Sep 2024 15:12:50 GMT

OK, I'll give up on an actual explanation. What, then, were the changes in 2.16 that allowed things to work?