topic Re: I need to know how these ROM API in imxrt106x process the data to store in Flash in i.MX RT Crossover MCUs

I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Mon, 25 Jul 2022 10:40:49 GMT

I'm using ROM API's to store the sensitive data into NVM(Flash) as we don't have EEPROM.

1. I just need to check that, the data which is present in RAM will store into Flash?

2. Will these API's affect XIP mode??

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Tue, 26 Jul 2022 03:18:05 GMT

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1. I just need to check that, the data which is present in RAM will store into Flash?
-- Yes.
2. Will these API's affect XIP mode??
-- No.
Have a great day,
TIC

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Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Tue, 26 Jul 2022 14:03:37 GMT

Is it possible to elaborate answer for 1st question?

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Thu, 28 Jul 2022 04:34:47 GMT

1. Will these API are available in RAM after application boot up?

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Thu, 28 Jul 2022 06:04:58 GMT

Hi,
Thanks for your reply.
1) Will these API are available in RAM after application boot up?
--- Actually, I'm not very clear with this question, whether you can clarify it again.
Have a great day,
TIC

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Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Mon, 01 Aug 2022 05:32:07 GMT

Do I need to disable interrupts when using the ROM API to operate external Flash? Or are interrupts disabled in the ROM API? The actual operation does not seem to be necessary

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Mon, 01 Aug 2022 09:05:08 GMT

Hi，
Thanks for your reply.
1) Do I need to disable interrupts when using the ROM API to operate external Flash? Or are interrupts disabled in the ROM API? The actual operation does not seem to be necessary
-- In my opinion, you'd better implement some critical section protection measures, such as disabling interrupt prior to calling the FlexSPI ROM API
Have a great day,
TIC

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Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Mon, 01 Aug 2022 09:09:20 GMT

Does you have any particular document which holds your statement.. Coz I have critical data to monitor if I suspend the tasks or disable IRQ then I may miss the information when these API triggered..

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Tue, 02 Aug 2022 03:23:50 GMT

Hi,
1) Does you have any particular document which holds your statement.. Coz I have critical data to monitor if I suspend the tasks or disable IRQ then I may miss the information when these API triggered.
-- No, I get the conclusion base on my experience, that it's hard to tradeoff handling flash safety and receiving some information in time, in this case, you need to make choice.
Have a great day,
TIC

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Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Wed, 10 Aug 2022 16:26:22 GMT

I'm facing some few issues,

1. What is the minimum erase size, maximum write and read size.

2. I have situation where need to take 4kb data as backup coz min erase size is 1 sector(4kb). is there any way to write/read 4kb in 1 stretch or can we reduce erase size to 256 bytes??

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Thu, 11 Aug 2022 02:25:59 GMT

Hi @divithsid ,
Thanks for your reply.
1. What is the minimum erase size, maximum write and read size.
-- It's determined by the external flash, the minimum erase unit usually is one sector, for the read or write operation, it should be one page.
2. I have situation where need to take 4kb data as backup coz min erase size is 1 sector(4kb). is there any way to write/read 4kb in 1 stretch or can we reduce erase size to 256 bytes??
-- It's able to read or write a sector which consist fo several pages, however, it's impossible to reduce the erase size.
Have a great day,
TIC

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Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Tue, 16 Aug 2022 05:26:46 GMT

Do you have any schema to read 4kb, erase 4kb, and writing 4kb in a stretch?

if you have any suggestion on how to handle above scenario, do let me know..

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Wed, 17 Aug 2022 06:10:57 GMT

Hi,
Thanks for your reply.
1) Do you have any schema to read 4kb, erase 4kb, and writing 4kb in a stretch?
- As I mentioned before, the flash operations depend on the external flash, so I'd like to suggest you refer to its datasheet.
Have a great day,
TIC

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Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

divithsid — Wed, 17 Aug 2022 13:24:24 GMT

Hi,

I tried reading 1kb works fine but if I increase to 2kb the system will restart. As data sheet of flash memory states that, we can read the entire 16Mb in one single instruction.

Re: I need to know how these ROM API in imxrt106x process the data to store in Flash

jeremyzhou — Thu, 18 Aug 2022 01:44:31 GMT

Hi @divithsid ,
Thanks for your reply.
I'd like to suggest you'd better create a new case for this question.
Have a great day,
TIC

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