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

[divithsid]

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??

[jeremyzhou]

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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[divithsid]

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

[jeremyzhou]

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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[divithsid]

Is it  possible to elaborate answer for 1st question?

[divithsid]

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

[jeremyzhou]

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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[divithsid]

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.. 

[jeremyzhou]

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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[divithsid]

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??  

[jeremyzhou]

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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[divithsid]

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.. 

[jeremyzhou]

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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[divithsid]

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.

[jeremyzhou]

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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