STM32G491 Flash memory organization

Doublesets · ‎2024-07-12

Hello

For my project I use a stm32g491rct6 with 256k flash. RM0440 Reference manual table 2 say that the flash of this Micro is 256KB in single bank, at this point what is the page size and flash mapping? In stm32g4xx_hal_flash.h FLASH_PAGE_SIZE is 0x800U /* 2 KB */ and bit22 in User option bytes is SET .
The project created with cubeide 1.15.1 map all flash in contiguous mode from 800000 to 803ffff.
If I use more than 128KB seems to write the flash in contiguous mode, if I open the same project in STMCubeIDE 1.16.0 when I flash the firmware the operation fail, the only way to solve the proble is to split the code in 2 zones, one fro 0x800000 to 801ffff and one to 8040000 to 805ffff.
Cubeprogrammer 2.16.0 show the block contiguos 0-255 from 8000000 to 807ffff while Cubeprogrammer 2.17.0 show blocks 0-63 from 8000000 to 801ffff and 65280-65343 from 8040000 to 805ffff.
Whats wrong?
Thanks

TDK · ‎2024-07-15

I've requested someone take a look at this. Please be patient.

Clearly it's a bug of some sort as far as I can see.

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KDJEM.1 · ‎2024-07-16

Hello @Doublesets and @TDK ,

Thank you for bringing this bug to our attention.

The STM32G491 belongs to category 4.

So, the size is 2 Kbyte as mentioned in RM0440 table 18

Also, I advise you to refer to STM32 MCU reference manuals: Expected preliminary ... - STMicroelectronics Community for some FLASH typos in RM0440

I confirm the issue and I reported internally.

Internal ticket number: 186668(This is an internal tracking number and is not accessible or usable by customers).

Thank you for your contribution in STCommunity.

Kaouthar

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