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Priyank
Senior
Apr 25, 2025 1:37 PM UTC
Solved

reserving a section of internal flash for FatFs

Hi, I wanted to know if it is possible and how to approach reserving/allocating a section of internal flash (The Resource section) for a FatFs file?

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Tesla DeLorean
Tesla DeLoreanBest answer
Guru
May 2, 2025 4:32 PM UTC

TBH it's woefully ill suited to FatFs..

You can hide areas from the LINKER via the LINKER SCRIPT (.ld) or the SCATTER FILE (.sct) depending on your tools. The Linker can only use space you tell it about, so you can shrink sizes and make holes, which it will then NOT USE.

FatFs works a lot better with the QSPI NOR FLASH 4KB sectors (very slow to write), or with eMMC / MicroSD cards

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2 replies

Saket_Om
ST Technical Moderator
May 2, 2025 3:55 PM UTC

Hello @Priyank 

Did you try to check the example provided in the X-CUBE-EEPROM package.

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Saket_Om
Tesla DeLorean
Tesla DeLoreanBest answer
Guru
May 2, 2025 4:32 PM UTC

TBH it's woefully ill suited to FatFs..

You can hide areas from the LINKER via the LINKER SCRIPT (.ld) or the SCATTER FILE (.sct) depending on your tools. The Linker can only use space you tell it about, so you can shrink sizes and make holes, which it will then NOT USE.

FatFs works a lot better with the QSPI NOR FLASH 4KB sectors (very slow to write), or with eMMC / MicroSD cards

Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
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