FatFs does not work on encrypted partition

[BennoTr]

Hi all.

I took the wear_levelling example and set the encrypted flag on the storage partition:

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# Name,   Type, SubType, Offset,  Size, Flags
# Note: if you change the phy_init or app partition offset, make sure to change the offset in Kconfig.projbuild
nvs,      data, nvs,     0x9000,  0x6000,
phy_init, data, phy,     0xf000,  0x1000,
factory,  app,  factory, 0x10000, 1M,
storage,  data, fat,     ,        1M, encrypted

Now the FW displays the following errors during mounting of the filesystem:

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I (108) example: Mounting FAT filesystem
E (203) wl_flash: initSections(269): result = 0x00000104
E (203) wl_flash: init(161): result = 0x00000104
E (203) wl_ext_safe: init(73): result = 0x00000104
E (208) wear_levelling: wl_mount: init instance=0x00000000, result=0x104
E (213) vfs_fat_spiflash: failed to mount wear levelling layer. result = 260
E (223) example: Failed to mount FATFS (0x104)

According to this forum thread viewtopic.php?t=3305 it shold be possible to use FatFs with wear leveling on an encrypted partition.

So what goes wrong?


Regards,
Benno

[ESP_igrr]

Do you have flash encryption enabled in bootloader settings, or have you only changed the flag in the partition table? (Don't enable flash encryption yet if you have not done it, just a question...)

[BennoTr]

@ESP_igrr

I only set the encryped flag in the partition table. But I do not think that enabling encryption via the bootloader would make it work, because the error

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E (203) wl_flash: initSections(269): result = 0x00000104

points to the code at WL_Flash.cpp line 298/269

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    result = this->flash_drv->write(this->addr_cfg, &this->cfg, sizeof(wl_config_t));
    WL_RESULT_CHECK(result);

and here it tries to write the configuration with size sizeof(wl_config_t). This wl_config_t has a size of 9*4=36 bytes. But spi_flash_write_encrypted does reject every write with a size not a muptile of 16 with ESP_ERR_INVALID_SIZE.

Regards,
Benno

[ESP_igrr]

You're right, it looks like wl_config_t has grown by 4 bytes somewhere... We will check this.

[ESP_Angus]

Hi Benno,

Sorry for the slow reply. This bug has been fixed in the IDF master branch, and will be in the V3.1 release:
https://github.com/espressif/esp-idf/co ... 75d67d9ece


Angus

[BennoTr]

Hi Angus.

I tried your patch with the wear_levelling example and the encrypted flag set on the storage partition. Now the low level errors have disapeared, but now I get the high level error when opening a file for writing:

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I (244) example: Mounting FAT filesystem
W (404) vfs_fat_spiflash: f_mount failed (13)
I (404) vfs_fat_spiflash: Formatting FATFS partition
I (814) vfs_fat_spiflash: Mounting again
I (814) example: Opening file
E (824) example: Failed to open file for writing

According to the log messages formating the partition has worked. But when I restart the exact same log messages apear. So on re-start the device detected the partition as not formated.

Please test the wear_levelling example with encrypted flag set for yourself.

Regards,
Benno

[ESP_Angus]

Hi Benno,

Thanks for your patience while we looked into this. We've identified the bug running wear levelling on encrypted partitions and a fix is being developed.

Angus

[mitipi]

Hi @ESP_Angus,

Is the fix now deployed, I saw a read-only fatfs encryption commit without using wear-leveling recently. Can you provide some details?

Best regards,
Mitipi

[Mikhail Khalizev]

Hi.

Any news about it?
How I see, fat still is not working on encrypted partition.

[ESP_Angus]

Hi Mikhail,

How I see, fat still is not working on encrypted partition.

This should work now. If it's not working, can you please give some more details (ESP-IDF version, exact configuration & setup, behaviour you're seeing when trying to use the FAT partition.)