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Questions about MCUBoot secondary image slot on SDHC card

Glen M

I've been searching threads on this topic on DevZone and I found a couple that concluded that MCUBoot can work with external SPI flashes, but not with an SD card.

Is that still the case?

I can currently fit two images in my processor, but I don't have as much free space for future changes as I'd like (The code compiles to 415788 bytes of flash and the default image size is 499200, which is 83.29% full). So I'd like to make the SD card work, but if it's a huge can of worms maybe we're ok. 

Anyway, if I commit to modifying MCUBoot files, it seems like if I just replace all instances of reading or writing flash with my own SD card read/write functions it shouldn't be terribly complicated, right?

Thanks,

Glen

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  • +1

    Hello,

    I've been searching threads on this topic on DevZone and I found a couple that concluded that MCUBoot can work with external SPI flashes, but not with an SD card.

    MCUboot won't support booting from an SD card, and I think this is because MCUboot expects a firmware image inside the flash memory, or, I would say, MCUboot is not designed to fetch and execute the firmware image from an SD card. See the limitation inside the bootloader section.

    Kind Regards,

    Abhijith

Reply
  • +1

    Hello,

    I've been searching threads on this topic on DevZone and I found a couple that concluded that MCUBoot can work with external SPI flashes, but not with an SD card.

    MCUboot won't support booting from an SD card, and I think this is because MCUboot expects a firmware image inside the flash memory, or, I would say, MCUboot is not designed to fetch and execute the firmware image from an SD card. See the limitation inside the bootloader section.

    Kind Regards,

    Abhijith

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