Add disk storage support (SD cards) #2584
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Controlled using `ENABLE_STORAGE_SIZE64` and `ENABLE_FILE_SIZE64` build variables
`gcc` library required
Implement `sync()`, allow `format` to be called without first mounting volume.
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This PR extends the Storage system to support block-based devices such as SD cards.
Storage sizes have been changed from
uint32_ttostorage_size_t. Default operation is unchanged, but this allows 64-bit offsets to be used to support devices greater than about 4GB.The existing
SDCardlibrary has been taken and reworked extensively with added GNU/Linux source code to handle MBR/GPT partitioning. The result is theDiskStoragebase library, which is then used by theSdStoragelibrary to provide specific SD card support, currently using SPI.Optional buffering for block devices is included to support other filing systems. LittleFS appears to work but Spiffs doesn't - it requires erased sectors to be 0xFF which is fundamentally incompatible.
Finally, the
FatIFSlibrary has been added, using the current version of Chan's fatfs library. There are some minor modifications in the code to fix time handling and simplify use.Testing for these libraries has been implemented by verifying generated filesystem images using standard GNU/Linux tools.