Add spi flash download sub cmd - #411
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Add a new library files for the SPI download function. SPI download combines the spi read/write/verify functions into a single function, providing the raw firmware image the function will handle the chunking of the data for the user. The switchtec_spi_flash_download function is split into 3 phases: Erase - Erases the sectors defined by user starting at the offset. This is optional if the user has already erased the sector it can skipped. Write - Will write starting at the offset, chunking the file at the 1012 byte max per MRPC call. Verify - If the uses wishes to they can also verify the download by reading the spi flash back and byte comparing it to the file provided.
Adds the SPI download subcommand to the SPI CLI command group User provides a file path, offset in the SPI to download to, and whether or not to erase the SPI first, and whether to verify the file is downloaded into the SPI flash by reading back and comparing. Uses progress bar and yes/no prompt similar to the other firmware download functions.
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