Rp2040 performance & bootloader #60
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Loading code from external flash increases latency by small amounts. In practice the effect is quite minimal due to RP2040 integrated cache, but there is enough RAM to do this optimization.
The calculation of parity bits takes about 50% of CPU time for 10 MB/s synchronous transfer.
When the image file is detected to be contiguous, it gets automatically converted to a raw mapping. This avoids SdFat internal overhead.
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Improved RP2040 SCSI performance.
Added SD card bootloader and watchdog timer.