Add docs for flashing firmware and bootloader

bigtreetech / BIGTREETECH-SKR-V1.3

32bit board with LPC1768, support marlin2.0 and smoothieware, support lcd2004/12864, On-board TMC2130 SPI interface and TMC2208 UART interface no additional wiring is required

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Add docs for flashing firmware and bootloader #491

Open KoviRobi opened 3 years ago

KoviRobi commented 3 years ago

My SD card slot wasn't working so I had to find out how to flash via USB. In the process I found out how to flash the bootloader, because I thought you were using the vanilla Smoothieware bootloader which uses pin 2.12 to flash (so I loaded a modified version onto it). I think this is useful information for others, though feel free to suggest a better place than the top level README (while the pinouts might be 1.4 specific, the method should work for both boards).

alexmaloteaux commented 3 years ago

This is extremely helpful , thanks a lot for this doc