!!WORK IN PROGRESS!! Marlin-bugfix-2.0.x for Bigtreetech / BIQU SKR v1.1

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This is a working sample configuration and binary for my BIQU SKR printer, compiled from the Marlin main branch, including a custom-built display with an SD-card slot and TMC2130 drivers in SPI mode. Use this as a reference or test - but keep in mind that your specific printer will be unique! => http://marlinfw.org/docs/configuration/configuration.html To get started, modify all three headers: Configuration.h, Configuration_adv.h & pins_BIQU_SKR_V1.1.h! Progress on the project will be documented on my blog (https://burningbecks.wordpress.com/) once it's no longer changing weekly. The Trinamic driver is wired according to "myseg": https://github.com/MarlinFirmware/Marlin/issues/12632#issuecomment-454149317 and https://github.com/myseg/MarlinFW_SKR1.1_SD_LCD Yes, CS and EN on the same pin seems strange - but that's exactly how it is! => https://github.com/MarlinFirmware/Marlin/issues/12632#issuecomment-453758717 Also be aware of these issues: https://github.com/MarlinFirmware/Marlin/pull/8122 (Garbaged display on shared SPI) and https://github.com/MarlinFirmware/Marlin/issues/11024 (No linear advance with TMC2130 in SpreadCycle mode) If your board doesn't connect via USB after the update, try hitting "reset" again! And if you're still waiting for a new board, consider holding off - according to the BIGTREETECH Public Group on Facebook, the v1.2 is already in development.