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* Resolve HWDT Reset with core_esp8266_vm With the newer GCC compiler (after tag 3.0.2), example virtualmem was crashing with a HWDT reset. Reordered some SPI register set lines in spi_init(). New ordering was based on ::begin in SPI.cpp This change may resolve issues describe in https://github.com/esp8266/Arduino/discussions/9010 * Added memory barrier to changes spi_ctrl appears to need setting before other SPI registers