Here is a third beta test for Teensyduino 1.55.

Linux 32 bit:

Linux 64 bit:

Linux ARM:

Linux ARM64:

MacOS 10.10 to 11.x:

MacOS 10.8 to 10.14:


Changes since Teensyduino 1.55-beta2:

SdFat use MAINTAIN_FREE_CLUSTER_COUNT on 32 bit Teensy
Do not build .lst file - very slow for large code
Sketch > Export Compiled Binary now saves .ehex, if possible
Consistent startup sequence on Teensy 3 & 4
Add startup_default_middle_hook()
Fix Serial.begin() delay with serial emulation and Teensy 3
String compatibility with Arduino for C++ iterators
Fix DMAChannel triggerContinuously() on Teensy 4 (Kurt E)
Fix CCM_ANALOG_PLL_ENET define (Shawn Silverman)
Improve arm_dcache_delete() documentation
Rename LittleFS example folders
LittleFS_RAM always starts blank
Update ST7735_t3
Update TeensyThreads
Fix Teensy Loader GUI stalls with locked Teensy 4
Show .ehex filename in status bar when automatically using .ehex
Clearer messages about hex vs ehex in Verbose Info
Only show percentage flash used after connecting to real hardware
Avoid fusewrite fuse memory corruption if different key used
Improve error messages in fusewrite sketch