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This is the target for 32-bit Cortex-A bare-metal, when using the FPU. The target is well tested by the Embedded Devices Working Group, and the soft-float target (armv7a-none-eabi) is already Tier 2.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.