Expand description

Targets the ARMv4T, with code as a32 code by default.

Primarily of use for the GBA, but usable with other devices too.

Please ping @Lokathor if changes are needed.

Important: This target profile does not specify a linker script. You just get the default link script when you build a binary for this target. The default link script is very likely wrong, so you should use -Clink-arg=-Tmy_script.ld to override that with a correct linker script.

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