Teensy: 4.0 support

[wdevore]

Hi, is there any effort in progress or planned for supporting the Teensy 4.0 board?
It uses the ARM Cortex-M7.

Thanks.

[aykevl]

Hi @wdevore, there is no support right now but multiple people have requested it.
Step one is this PR: cmsis-svd/cmsis-svd#82

[deadprogram]

That PR was merged into the cmsis-svd repo, so now it can be brought into TinyGo to generate the device wrapper.

[firelizzard18]

In #863, I tweaked the generator, so src/device/nxp/mimxrt1062.go is now generated, but there's a lot of work to do, most of which I am unfamiliar with. Once TinyGo can target one teensy, targeting the others should be much less work.

[jbpratt]

I think this can be closed, there is now a teensy40 target!

[deadprogram]

Indeed! Now closing.