AVR64EA32 on PlatformIO

[Taragorm]

Context: I'm trying to move to PlatformIO as a build environment from VisualMicro.

I have a new board build round the AVR64EA32 (I needed those timers!).

[env]
platform = atmelmegaavr
framework = arduino

; Chip in use
board = AVR64EA32

Which results in:

Resolving Upload_UPDI dependencies...
UnknownBoard: Unknown board ID 'AVR64EA32'

If I alter the board to AVR64DB32, it works, and we get:

HARDWARE: AVR64DB32 24MHz, 8KB RAM, 64KB Flash
PACKAGES:
 - framework-arduino-megaavr-dxcore @ 1.5.6
 - toolchain-atmelavr @ 3.70300.220127 (7.3.0)

Now, the DX core version there looks old (1.5.6), so I guess the EA isn't supported by it.

The Arduino boards manager shows 1.5.10 available, so I could fall back to using VisualMicro/old school, but I'd rather not.

So, what incantation do I need to get PlatformIO to fetch the latest DXcore, since it looks like whatever feed it's using is stale?

[Taragorm]

For now, I'm reverting to something a bit more old skool, as I get the feeling EA core support isn't quite baked yet, so it would be best to use a better supported tool chain.