genkey for DSA with 2048 bit

[Harakiri]

Hello,

the old DSA standard only supported 1024 bit, however the newer with SHA256 support 2048 and more.

I tried it with the --genkey command, i tried

Key-Type: DSA2
Key-Type: DSA-2
Key-Type: DSASHA256

no dice, how can you generate these kind of keys?

And, do old gpg versions verify such signatures correctly?

Thanks