Initial MIPS CPUs support

[FlyGoat]

Hi,

This PR implemented initial support for MIPS based CPUs, it implemented bios_map hook for CPU to deal with problem mentioned in #1903, fixed AHB bus handling then added two CPUs as examples.

Please review.

Thanks

[FlyGoat]

For Python CI test I'm not sure what's the best way to provide source to CI action, probably create pythondata package for both?

[cyyself]

Thanks for adding this!

[FlyGoat]

@enjoy-digital Any comments?

[enjoy-digital]

@FlyGoat: Sorry, I've been very busy recently. I'll have a closer look in late August/early September.

[Ruinland]

Hi @FlyGoat ,

Sorry for running into your issue thread all of a sudden. I just happen to see the Linux defconfig being merged in the upstream and thus follow the bread crumbs leading me here.

I am wondering if the CDIM (and other MIPS CPUS lised here) are landing to LiteX-hubs ? (In the form of pythondata-cpu-* )

If not, would you be so kind to provide some info so bystanders folks like me could lay hands on them ?

Cordially yours, Ruinland

[FlyGoat]

Hi @Ruinland,

I think it's pending on this PR? Most CPU listed here do have a permissive license, so there is no problem to redistribute in litex-hub.

Thanks!

[FlyGoat]

Hi @enjoy-digital apologies for chasing on this, another gentle ping :-)

[rickliu2000]

Sorry, but any updates on this pr? @enjoy-digital