Subject: Re: NetBSD/hpcarm snap code
To: Jason R Thorpe <firstname.lastname@example.org>
From: Chris Gilbert <email@example.com>
Date: 02/16/2001 21:29:08
On Friday 16 February 2001 9:10 pm, Jason R Thorpe wrote:
> We support several ARM CPUs and ARM CPU core logic. That stuff should
> go into sys/arch/arm/. Stuff that is CPU model specific should go
> into a subdirectory of that directory. E.g.:
presumably if we ever have sys/cpu/arm we shift the processor goo into there?
> arch/arm/arm <- contains stuff that works on all ARM CPUs
> arch/arm/arm2 <- contains e.g. the ARM2 pmap module
> arch/arm/arm6 <- contains e.g. the ARM6 pmap module,
> cache routines, TLB routines, etc.
> arch/arm/arm7 <- contains all the ARM7-specific goo.
> arch/arm/arm8 <- contains all the ARM8-specific goo.
> arch/arm/sa110 <- contains e.g. the SA110 cache routines,
> TLB routines, etc.
> arch/arm/sa11x0 <- contains all the SA11x0-specific goo,
> including drivers for the on-chip
> arch/arm/ebsa285 <- Support for the '285 core logic, etc.
> Note that "EBSA285" is really just an
> ARM-specific board architecture, but
> doesn't define e.g. firmware.
> arch/arm/ofw <- Support for the ARM bindings for
> OpenFirmware (i.e. the calling
> convention that is defined by the
> IEEE OpenFirmare ARM supplement, etc.).
> arch/acorn26 <- port to the A310/A410/A5000 (did I get
> those right?) Totally different memory
> management architecture than the later
> Acorn machines, tend to have small memory,
> don't want to bog it down with the other
> stuff in a GENERIC that supported the 32-bit
They use ioc and memc (not a unified iomd) so that makes sense.
> arch/acorn32 <- port to the RiscPC and A7000 (looks like
> the RiscPC and A7000 could boot the same
> kernel? Is that true? If so, why are
> there separate kernels for them in the
> current arm32 port?)
Shouldn't this more be the hardware that's based on the arm/iomd/vidc combo,
which future machines will be based on. As for the merge, lack of time I
believe (unless the IOMD and the built-in IOMD on the ARM7500 is in a
different physical address)
> arch/cats <- port to the CATS and any other EBSA285
> that uses the Cyclone firmware.
> arch/dnard <- port to the DNARD platform, including the
> DNARD-specific devices.
> dev/acorn/iomd <- Driver for the IOMD and IOMD attachments of
> other devices.
> dev/acorn/vidc <- Driver for the VIDC and the WSCONS glue for it.
hmm, I'm not sure these are specific to the acorn32's. Certianly I'd expect
/dev/acorn/podulebus as it's common to both the acorn26 and acorn32.
> ....etc. The way we currently treat all these VERY DIFFERENT platforms
> as the same is really wrong-headed.
Yep. Makes sense, especially with new things popping up (didn't know we had
a hpcarm port until this morning! :)