----- Original Message -----
> From: "Mark Cave-Ayland" <[email protected]>
> To: "Paolo Bonzini" <[email protected]>, "David Gibson"
> <[email protected]>, "edgar iglesias"
> <[email protected]>, [email protected], [email protected],
> [email protected], "cornelia huck"
> <[email protected]>, [email protected], [email protected]
> Cc: [email protected], "peter maydell" <[email protected]>,
> [email protected], [email protected],
> [email protected], [email protected]
> Sent: Thursday, November 10, 2016 4:16:36 PM
> Subject: Re: [Qemu-devel] [PATCHv2 3/3] Split ISA and sysbus versions of
> m48t59 device
>
> On 10/11/16 14:57, Paolo Bonzini wrote:
> >
> >
> > On 09/11/2016 13:22, David Gibson wrote:
> >> The m48t59 device supports both ISA and direct sysbus attached versions of
> >> the device in the one .c file. This can be awkward for some embedded
> >> machine types which need the sysbus M48T59, but don't want to pull in the
> >> ISA bus code and its other dependencies.
> >>
> >> Therefore, this patch splits out the code for the ISA attached M48T59 into
> >> its own C file. It will be built when both CONFIG_M48T59 and
> >> CONFIG_ISA_BUS are enabled.
> >>
> >> Signed-off-by: David Gibson <[email protected]>
> >
> > Who needs the ISA M48T59? Perhaps it should be a separate symbol
> > altogether. Let's document that SPARC will stop providing it in 2.9,
> > for example, if it's only a PReP thing.
> >
> > Paolo
>
> Hi Paolo,
>
> The ISA M48T59 is still actively used by the sun4u machine on
> qemu-system-sparc64. In real terms it's actually connected to the ebus,
> but for all intents and purposes it's the same as an ISA bus connected
> via a PCI bridge.
sun4u is actually using the sysbus M48T59, and mapping it into the ebus
space:
nvram = m48t59_init(NULL, 0, 0, NVRAM_SIZE, 1968, 59);
s = SYS_BUS_DEVICE(nvram);
memory_region_add_subregion(get_system_io(), 0x2000,
sysbus_mmio_get_region(s, 0));
Paolo
