Re: [OpenBIOS] adding eepom node to sparc64

[Mark Cave-Ayland]

On 19/05/12 18:21, Blue Swirl wrote:
> On Sat, May 19, 2012 at 4:38 PM, Artyom Tarasenko  wrote:
> > Both Linux and MilaX complain about the missing eeprom / rtc-m48t59 node.
> > Since QEMU actually has this device I tried to add it, but not sure
> > where is it located.

Oooh this will be interesting as Milax currently fails when it fails to 
detect this device - fixing it should get Solaris to boot further. This 
has also been on my list for a while, but so much to do, not enough time...
> > In sun4u.c it's initialized like this:
> >
> > nvram = m48t59_init_isa(isa_bus, 0x0074, NVRAM_SIZE, 59);
> >
> > Is 0x74 the offset to the ISA bus? Then it's wired not as on Ultra-5:
> >             Node 0xf00662d8
> >                 address:  fffba000
> >                 reg:  00000014.00000000.00002000
> >                 model:  'mk48t59'
> >                 name:  'eeprom'
> >
> > Here it looks like it had to be aligned to a beginning of a page,
> > which makes sense because of the large size...
> > So, where QEMU's 0x74 are coming from?
>
> It's the I/O port used by PPC. Looking at the reg, it should be using
> MMIO at address 0 instead.

FWIW I've just had a discussion on qemu-devel and the outcome was that 
the <device>_init() functions are generally just shortcuts to the most 
common "wiring" of the peripherals into a machine. So I suspect you'll 
need to copy the _init() function as sun4_m48t59_init() and customise as 
required.

HTH,

Mark.

adding eepom node to sparc64

[Blue Swirl]

On Sun, May 20, 2012 at 10:23 PM, Mark Cave-Ayland
 wrote:
> On 19/05/12 18:21, Blue Swirl wrote:
> > On Sat, May 19, 2012 at 4:38 PM, Artyom Tarasenko
> >  wrote:
> > > Both Linux and MilaX complain about the missing eeprom / rtc-m48t59 node.
> > > Since QEMU actually has this device I tried to add it, but not sure
> > > where is it located.
>
> Oooh this will be interesting as Milax currently fails when it fails to
> detect this device - fixing it should get Solaris to boot further. This has
> also been on my list for a while, but so much to do, not enough time...
> > > In sun4u.c it's initialized like this:
> > >
> > > nvram = m48t59_init_isa(isa_bus, 0x0074, NVRAM_SIZE, 59);
> > >
> > > Is 0x74 the offset to the ISA bus? Then it's wired not as on Ultra-5:
> > >
> > > Node 0xf00662d8
> > >                    address:  fffba000
> > >                    reg:  00000014.00000000.00002000
> > >                    model:  'mk48t59'
> > >                    name:  'eeprom'
> > >
> > > Here it looks like it had to be aligned to a beginning of a page,
> > > which makes sense because of the large size...
> > > So, where QEMU's 0x74 are coming from?
> >
> > It's the I/O port used by PPC. Looking at the reg, it should be using
> > MMIO at address 0 instead.
>
> FWIW I've just had a discussion on qemu-devel and the outcome was that the
> <device>_init() functions are generally just shortcuts to the most common
> "wiring" of the peripherals into a machine. So I suspect you'll need to copy
> the _init() function as sun4_m48t59_init() and customise as required.

We're now using m48t59_init_isa(), we could instead use m48t59_init()
with zero ports. But this would create a SysBusDevice behind Ebus
which is behind PCI, so PCI BAR changes would not propagate.
> HTH,
>
> Mark.