Question about SCC Ethernet driver

Question about SCC Ethernet driver

[David Tao]

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Hello there,
   
  Present MPC8260 SCC Ethernet driver supports one 10M Ethernet port for SCC1 or SCC2. And there is a patch on the net said to support one Ethernet port on any of SCC1 - SCC4. As we hope to use all the SCCs for 10M Ethernet ports, we need to change the driver. Questions:
   
  1. Is it possible to implement 7 Ethernet ports (3 FCCs and 4 SCCs) on a MPC8270? I didn't see any hardware restriction on this. Performance may be an issue? 
  2. Is there a driver which supports multiple SCC Ethernet ports simultanously?
   
  Thanks for any help or information.
   
  Regards,
  David
   

			
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Re: Question about SCC Ethernet driver

[Dan Malek]

On Jan 17, 2006, at 8:28 PM, David Tao wrote:

> Present MPC8260 SCC Ethernet driver supports=A0one 10M Ethernet port =
for=20
> SCC1 or SCC2.

Not any more.  Take a look at drivers/net/fs_enet in the 2.6 kernels.
I'm sure Pantelis will have more information when he reads this.

> 1. Is it possible to=A0implement 7 Ethernet ports (3 FCCs and 4 SCCs) =
on=20
> a MPC8270? I didn't see any hardware restriction on this. Performance=20=

> may be an issue?=A0

Depends what you want to do with the data in the CPU core and the
clock speeds you have chosen.  The CPM can handle the data traffic on
the wires if you run it over 133 MHz.

Thanks.

	-- Dan

Re: Question about SCC Ethernet driver

[Pantelis Antoniou]

On Wednesday 18 January 2006 04:04, Dan Malek wrote:
>=20
> On Jan 17, 2006, at 8:28 PM, David Tao wrote:
>=20
> > Present MPC8260 SCC Ethernet driver supports=A0one 10M Ethernet port fo=
r=20
> > SCC1 or SCC2.
>=20
> Not any more.  Take a look at drivers/net/fs_enet in the 2.6 kernels.
> I'm sure Pantelis will have more information when he reads this.
>=20

The current driver (fs_enet) can handle enets on every SCC. Nobody has
tested this configuration yet however.

> > 1. Is it possible to=A0implement 7 Ethernet ports (3 FCCs and 4 SCCs) o=
n=20
> > a MPC8270? I didn't see any hardware restriction on this. Performance=20
> > may be an issue?=A0
>=20
> Depends what you want to do with the data in the CPU core and the
> clock speeds you have chosen.  The CPM can handle the data traffic on
> the wires if you run it over 133 MHz.
>

Your main problem will be dual port RAM conflicts with other peripheral.
In theory CPM can handle it.

> Thanks.
>=20
> 	-- Dan
>=20

Regards

Pantelis