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Re: multiple eth devices for RedBoot


>>>>> Gary D Thomas writes:

> On Wed, 2003-03-19 at 13:09, Mark Salter wrote:
>> 
>> Here's a patch I've been playing around with which adds multiple
>> ethernet device support to RedBoot. RedBoot doesn't support all
>> of the devices simultaneouly, but it does allow for boot time
>> selection among available devices. With flash, you can select
>> the preferred net device through fconfig. Without flash, the
>> preferred device is selected with CDL. If the preferred device
>> is not found (or otherwise fails to initialize), the rest of
>> the devices are tried in order until one is successfully
>> initialized. The first one successfully initialized becomes the
>> RedBoot net device.

> I like it.  I hope that it doesn't introduce confusion though.
> What if interface A is on subnet A' and interface B is on subnet
> B' and RedBoot's default IP (assuming not using BOOTP) is on B'?

> Maybe the automatic selection only makes sense if you are using
> BOOTP, because in that mode there should be no subnet problems.

I think BOOTP makes it easier to switch devices, but I don't think
its required. If you are statically configured and change devices,
you should change the static IP, etc at the same time if necessary.
Definitely needs some documentation, though.

>> 
>> What do other folks think about this? I really wish there was a
>> way to eliminate CYGSEM_REDBOOT_NETWORKING_HAS_MULTIPLE_DEVS. I
>> couldn't think of a better build-time way to determine that there
>> are multiple devices configured into the system.

> One way (which would be a little invasive, but might be nice for
> other purposes as well) would be to add a CDL interface which is
> implemented by hardware drivers.  Then your "MULTIPLE_DEVS" is
> just "NUM_DEVS > 1"

Ahh, CYGHWR_NET_DRIVERS looks promising. All eth drivers implement
it. The cdl_interface for it is declared in net/common, so it isn't
visible for RedBoot. Maybe the cdl_interface should be moved to
io/eth instead?

--Mark

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