[U-Boot] Micrel Ethernet controller with SPI

[U-Boot] Micrel Ethernet controller with SPI

[Steven Zedeck]

Hi,
I'm not sure whether I'm supposed to ask this question as I am still new to
this list.

I am working on a project using U-boot but the Ethernet controller is the
Micrel KSZ8851.
Does a driver exist that supports this chip? I assume it would be in
drivers/net/

I don't have it in my version which is based on 2008.10

Before I go through the effort to write one, I thought I'd ask whether the
U-boot community has one or perhaps someone is working on one.

Thanks in advance,
Steve
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[U-Boot] Micrel Ethernet controller with SPI

[Ben Warren]

Hi Steven,

Steven Zedeck wrote:
> Hi,
> I'm not sure whether I'm supposed to ask this question as I am still new to
> this list.
>
> I am working on a project using U-boot but the Ethernet controller is the
> Micrel KSZ8851.
> Does a driver exist that supports this chip? I assume it would be in
> drivers/net/
>
> I don't have it in my version which is based on 2008.10
>
> Before I go through the effort to write one, I thought I'd ask whether the
> U-boot community has one or perhaps someone is working on one.
>
> Thanks in advance,
> Steve
>   
I wrote one for the KSZ8841 but it's not in the tree.  It used a memory 
interface, though, not SPI.  Not sure if that would help or not.  If you 
think it's close enough I can dig it up, though it may take some time.

regards,
Ben

[U-Boot] Micrel Ethernet controller with SPI

[Mike Frysinger]

On Friday 20 February 2009 14:17:10 Ben Warren wrote:
> Steven Zedeck wrote:
> > I'm not sure whether I'm supposed to ask this question as I am still new
> > to this list.
> >
> > I am working on a project using U-boot but the Ethernet controller is the
> > Micrel KSZ8851.
> > Does a driver exist that supports this chip? I assume it would be in
> > drivers/net/
> >
> > I don't have it in my version which is based on 2008.10
> >
> > Before I go through the effort to write one, I thought I'd ask whether
> > the U-boot community has one or perhaps someone is working on one.
>
> I wrote one for the KSZ8841 but it's not in the tree.  It used a memory
> interface, though, not SPI.  Not sure if that would help or not.  If you
> think it's close enough I can dig it up, though it may take some time.

the Blackfin BF518F-EZBRD board has the same micrel part.  we hook up to it 
via the on-chip MAC and to control it, we use the SPI bus.  but we dont do 
anything special ... we just turn it on in the board init code.  all the other 
networking stuff is handled via the on-chip MAC driver ...

look at the board_eth_init() function here:
http://git.denx.de/?p=u-boot/u-boot-
blackfin.git;a=commitdiff;h=e24cbd1d2cfddfe0f211eb1a5f2aad23e2a52c22

i dont think u-boot has the framework to hook up MAC switches like the micrel 
part yet ... even the Linux kernel lacks proper support still (although 
patches are floating around).
-mike
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[U-Boot] Micrel Ethernet controller with SPI

[Steven Zedeck]

Mike,
I "think" what I need to do is to create or find a driver that will
ultimately live in drivers/net/ and has functions such as eth_init,
eth_send, eth_tx, etc.

Currently we use a different chip and it is supported by the existing
u-boot. The Ethernet chip is supported by drivers/net/enc28J60.c Many other
chips are supported by files in the same directory.

All I'm really concerned with is u-boot's ability to do a ping test as well
as read/write registers.
Do you have support for eth_send, rx, etc?
Thanks,
Steve


Mike Frysinger wrote:
> 
> On Friday 20 February 2009 14:17:10 Ben Warren wrote:
>> Steven Zedeck wrote:
>> > I'm not sure whether I'm supposed to ask this question as I am still
>> new
>> > to this list.
>> >
>> > I am working on a project using U-boot but the Ethernet controller is
>> the
>> > Micrel KSZ8851.
>> > Does a driver exist that supports this chip? I assume it would be in
>> > drivers/net/
>> >
>> > I don't have it in my version which is based on 2008.10
>> >
>> > Before I go through the effort to write one, I thought I'd ask whether
>> > the U-boot community has one or perhaps someone is working on one.
>>
>> I wrote one for the KSZ8841 but it's not in the tree.  It used a memory
>> interface, though, not SPI.  Not sure if that would help or not.  If you
>> think it's close enough I can dig it up, though it may take some time.
> 
> the Blackfin BF518F-EZBRD board has the same micrel part.  we hook up to
> it 
> via the on-chip MAC and to control it, we use the SPI bus.  but we dont do 
> anything special ... we just turn it on in the board init code.  all the
> other 
> networking stuff is handled via the on-chip MAC driver ...
> 
> look at the board_eth_init() function here:
> http://git.denx.de/?p=u-boot/u-boot-
> blackfin.git;a=commitdiff;h=e24cbd1d2cfddfe0f211eb1a5f2aad23e2a52c22
> 
> i dont think u-boot has the framework to hook up MAC switches like the
> micrel 
> part yet ... even the Linux kernel lacks proper support still (although 
> patches are floating around).
> -mike
> 
>  
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
> 
> 

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[U-Boot] Micrel Ethernet controller with SPI

[Mike Frysinger]

On Friday 20 February 2009 16:36:52 Steven Zedeck wrote:
> I "think" what I need to do is to create or find a driver that will
> ultimately live in drivers/net/ and has functions such as eth_init,
> eth_send, eth_tx, etc.
>
> Currently we use a different chip and it is supported by the existing
> u-boot. The Ethernet chip is supported by drivers/net/enc28J60.c Many other
> chips are supported by files in the same directory.

unfortunately, these mac switches arent quite that simple.  you've got to work 
with the MAC that hooks up to the switch, and you've got to work with the 
arbitrary number of MACs that exist in the switch.

if we look at the Blackfin setup, we have the "bfin_mac" driver and that fully 
controls the MAC that is inside of the Blackfin chip.  but then the MAC switch 
needs setup and programming as well.

we cheat and do bare min stuff:
 - bootstrap some settings according to pins
 - turn on the switch via spi (the code i referred to earlier)
 - let everything else autonegotiate

> All I'm really concerned with is u-boot's ability to do a ping test as well
> as read/write registers.
> Do you have support for eth_send, rx, etc?

yes, because we only worry about the bfin_mac side.  maybe Ben has more 
already.  otherwise i'd watch/review the linux kernel stuff and try and poach 
just :).
-mike
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