[U-Boot-Users] loading MAC address into hardware

[U-Boot-Users] loading MAC address into hardware

[David Peters]

I am trying to boot Linux from flash, but the problem is that the MAC
address never gets initialized before starting Linux.  Is there a way to
instruct u-boot to load the MAC address into the hardware before starting
Linux?

[U-Boot-Users] loading MAC address into hardware

[Jerry Van Baren]

David Peters wrote:
> I am trying to boot Linux from flash, but the problem is that the MAC
> address never gets initialized before starting Linux.  Is there a way to
> instruct u-boot to load the MAC address into the hardware before starting
> Linux?

Yes.

http://www.denx.de/twiki/bin/view/DULG/UBootCmdGroupEnvironment

http://www.denx.de/twiki/bin/view/DULG/UBootEnvVariables

     *  ethaddr: Ethernet MAC address for first/only ethernet interface 
(= eth0 in Linux).
       This variable can be set only once (usually during manufacturing 
of the board). U-Boot refuses to delete or overwrite this variable once 
it has been set.

     * eth1addr: Ethernet MAC address for second ethernet interface (= 
eth1 in Linux).

     * eth2addr: Ethernet MAC address for third ethernet interface (= 
eth2 in Linux).

Some assembly may be required: we don't know _your_ board, _you_ may 
have to implement the routine that actually stores the MAC in your hardware.

gvb

[U-Boot-Users] loading MAC address into hardware

[David Peters]

I understand how to set the ethaddr.  I need the ethaddr loaded into the
emac on the cpu.  I'm using an at91rm9200 if that helps at all.

-----Original Message-----
From: u-boot-users-admin@lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf Of Jerry Van
Baren
Sent: Friday, March 04, 2005 11:38 AM
To: Linux U-Boot Users List
Subject: Re: [U-Boot-Users] loading MAC address into hardware

David Peters wrote:
> I am trying to boot Linux from flash, but the problem is that the MAC
> address never gets initialized before starting Linux.  Is there a way to
> instruct u-boot to load the MAC address into the hardware before starting
> Linux?

Yes.

http://www.denx.de/twiki/bin/view/DULG/UBootCmdGroupEnvironment

http://www.denx.de/twiki/bin/view/DULG/UBootEnvVariables

     *  ethaddr: Ethernet MAC address for first/only ethernet interface 
(= eth0 in Linux).
       This variable can be set only once (usually during manufacturing 
of the board). U-Boot refuses to delete or overwrite this variable once 
it has been set.

     * eth1addr: Ethernet MAC address for second ethernet interface (= 
eth1 in Linux).

     * eth2addr: Ethernet MAC address for third ethernet interface (= 
eth2 in Linux).

Some assembly may be required: we don't know _your_ board, _you_ may 
have to implement the routine that actually stores the MAC in your hardware.

gvb


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[U-Boot-Users] loading MAC address into hardware

[Wolfgang Denk]

In message <3rr5v6$5tg7h8@mxip23a.cluster1.charter.net> you wrote:
> I understand how to set the ethaddr.  I need the ethaddr loaded into the
> emac on the cpu.  I'm using an at91rm9200 if that helps at all.

You may want to read the other FAQ's, too. Like this one:
http://www.denx.de/twiki/bin/view/DULG/EthernetDoesNotWorkInLinux

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Nothing is easier than to denounce  the  evildoer;  nothing  is  more
difficult than to understand him.                 - Fyodor Dostoevski

[U-Boot-Users] Re: loading MAC address into hardware

[Sergei Sharonov]

Wolfgang Denk <wd <at> denx.de> writes:

> 
> In message <3rr5v6$5tg7h8 <at> mxip23a.cluster1.charter.net> you wrote:
> > I understand how to set the ethaddr.  I need the ethaddr loaded into the
> > emac on the cpu.  I'm using an at91rm9200 if that helps at all.
> 
> You may want to read the other FAQ's, too. Like this one:
> http://www.denx.de/twiki/bin/view/DULG/EthernetDoesNotWorkInLinux

Wolfgang,

I think we all understand that the bootloader does not set mac address if no
network operations have been requested, e.g. if we boot from a local flash and 
not from a network. Now, what the question probably was:
"I stored my mac address in u-boot environmental variable. Now I need somehow 
set it in hardware. Is there a way to force u-boot to do it for me even though 
it does not use network for its own needs? If that is not possible then what 
is the best way to pass mac address to linux. I suppose then I can use ifconfig 
to set it" 

I am in the same boat.. Any suggestions?

Thanks,

Sergei Sharonov

[U-Boot-Users] Re: loading MAC address into hardware

[Wolfgang Denk]

In message <loom.20050319T030128-356@post.gmane.org> you wrote:
> 
> I think we all understand that the bootloader does not set mac address if no
> network operations have been requested, e.g. if we boot from a local flash and 
> not from a network. Now, what the question probably was:
> "I stored my mac address in u-boot environmental variable. Now I need somehow 
> set it in hardware. Is there a way to force u-boot to do it for me even though 
> it does not use network for its own needs? If that is not possible then what 

Technically it's trivial to do this. But it would be wrong to  do  it
from  the  design,  as  there  is no need for it (the Linux driver is
responsible    itself    for    sufficiently    complete     hardware
initialization).

> is the best way to pass mac address to linux. I suppose then I can use ifconfig 
> to set it" 

Yes, you can use ifconfig to set the MAC address, or you can fix your
ethernet driver in Linux to initialize the hardware as needed.

There are many ways to pass  the  MAC  address:  on  current  PowerPC
systems  it's  part  of the bd_infor structure; or you can pass it as
part of the boot arguments like  some  MIPS  board  do,  or  you  can
implement bi-recs and use a bi_record for the MAC address, or ...

Or you can use the existing tools to read the environment under Linux
or ...

TIMTOWTDI.


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"If you can, help others. If you can't, at least don't hurt  others."
- the Dalai Lama