MMC cards support

[Warner Losh]

From: Gary Jennejohn <gary.jennejohn at freenet.de>
Subject: Re: MMC cards support
Date: Fri, 14 Dec 2007 11:52:26 +0100

> On Fri, 14 Dec 2007 10:01:28 +0100
> Bernd Walter <ticso at cicely12.cicely.de> wrote:
> 
> > On Fri, Dec 14, 2007 at 01:26:54AM +0300, Stanislav Sedov wrote:
> > > Probably. It seems that FreeBSD is trying to read MAC address from the chip's
> > > registers, and I though that if the ethernet works in u-boot then this registers
> > > have been set. I'll investigate this further.
> > 
> > Sounds logical, but I don't know u-boot and FreeBSD won't complain
> > without a reason.
> > At least there is no standard place to get the system MAC beside the
> > ate registers.
> > Of course you can hack the ate driver and hardcode a MAC into the kernel.
> > Or you can switch to FreeBSDs own bootcode.
> > 
> 
> u-boot passes this information to Linux in the board info (bd_t)
> structure at boot time.  A lot of Linux ethernet drivers read the MAC
> out of this structure and then set it in the hardware/software.
> 
> Very few u-boot ethernet drivers set the MAC in the hardware themselves.
> 
> With FreeBSD this mechanism is missing.

I did it this way because the Linux driver for the Atmel driver did it
this way.  I thought it was the de-facto way things work.  Patches to
implement this would be welcome.

Warner