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Date: Thu, 31 May 2012 19:06:31 +0200
From: Sascha Hauer <s.hauer@pengutronix.de>
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Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org
Subject: Re: Booting mx25 based device from SD and NOR
To: Roberto Nibali <rnibali@gmail.com>
Cc: barebox@lists.infradead.org

On Thu, May 31, 2012 at 03:12:08PM +0200, Roberto Nibali wrote:
> Hi
> 
> 
> 
> > > +# or set your networking parameters here
> > > +#eth0.ipaddr=192.168.1.80
> > > +#eth0.netmask=255.255.255.0
> > > +#eth0.gateway=a.b.c.d
> > > +eth0.serverip=192.168.1.23
> > > +eth0.ethaddr=00:50:c2:8c:e6:0e
> >
> > *never* *ever* add MAC addresses to the default environment.
> 
> 
>  Ok. In my case, the MAC address is actually stored inside a secured at24
> EEPROM buffer. Unfortunately, at24 via I2C does not seem to be available in
> barebox. I reckon I have to port it from the kernel or uboot :).

Or just leave the field blank. In this case a random (local-) MAC
address is generated.

> 
> I have included some more debugging and also workarounds for the mx25. This
> is the current debug output, where it clearly indicates that for some
> reason the mx25 esdhc related registers never show a transfer complete for
> a multiblock write:

The kernel has this:

 if (is_imx25_esdhc(imx_data) || is_imx35_esdhc(imx_data))
                /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
                host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
                        | SDHCI_QUIRK_BROKEN_ADMA;

Which means that the kernel won't do multiblock on i.MX25 and i.MX35.

Sascha

-- 
Pengutronix e.K.                           |                             |
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