From: Marek Vasut <marek.vasut@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] non SPL boot on beagleboard-xm
Date: Wed, 25 Jan 2012 18:53:20 +0100 [thread overview]
Message-ID: <201201251853.20895.marek.vasut@gmail.com> (raw)
In-Reply-To: <4F203A6F.40305@ti.com>
> On 01/25/2012 08:43 AM, Peter Meerwald wrote:
> > Hello Tom,
> >
> >>> MLO/SPL + current u-boot breaks the USB ethernet patches (i.e. booting
> >>> via tftp)
> >>
> >> Even with 'dc off' before you start usb?
> >
> > I was not aware of the u-boot command 'dc off' -- yes, it solve my USB
> > ethernet problem
> >
> > here is my story (from bisecting):
> >
> > v2011.06 + Koen et al. patches (git://github.com/koenkooi/u-boot.git)
> > works
> >
> > shortly afterwards, dcache was enabled (commit
> > c2dd0d45540397704de9b13287417d21049d34c6) and USB ethernet fails
> >
> > v2011.09 works if using 'dc off' before 'usb start' (I tried it as a
> > recent non-SPL u-boot version)
> >
> > u-boot current (137703b811502dfea364650fb3e17f20b4c21333) works as well
> > with 'dc off' before 'usb start'
>
> So what's going on is that the dcache has been enabled now, but the USB
> stack is not safe, so we have to issue 'dcache off' (or 'dc off') before
> starting USB (or in other cases, networking).
Why would it not be safe? Because we don't have the unified cache ops in place
yet? :-(
M
prev parent reply other threads:[~2012-01-25 17:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-24 17:02 [U-Boot] non SPL boot on beagleboard-xm Peter Meerwald
2012-01-24 17:46 ` Tom Rini
2012-01-25 10:03 ` Peter Meerwald
2012-01-25 15:20 ` Tom Rini
2012-01-25 15:43 ` Peter Meerwald
2012-01-25 17:22 ` Tom Rini
2012-01-25 17:53 ` Marek Vasut [this message]
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