[U-Boot] non SPL boot on beagleboard-xm

[Tom Rini]

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).

-- 
Tom