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