[U-Boot] armv7: fix: Disable D cache for goni target (s5p)

[Lukasz Majewski]

On Thu, 14 Jul 2011 16:00:23 +0200
Albert ARIBAUD <albert.u.boot at aribaud.net> wrote:

> Hi Lukasz,
> 
> Le 11/07/2011 09:41, Lukasz Majewski a écrit :
> > Signed-off-by: Lukasz Majewski<l.majewski at samsung.com>
> > Cc: Minkyu Kang<mk7.kang at samsung.com>
> > Cc: Aneesh V<aneesh at ti.com>
> > ---
> 
> Can you please submit a V2 patch in which the commit message provides
> a rationale for turning the data cache off? People who want to turn
> it on later will benefit from the info.
> 
> Amicalement,

Hi Albert,

Rationale for turning OFF D cache:

1. Before change introduced in commit
SHA1:c2dd0d45540397704de9b13287417d21049d34c6 the D-cache for
GONI/Universal_c210 targets was disabled. This change was supposed to
preserve this state.

2. I've done some investigation about enabling D-cache support. It
turned out, that some drivers (which are already posted or are in the
queue for posting to u-boot list) have had problems with D-cache
coherency. 

This commit shall be treated as a temporal solution. After solving
cache management (and coherency) problems the D-cache would be
definitely enabled.

-- 
Best regards,

Lukasz Majewski

Samsung Poland R&D Center
Platform Group