[U-Boot] [U-Boot, 2/3] mpc85xx: Add deep sleep framework support

[Scott Wood]

On Mon, 2014-02-24 at 14:44 +0800, Tang Yuantian-B29983 wrote:
> On 2014/2/18 星期二 3:18, Scott Wood wrote:
> > On Sun, 2014-02-16 at 21:35 -0600, Tang Yuantian-B29983 wrote:
> >>> -----Original Message-----
> >>> From: Wood Scott-B07421
> >>> To: Tang Yuantian-B29983
> >>> Cc: Sun York-R58495; Li Yang-Leo-R58472; u-boot at lists.denx.de; Kushwaha
> >>> Prabhakar-B32579; Jin Zhengxiong-R64188
> >>> Subject: Re: [U-Boot,2/3] mpc85xx: Add deep sleep framework support
> >>>
> >>> On Thu, 2014-02-13 at 02:12 -0600, Tang Yuantian-B29983 wrote:
> >>>>> Use an I/O accessor.
> >>>> In_be64?? No such function.
> >>> Why do you need in_be64() rather than two in_be32()s?
> >>>
> >> Avoid ECC error. Although, according to my test, in_be32() works too.
> > Why would you get an ECC error?
> >
> > -Scott
> DDR operation is always in 64bits. if writing a 32bits to memory, you 
> need to
> read a 32bits first, and combine it to form a 64bits. when the new 
> 64bits is written
> to memory, ECC occurs.
> I was required to do so by hardware team.

U-Boot on PPC is a 32-bit binary (even on 64-bit hardware), so the
compiler is already turning that into two 32-bit writes.

-Scott