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

[Tang Yuantian-B29983]

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.

Regards,
Yuantian

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