[U-Boot] RAM Probing for ads5121rev4

[Michele De Candia (VT)]

Wolfgang Denk wrote:
> Dear Emanuele Placidi,
>
> In message <7c4b93310902180021o56da8320w2084e6a8c09c9509 at mail.gmail.com> you wrote:
>   
>>    In your opinion it is possible to probe the ram before initialize it?
>> Unfortunately there are some rev4 which are equipped with different ram
>> model.
>> Examples are welcomed.
>>     
>
> It is a standard feature in U-Boot (and has always  been  right  from
> the start with PPCBoot nearly 10 years ago) that we auto-detected the
> memory  configuration  on  the  boards,  both for RAM and flash. Some
> boards / architectures did not bother  to  implement  this,  but  the
> feature itself is present.
>
> The  details  depend  on  processor,  memory  controller  properties,
> specific RAM types used, etc.
>
> In case of the Micron/Elpida issue on the ADS5121, that should be not
> too difficult to solve.
>   
The issue concerns the possibility to identify DDR chips type (e.g. by 
VendorId) before initialize them.
It doesn't concern configuration parameters (size, bus frequency, ecc..).
There isn't a DDR command to read this information, do you think it is 
possible to solve this problem in other ways?
> Best regards,
>
> Wolfgang Denk
>
>   


-- 

*Michele Jr **De Candia*

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