Fwd: Adding a system management MPU

Wolfgang Spraul wolfgang at openmoko.com
Thu Mar 20 07:55:51 CET 2008


fyi

Begin forwarded message:

> From: Andy Green <andy at openmoko.com>
> Date: March 19, 2008 6:19:50 AM GMT+08:00
> To: Werner Almesberger <werner at openmoko.org>
> Subject: Re: Adding a system management MPU
>
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> Somebody in the thread at some point said:
>> Andy Green wrote:
>>> 128MBytes of DDR that is in the 6400 MCP can be OK... "too little"  
>>> for
>>> what?
>>
>> s3c6400_rev15.pdf, which seems to be our latest source (?), only has
>> these packages (page 10):
>>
>> - 256MB OneNAND + 64MB mDDR, or
>> - 128MB NAND [1] + 64MB OneDRAM [2] + 64MB mDDR
>>
>> [1] plain "NAND" probably has the same useless protection the one in
>>    our 2442 MCP has, which made us add the NOR.
>> [2] no idea how this compares with mDDR. It's probably slower but  
>> more
>>    expensive (dual-ported).
>
> On p34 and p35 of some powerpoint presentation from March 2007, they
> mention 2Gb OneNand + 2 x 512Mb "DRAM", which is 256KBytes NAND and
> 128KBytes "DRAM".  If it later became 64MBytes only that would be
> starting to get a bit cramped.
>
> Clearly we need to hear the reality about which versions can  
> actually be
> had from Samsung and what that does to the pricing.
>
>>> In terms of work the last data we got says they upleveled their  
>>> BSP to
>>> 2.6.21
>>
>> You mean latest data from "S3C6400_6410 feature_070713.pdf" ?
>>
>> That file seems to be from July 2007, which is basically when their
>> roadmap says they'll start 2.6.21 development. We can hope they did
>> indeed do this, and have results by now, but then you never know ...
>
> Yeah the data from July 2007 shows they started on 2.6.21 in June  
> 2007,
> for release in Nov 2007.  So: "the last data we got says they  
> upleveled
> their BSP to 2.6.21".
>
> - -Andy
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