Fwd: Adding a system management MPU

Wolfgang Spraul wolfgang at openmoko.com
Thu Mar 20 07:54:57 CET 2008


fyi

Begin forwarded message:

> From: Werner Almesberger <werner at openmoko.org>
> Date: March 19, 2008 5:49:01 AM GMT+08:00
> To: Andy Green <andy at openmoko.com>
> Subject: Re: Adding a system management MPU
>
> 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).
>
>> 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 ...
>
> I may sounds overly sceptical here, but generously interpreting vendor
> information in our favour has led us to bitter disappointments already
> more than once. So I wouldn't take anything for granted unless we have
> tangible results or explicit promises. (Well, even these weren't  
> always
> kept. It's a jungle out there ...)
>
> Cheers, Werner

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