Post- GTA02

[Andy Green]

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Hi folks -

We had some internal talk about how to go post GTA02 and Wolfgang wants
us to make it external.

We have a choice about basing on S3C2443 or S3C6400.  A lot of the info
is confidential but not these high level things which are public domain
on Samsung's site.

S3C2443 is an 130nm incremental improvement over the 2442 in GTA02 with
480Mbps USB Device (not OTG) and better clock scaling.  It can accept
x16 DDR memory.

S3C6400 is 90nm and has 480Mbps USB2 OTG, 667MHz max clock, some 2D
acceleration and can accept x32 DDR memory.

http://www.samsung.com/global/business/semiconductor/productInfo.do?fmly_id=229&partnum=S3C6400
http://www.samsung.com/global/system/business/semiconductor/product/2007/8/21/661267ptb_s3c6400_rev15.pdf

I like the 6400 better but information is a bit scarce right now and it
can go either way.

Some other concepts kicked around:

 - Merge the debug board function on to the phone, perhaps with internal
micro USB used for debricking and hacking.  No write-once memory.

 - Discard U-Boot, minimal bootloader direct to kernel

 - Focus on SD Card rootfs rather than internal memory

 - Add a small lowpower MPU like TI MPS430 to manage everything
seamlessly when main CPU is down.  Stuff like motion sensors, wake
sources, battery management, maybe touchscreen, leds so there is an
always-on "guiding hand" in the phone that is consistent and reliable

To be clear though -- GTA02 is soon going to actually exist, and this is
just future talk right now.  But because of that, if you have any ideas
about future arch, now is the time to throw them in and they will at
least get the time of day.

- -Andy
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