[OLPC-devel] I'm blocked from testing the SPI flashing tool

[Ray.Tseng at quantatw.com]

Ron,
	As you asked SPI BIOS ROM should be conflicted with the FWH BIOS ROM. But it just works.
	The EC fetch code from SPI ROM; and CPU fetch code from FWH ROM.
	The EC code is the first 64K in SPI ROM, it can not be destroyed. Otherwise you can not power on the system.
	
 	You are right, just try to erase/program  64K~1M area at this moment
	
	Finally there will be no PLCC, the SPI ROM layout will be
	1) 64K EC
	2) 64K VSA
	3) ?K payload
	4) 32K Linuxbios
	sometimes EC update is also required, we should have 0~1M reflash ability then.

Ray Tseng 7/21/06 

-----Original Message-----
From: devel-bounces at laptop.org [mailto:devel-bounces at laptop.org] On Behalf Of Ronald G Minnich
Sent: Thursday, July 20, 2006 11:11 PM
To: Richard Smith
Cc: OLPC Developer's List
Subject: Re: [OLPC-devel] I'm blocked from testing the SPI flashing tool

Richard Smith wrote:
> I'm current blocked from testing/help hack Ron's mods to flashrom for 
> the SPI flash since I don't have any method of recovery other than 
> "send me a new board".
> 
> To unblock I need one of the following:
> 
> Info on how to recover from a failed SPI flash and force the system to 
> boot from the PLCC device.  I gather from Ron's post that if the EC 
> code gets hosed you can't power up.  I don't need EC keyboard support 
> since I'm 100% serial console.
> 
> or
> 
> Info on the pinout and voltage levels of CN20 so that I can build a 
> recovery system to access the flash directly.
> 
> Thanks.
> 

I'm thinking we should build linuxbios ALWAYS as a 1M-64K image and NEVER reflash the low 64k.

That way, you an always recover -- just plug in a PLCC. comments?

ron
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