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From: Mark Meade <mark@lakeshoremicro.com>
To: Ilguiz Latypov <ilatypov@superbt.com>
Subject: Re: [patch] doc_stage1.S : GRUB on DoC
Date: Fri, 2 Aug 2002 15:49:39 -0400
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Ilguiz,

Indeed, the READID command doesn't seem to care what address is sent -- the 
answer came back correctly either way.

Here's what I've learned so far:

1)  The Grub CVS code (from 7/30), with the 2002-06-21 patch applied also 
causes the P133 machine to reboot.  This code has none of the combined 
doc_stage1/1b additions made in the 07-29 patch.

2)  The 0.92 Grub, with an earlier doc patch (I think it was 05-30) boots 
fine.

3)  Using the combined doc_stage1/1b with 0.92 Grub does not work.

Again, all three combinations above work just fine on the faster PC.

Item #1 seems to suggest that cvs grub may have introduced the problem, but 
in that case #3 should work.  Item #3 was patched manually (just doc_stage1.S 
and the Makefile), so it's possible I missed something else in your 07-29 
patch.

Anyway, is it possible to take an unmodified 0.92 Grub, and cleanly apply the 
latest (07-29) patch?  I was not able to do this, mainly because of automake 
version differences.  

Thanks,

Mark

Ilguiz Latypov wrote:
> I understand that the same register %di serves as the offset to the
> destination in RAM and as the offset in flash.  And stage2 or doc2000.c
> code will read chip ID from offset 0.  I think the offset may not be
> important because the READID command tells the chip to report the ID.