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Date: Tue, 20 Jan 2004 19:32:20 -0600
From: Bill Gatliff <bgat@billgatliff.com>
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Subject: Re: Intel flash and cfi_probe.c
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David:


I had seen the lines of code that Thayne had referred to; there are 
other exit paths out of that code that leave the flash in READ STATUS 
mode, apparently.  Haven't researched it enough yet.

Let me know what, if anything, I can do to help!


b.g.


David Woodhouse wrote:

>On Tue, 2004-01-20 at 13:50 -0800, Dan Post wrote:
>  
>
>>Hi,
>>
>>I was looking at the cfi_probe.c file, and noticed that there are numerous
>>'0xF0' commands to flash (theoretically to put the flash back into read array
>>mode).  This is incorrect in terms of Intel flash; according to the datasheets
>>for L18/30 and K3/18, the "read array" command is 0xFF.
>>    
>>
>
>Yeah.... the CFI spec says how to get into query mode, but unfortunately
>doesn't specify how to get out of it. And without getting out of it we
>can't check for aliases.
>
>We'd previously observed that 0xF0 happened to work for Intel chips...
>now evidently it doesn't any more. I suspect we might just have to bite
>the bullet and make it depend on the chip type, although it was easier
>to avoid that.
>
>  
>
>>What would happen if we issued an 0xF0;0xFF to an AMD chip?  Or 0xFF;0xF0? 
>>Any AMD chip-heads care to answer?  It looks like it will "work" on Intel chips...
>>    
>>
>
>Hmmm. That could work.
>
>  
>

-- 
Bill Gatliff
Embedded GNU, Linux, and other board support packages.
bgat@billgatliff.com