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Date: Thu, 21 Oct 2004 09:32:20 +0200
From: christoph glaeser <christoph.glaeser@truetzschler.de>
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Subject: JFFS2 problem on ST M29W640DB (90 ns)
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Hello,

the problem is the Flash ST-M29W640DB itself:

"The Read/Reset command must be issued to return the device to the 
previous mode (the Read Array mode or Autoselected mode). A second 
Read/Reset command would be needed if the device is to be put in the 
Read Array mode from Autoselected mode."

To solve this problem, change the funktion "cfi_cmdset_0002()" in File 
"cfi_cmdset_0002.c":

  ...
  cfi_send_gen_cmd(0xf0, 0x55, base, map, cfi, cfi->device_type, NULL);
  
/***********************************************************************************************/
  /* Fixed 20.10.2004 (C.Gl.)                  
                                                  */
  
/*                                                                                             
*/
  /* Probleem: Flash ST 
M29W640DB                                                                */
  /* If the Chip is in "Read CFI Query Command"-Mode, the first 
"Read/Reset"-Command will turn   */
  /* the Flash back to previous mode (=Autoselet-Mode); a second 
"Read/Reset"-command would be   */
  /* needed if the device is to be put in the "Read Array"-mode from 
Autoselected mode!          */
  
/*                                                                                             
*/
    cfi_send_gen_cmd(0xf0, 0x55, base, map, cfi, cfi->device_type, NULL);
  
/***********************************************************************************************/
    return cfi_amdstd_setup(map);
}

Good Luck,

Christoph Glaeser