[U-Boot-Users] Support for AMD Flash SecSi Sector

[Brad Kemp]

Josef,

Intel has a similar construct in the strataflash device. Each chip has 64 bits of factory programmed serial number and 64 bits of user information that can be written once. I currently store the mac address and serial number in the user write once area. 

One of the issues is how this area should be returned in a parallel implementation.  Should a read of this area return each chips protected area or should a read of this area return the area as it is addressed.

When reading the factory serial number, all the bits of a chip must be read to insure uniqueness.

In a by 4 parallel implementation reading the information by location, to guarantee uniqueness, the application must read 256 bits for Intel and 512 bits for AMD.  While the size is not large, if there is need of the user to see this, it is a very long string.

 If a read returns each chips protected area serially, only one chips worth of data is needed to determine uniqueness.

Brad

 

	-----Original Message----- 
	From: Josef Baumgartner [mailto:josef.baumgartner at telex.de] 
	Sent: Fri 1/30/2004 5:20 AM 
	To: u-boot-users at lists.sourceforge.net 
	Cc: 
	Subject: [U-Boot-Users] Support for AMD Flash SecSi Sector
	
	

	Hi,
	
	we use an AMD 29LV640D flash on our MCF5272 board. This flash has a 128 Word
	sector called SecSi which is one time programmable. We'd like to use the
	SecSi sector of the flash to store board information, as serial number and
	ethernet MAC address.
	
	I'll start to implement support for the SecSi sector in u-boot. Is there
	anybody, still working on this topic? Are there any suggestions how to
	implement it?
	
	I think of adding some special commands in cmd_flash.c to read and prog the
	SecSi sector. Additionally I would change the read function for the "ethaddr"
	to use the SeCsi sector instead of the environment.
	
	Regards,
	
	Josef Baumgartner
	
	
	
	
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