[U-Boot-Users] Intel StrataFlash 28F128J3 vs. 28F256K3

[Robert Whaley <rwhaley@applieddata.net>]

Hi Craig,

Sounds like you may have some other issues too, but one frustrating 
difference between the K and the J parts is that the K parts lock all 
the blocks on power up reset (compare sections 13 of the respective K 
and J data sheets).  So, to erase or write a block, the block needs to 
be unlocked first (I'm talking about the locks in the flash part, not 
the U-boot software locks).

Putting something like this before erases and writes resolves this issue.

#ifdef CFG_UNLOCK_BEFORE_ERASE
	flash_write_cmd (info, sect, 0, FLASH_CMD_CLEAR_STATUS);
	flash_write_cmd (info, sect, 0, FLASH_CMD_PROTECT);
	flash_write_cmd (info, sect, 0, FLASH_CMD_PROTECT_CLEAR);
#endif

Hope this helps.

Robert

Craig A. Vanderborgh wrote:
> Hello,
> 
> I am bringing up u-boot on a new revision of our board and I am having a 
> problem with flash.  Both boards have share *exactly* the same 
> schematic, with just one difference.  The newer board has 2 Intel 
> 28F256K3 flash chips in a single bank versus 2 Intel 28F128J3 flash 
> chips in a single bank on the older board.
> 
> I am inexperienced with this flash stuff, so bear with me.  What I am 
> seeing is very strange.  The board comes up, and everything works except 
> flash.  u-boot comes up, serial works fine, DRAM works fine.  Flash does 
> not work right.  Here is what I am seeing.
> 
> 1. Using JTAG, I can program the 1st sector of flash successfully.  This 
> works and I am using this mechanism to boot the board.
> 2. Using JTAG or u-boot flash commands, erasing appears to work for all 
> sectors > sector 0.  Programming does NOT work.  The low-order bits (for 
> bytes 1&2) are programmed correctly.  The high-order bits (for bytes 
> 3&4) are LOST, and thus every 32-bit word contains "ff" as the 
> high-order bytes after programming.
> 
> I have made ABSOLUTELY CERTAIN that all my PXA register settings are 
> correct.  The same flash code (within u-boot) works correctly on the 
> older board (with the J3's).  I am very stuck - and I would appreciate 
> some help.  I have spent a vast amount of time on this problem and I 
> would dearly love any bone that might be tossed from the U-Boot gurus.
> 
> Thansk in advance,
> craig vanderborgh
> voxware incorporated
> 
> 
> 
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