[U-Boot-Users] Intel StrataFlash 28F128J3 vs. 28F256K3
Robert Whaley
rwhaley at applieddata.net
Tue Dec 21 16:00:46 CET 2004
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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