From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Whaley Date: Tue, 21 Dec 2004 10:00:46 -0500 Subject: [U-Boot-Users] Intel StrataFlash 28F128J3 vs. 28F256K3 In-Reply-To: <41C7C7CC.2040801@voxware.com> References: <41C7C7CC.2040801@voxware.com> Message-ID: <41C83A9E.3000604@applieddata.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 > > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://productguide.itmanagersjournal.com/ > _______________________________________________ > U-Boot-Users mailing list > U-Boot-Users at lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/u-boot-users >