From mboxrd@z Thu Jan 1 00:00:00 1970 From: York Sun Date: Wed, 20 Oct 2004 16:21:37 -0500 Subject: [U-Boot-Users] CFI driver In-Reply-To: <1098304836.14086.74.camel@localhost.localdomain> References: <1098300371.14086.63.camel@localhost.localdomain> <16758.51296.95076.193532@astp0002.localdomain> <1098304836.14086.74.camel@localhost.localdomain> Message-ID: <1098307296.14086.84.camel@localhost.localdomain> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Yuli, I add the following test code and modified flash_status_check. I have no error for erasing. But I got "Time out" for programming after 13KB. This algorithm complies AMD standard, doesn't it? Regards, York #define AMD_STATUS_TIMEOUT 0x20 static int flash_time_out (flash_info_t * info, flash_sect_t sect) { int retval; switch (info->vendor) { case CFI_CMDSET_AMD_STANDARD: case CFI_CMDSET_AMD_EXTENDED: retval = flash_isset (info, sect, 0, AMD_STATUS_TIMEOUT); break; default: retval = 0; } debug ("flash_time_out: %d\n", retval); return retval; } static int flash_status_check (flash_info_t * info, flash_sect_t sector, ulong tout, char *prompt) { ulong start,now; /* Wait for command completion */ start = get_timer (0); while (flash_is_busy (info, sector)) { if (flash_time_out(info,sector)) { if (flash_is_busy (info, sector)) { flash_write_cmd (info, sector, 0, info->cmd_reset); printf("Time out\n"); } } if ((now=get_timer (start)) > info->erase_blk_tout * CFG_HZ) { printf ("Flash %s timeout at address %lx data %lx\n", prompt, info->start[sector], flash_read_long (info, sector, 0)); flash_write_cmd (info, sector, 0, info->cmd_reset); return ERR_TIMOUT; } } return ERR_OK; } On Wed, 2004-10-20 at 15:40, York Sun wrote: > Yuli, > > Thanks for reply. > > I am using a single chip. The problem doesn't appear EVERY programming. > It happens after programming about 13KB. > > I did this test. In function "flash_status_check ( )", within the while > loop, I insert codes to read DQ7-DQ0. I got DQ6 toggling and DQ5=1. That > means "exceeded timing limit". Without a reset the program will hang in > this loop. By polling the DQ7 instead of DQ6, it went smoothly. > > York > > On Wed, 2004-10-20 at 15:19, Yuli Barcohen wrote: > > >>>>> York Sun writes: > > > > York> I am debugging flash driver for MPC8555CDS board. The driver > > York> is drivers/cfi_flash.c. I have two boards. One is rev 1.0, > > York> with AM29LV641D. The other is rev 1.1, with AM29LV641M. > > > > York> The problem is polling DQ6 after programming. The current > > York> driver in U-boot 1.1.2 works well for AM29LV641M. As for > > York> AM29LV641D, the programming hangs after writing about 13KB. I > > York> track it down to "flash_is_busy()" function. When the problem > > York> occurs, the DQ6 keeps toggling. If I change the algorithm to > > York> polling DQ7, no problem occurs. > > > > I'm working now with a board (Adder87x) having exactly the same flash > > (AM29LV641DL) and the driver works perfectly. I suspect that the problem > > is not in the chip but in specific configuration. > > > > York> Shawn has a similar problem > > York> http://lists.infradead.org/pipermail/linux-mtd/2004-March/009402.html. > > > > Your board uses several chips in parallel to get wider bus. The same was > > on Shawn's board. In older versions of Linux CFI driver I found a bug in > > the polling algorithm when more than one chip is used. I just replaced > > the driver with a newer version and now it works OK. It sounds like > > similar (same?) bug in the U-Boot's CFI driver. > > > > York> Maybe we should use DQ7 rather than DQ6. > > > > IMHO, no. Polling DQ6 is the standard for AMD-compatible flashes. > > > > ... > > > > ------------------------------------------------------- > This SF.net email is sponsored by: IT Product Guide on ITManagersJournal > Use IT products in your business? Tell us what you think of them. Give us > Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more > http://productguide.itmanagersjournal.com/guidepromo.tmpl > _______________________________________________ > U-Boot-Users mailing list > U-Boot-Users at lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/u-boot-users -- Best regards, York Sun, Ph.D Metrowerks Freescale Semiconductor Inc. Phone: (512) 996-5252 Email: yorksun at freescale.com This email, and any associated attachments have been classified as: [x] Freescale Semiconductor General Business [ ] Freescale Semiconductor Internal Use Only [ ] Freescale Semiconductor Confidential Proprietary -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.denx.de/pipermail/u-boot/attachments/20041020/31efa762/attachment.htm