From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Danter Date: Tue, 12 Jul 2005 20:38:25 +0100 Subject: [U-Boot-Users] AMD29LV800T in 16bit mode x4 devices (64bit bus) In-Reply-To: <20050711210531.C1103353AED@atlas.denx.de> References: <20050711210531.C1103353AED@atlas.denx.de> Message-ID: <42D41C31.2090903@ntlworld.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Wolfgang Denk wrote: > In message <42D2DC59.6090507@ntlworld.com> you wrote: > >>Is there a driver that supports this flash within U-Boot? I can't see >>one, but want to make sure I didn't miss it before I reinvent the wheel! > > There are several. First, there is the general CFI driver, and then > there are several board specific drivers like board/tqm8260/flash.c I have tried both of the suggested drivers with neither working for me. I have spent more time looking at the tqm8260/flash.c and have managed to make some improvements. Initially it was unable to even read back the device type but I noticed that if I single stepped (using JTAG) the flash_get_size() function then it _was_ able to correctly read the device type. This sounded like a timing issue until someone suggested that between the writes and reads I should have "sync" and/or "eieio" to ensure the CPU (MPC7400) does not execute them out of sequence. This certainly fixed the flash_get_size() function, but I am still unable to write to the flash (eg using saveenv). Though again I do see some data written if I am single-stepping the write_dword() function. Reading data from the flash works just fine. Any suggestions? Thanks Rich