From: Ulf Samuelsson Date: Mon, 5 Mar 2007 10:37:30 +0100 Subject: [U-Boot-Users] Configure the wait states References: <1172843556.a240927cTDE02003@stud.mah.se> Message-ID: <026001c75f09$f1737ad0$d389fea9@atmel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de >> -----Original Message----- >> From: Ulf Samuelsson [mailto:ulf at atmel.com] >> Sent: Friday, March 02, 2007 9:02 AM >> It is possible to change anything in U-Boot source, but >> I am not sure U-boot supports writing to the EBI while you are executing >> from SDRAM >> >> The bus will run the internal/external bus at a fraction of the CPU speed. >> I believe you should be able to run the bus at 80 Mhz or so, but >> that means that you have to reduce the CPU speed to 160 MHz >> from 180 MHz, and I am not sure you gain anything in the process. > > Ok, my application runs at 45 MHz. Therefore I guess it's possible to laborate with the wait states value and gain speed. > > Greetings > Joakim Nordell IMHO , If you are booting from dataflash, the correct place to fix this is in the dataflashboot.bin Best Regards Ulf Samuelsson