From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aras Vaichas Subject: AT91SAM9G20 design and boot times Date: Thu, 11 Jun 2009 13:43:18 +1000 Message-ID: References: Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-embedded@vger.kernel.org Hi, we're designing our next generation RFID reader and I'm planning on using the AT91SAM9G20 in the next design. We currently use the AT91RM9200. Can I get some feedback from people with regards to general design configurations that affect the boot time with respect to this CPU (or the AT91SAM9260) Some questions are: * what is your boot time? What is the time from power-on to kernel running, how long does the kernel take to run until init starts, and how long does init take? * what is your system hardware configuration? CPU+NAND, CPU+NOR+NAND, CPU+DATAFLASH+NAND? * do you boot everything from the NAND or do you use a combination of Dataflash/NOR and NAND? * do you use U-Boot, or a minimal custom bootloader that copies a kernel image from NAND to SDRAM and then executes it? * do you mount a small partition of the NAND to begin with and then mount the rest later? * do you have a monolithic kernel, or is it split into minimal with modules loaded from, say, JFFS2 on NAND? * are you using JFFS2 or UBIFS? Any info is much appreciated, thank you! regards, Aras Vaichas