From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Mack Date: Thu, 19 Mar 2015 16:56:24 +0100 Subject: [U-Boot] am335x: GPMC: reading speed with prefetch mode In-Reply-To: References: <550AD57A.4070701@zonque.org> Message-ID: <550AF1A8.8030402@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 03/19/2015 04:13 PM, Yegor Yefremov wrote: > Strange. Have tried with "nand read" command, but still the same > result with and without CONFIG_NAND_OMAP_GPMC_PREFETCH : > > [2.150655 0.001006] NAND read: device 0 offset 0x260000, size 0x1200000 > [15.978943 13.828288] 18874368 bytes read: OK What about adding some debug prints to the prefetch setup function and see if it is executed at all? > Daniel, do you have the numbers? Images size and load time? What can I expect? I don't currently have the setup at hand, sorry. But the number I recall from an email conversation back then is: The time from power-on, loading SPL, loading U-Boot, leeching a 6MB uImage, jumping into it waiting for the console to start dumping the kernel boot messages was less than 5 seconds in total. Thanks, Daniel