Wolfgang Denk <wd at denx.de> wrote?? > > Try trimming down the .config. For example, it doesn't look like you > > need IP_PNP enabled as you aren't NFSrooting and can just bring the > > interface up later. > > This depends. If the application needs network access, it is usually > faster to use IP_PNP instead of loading and running ifconfig and > route. [At least under 2.4; don't know timings for 2.6.]
OK.I tested with no IP_PNP,there was a 2 seconds decrease on boot time.After setting "verify=no" to mask CRC32 checksum,the boot time came to 11"78.Then without IP_PNP,the boot time was 9"69.Close to my expected 8 seconds.Yeah,there are some special option in my .config,like framebuffer and USB HOST mode configuration. I tried to optimize minimum access times for SDRAM in U-Boot,almost no obvious improvement.I need time to optimize SDRAM and FLASH access times.I took Wolfgang's example to use uncompressed kernel and ramdisk. Thanks a lot for your help. Sam ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
