This is depends on your SOC main clock and cache size and nand /eMMC read speed If on 512K L2 cache and over than 1G ， lzo MAYBE will beat uncompressed but in less than 500M and with very fast nand 16bit EDO ddr mode /eMMC 50M@8bit with ADMA what I get test result is raw (uncompressed) kernel image will be the better choice on iMX6
You can see the test result from the link , None69656444.62674904.626749Ti dont have eDMA and ADMA enable as default in previous u-boot driver While this is patched in 2014.04 version on omap5 and dra7x driver It wont take over than 1s while loading 6M size kernel image What I test on imx6 , u-boot with ADMA driver enable on eMMC 4.4 @8bit 50M Will over than 15MBytes /s And with APBH DMA enable in 8bit nand driver @100M EDO mode enable Will over than 15MBytes/s too So , what I suggest , you should check your u-boot driver , and make sure ADMA enable for eMMC/sd 2014-11-12 9:37 GMT+08:00 Robert Nelson <robertcnel...@gmail.com>: > On Tue, Nov 11, 2014 at 7:09 PM, liyaoshi <liyao...@gmail.com> wrote: > > If this is for automotive ，systemd is not so useful > > last mode is required when in automotive enviroment > > while as I know systemd can not turnning boot sequence for different > modules > > If not about automotive ,skip this . > > And，if only talking about 0.5s or 1s , its only about u-boot and kernel > > > > what I test in imx 6 , whats' my test result is boot from nand slc > onfi1@80M > > Arm@800M with 16bit DDR@400m > > > > unless you remove kernel printk, its possible boot less than 1s > > > > remove any print out from serial ,boot loader turn mmu can cache on > > > > load kernel with uncompressed and make small than 4M,without prink > > but also double check with lzo... As it can beat uncompressed... > > http://free-electrons.com/blog/arm-xz-kernel-decompression-benchmarks/ > > Regards, > -- > Robert Nelson > http://www.rcn-ee.com/ > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
