eMMC controller on am335x is up to 4.3 and SD spec up 2 SD2.0, so . on this board .eMMC speed should faster than SD card
Just as an additional On omap5 and iMX6 , and almost other recently SOC , they will support eMMC 4.4 and SD 3.0 eMMC 4.4 spec define 50M clock DDR mode and 8bit data ,bandwidth is 800Mbps But SD3.0 spec define SD104 while clock up to 200M , so the bandwidth is also 800Mbps use sd card benifit is easy to replace . and easy to upgrade . Since I get a bricked samsung S3 , I feel so strong about sdcard rootfs is necessory . 2014-03-06 23:52 GMT+08:00 Gerald Coley <ger...@beagleboard.org>: > Cost. That is what a $45 board allows us to buy. 4G is more expensive than > 2G, And eMMC is faster and more reliable than an SD card. > > > Gerald > > > > On Thu, Mar 6, 2014 at 9:49 AM, Brad Hopper <brad.hop...@gmail.com> wrote: > >> I wonder why the BBB has "only" 2G of space in the eMMC - aren't most >> "small" boot images designed to fit in 4G? It's *great* to have onboard >> bootable space, just seems like it would be bigger or why bother since >> many/most will just end up not using it and booting from flash. >> >> >> On Thursday, February 13, 2014 2:48:14 PM UTC-5, Rusty Wright wrote: >>> >>> >>> If I plan to only boot to the SD card, why would I want/need to flash >>> the eMMC with the latest? >>> >>> This may be answered by the previous question's answer; does flashing >>> the eMMC update the >>> lowest level, stage 1, or whatever it's called (whatever's not in the >>> DOS partition) u-boot code? >>> I guess I'm assuming that the lowest level boot code is u-boot, but >>> perhaps that's incorrect. >>> >> -- >> 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/groups/opt_out. >> > > -- > 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/groups/opt_out. > -- 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.
