On Fri, Apr 6, 2018 at 2:34 PM, Chris Green <[email protected]> wrote: > Robert Nelson <[email protected]> wrote: >> On Fri, Apr 6, 2018 at 1:17 PM, Chris Green <[email protected]> wrote: >> > Graham <[email protected]> wrote: >> >> >> >> From memory it was: >> >> >> >> Samsung 128GB up to 80MB/s EVO Class 10 Micro SDXC Card >> >> >> > Thanks, that gives me lots of 'headroom' when compared with what I'm >> > actually likely to need/use. >> >> fyi: You'll need to be careful with SDXC. The am335x mmc/sdio >> controller IP is only 100% rated for SDHC (max 32GB). (It doesn't >> support the new SDXC voltages or all the new speeds...) >> >> So stick with name brand "SDXC" microSD cards and test "1" before you buy >> many. >> >> Likewise here, Samsung/Sandisk SDXC's seem to work fine.. ;) >> > Thanks Robert, I don't even need anything like 32Gb, my 4Gb eMMC based > BBB (running Debian 7) is only half full still. Debian 9 won't need > much more space so I can still fit happily in 4Gb. > > My question was more to find out what microSD cards I could use for > installing the new OS. > > Plus I have two older BBBs with only 2Gb which is decidedly tight so > using a microSD card instead would provide more space so I can use > them as backup systems. Is there any difference in speed between eMMC > and microSD (though presumably SD cards vary in speed)?
Well the eMMC has a 8 bit interface (1), where as the microSD only has an 4 bit interface (2)... However even generic microSD's can be faster then the eMMC.. (kinda of a waste of the 8bit interface..) 1: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/am335x-boneblack-common.dtsi#n25 2: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/am335x-bone-common.dtsi#n397 Regards, -- Robert Nelson https://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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYhFzNf_p0nABjjNjC5xx9B4AiUxPDYLi27BtrYaTMmk0w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
