Hi RobertCNelson, >PS, the factory default eMMC on these boards isn't known for speed, >the version used is more for reliability.. I understand that the default eMMC on the board is unpublished in speed and version and unreliable, is that correct? If the eMMC or Data Bus Width is HS400 Mode 8bit or Clock Frequency is 200MHz, does it need to be set and the startup speed is even faster?
Regards, 2021年2月24日水曜日 13:22:50 UTC+9 Dennis Bieber: > On Tue, 23 Feb 2021 18:30:40 -0800 (PST), in > gmane.comp.hardware.beagleboard.user ha ppay > <andocn777-re5jqe...@public.gmane.org> wrote: > > >Hi Dennis Bieber > > > >Thank you for the detailed explanation of the SD card standard (class) > and > >features. > > > >>The SanDisk Class 4 was easily 8 times faster than the Kingston Class > >>10 for regular write, rewrite, and random write, and was also faster (if > >>not as much) for read/reread/random read. > >We will use it as a reference when selecting an SD card. > >It turns out that like SD cards, MMCs have completely different transfer > >rates. > >>https://en.wikipedia.org/wiki/MultiMediaCard#Table > >so many version... > >Is the transfer speed of MMC completely different like SD card? > > > > I would suspect the primary factor is the on-chip /controller/ section > -- which is responsible for handling the erasure/reuse of allocation units. > There may be some effect if the flash memory itself is NAND or NOR type. > > See https://www.pidramble.com/wiki/benchmarks/microsd-cards > > While that site is focused on the Raspberry Pi, the benchmarks WILL run > on a Beaglebone (though one test won't run on the eMMC -- the script is > still trying to access the SD card for that test). > > > -- > Dennis L Bieber > > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/86ca97bc-472a-461a-a44d-e85f2dee6822n%40googlegroups.com.
