I got over 30MB/s read speed on freescale iMX6 with 8bit eMMC 4.4 spec @49.5M :)
2013/12/17 William Hermans <[email protected]> > The device tree file for the BBB shows it in 8bit mode. > > What I am thinking is that perhaps the low level block device driver in > the kernel needs optimizing. That and it is not specific to the eMMC > either. I have no proof here, I have just been noticing a trend with 21MB/s > about the ceiling for storage speeds. Booting from USB also shows hdparm > speeds max of 21MB/s( writes ) with reads at 10MB/s. The write / read > speeds seems to be swapped when compared to an x86 Windows, or Linux > system. So yeah, seems a bit fishy to me. > > > On Mon, Dec 16, 2013 at 1:12 PM, Gerald Coley <[email protected]>wrote: > >> I agree.I suspect that the eMMC is actually set to 4bit in some of the >> kernels and there may be other issues going on as well.. >> >> Gerald >> >> >> On Mon, Dec 16, 2013 at 12:52 PM, John Syne <[email protected]>wrote: >> >>> >>> >>> From: Gerald Coley <[email protected]> >>> Reply-To: <[email protected]> >>> Date: Monday, December 16, 2013 at 6:34 AM >>> To: "[email protected]" <[email protected]> >>> Cc: <[email protected]> >>> Subject: Re: [beagleboard] Boot Android from eMMC without Micro SD ?? >>> >>> eMMC runs at 48MHZ. >>> uSD runs at 48MHz. >>> eMMC is 8bit. >>> uSD is 4bit. >>> >>> Hi Gerald, >>> >>> Based on the specs, you would think that eMMC would run faster, but it >>> doesn’t. Run the following Linux command to test the speed of each device: >>> sudo hdparm –tT /dev/mmc0blk0p1 >>> >>> SDCard 21MB/s >>> eMMC 12MB/s >>> >>> This doesn’t make sense, but perhaps there is something else going on. >>> >>> Regards, >>> John >>> >>> >>> Gerald >>> >>> >>> >>> On Mon, Dec 16, 2013 at 8:29 AM, Efecan Yilmaz < >>> [email protected]> wrote: >>> >>>> I'm not an expert but I think, If you want speed, you should use an SD >>>> cards like this: >>>> >>>> >>>> http://www.samsung.com/uk/consumer/memory-cards-hdd-odd/memory-cards-accessories/micro-sd-plus-accessories/MB-MPAGA/EU?subsubtype=micro-sd-plus-accessories >>>> >>>> or something which has min 30 mb/s read speed. I'm using the one in the >>>> link and my Beaglebone is working without a problem with TI's Android >>>> image. Don't waste your time trying to boot Beaglebone from eMMC. If you >>>> use a high speed SD card you'll get better performance. >>>> >>>> >>>> On Monday, 16 December 2013 08:22:58 UTC+2, [email protected] wrote: >>>>> >>>>> Hi Gerald, >>>>> >>>>> Could you please tell us how this is possible as i also want to flash >>>>> android or even ubuntu desktop on eMMC. b'coz i want to speed up the OS. I >>>>> have ubuntu on sdCard but it is very slow. >>>>> >>>>> On Monday, September 2, 2013 5:19:33 PM UTC+5:30, Gerald wrote: >>>>> >>>>>> Oh, I understand totally. But, the idea is to make sure the board is >>>>>> OK and functioning, so that is what I suggest going back to the factory >>>>>> image to make sure. Then work the Android issue. I don't know of anyone >>>>>> that has flashed the eMMC with an Android image. everything i have seen >>>>>> so >>>>>> far is SD card booting only. But it should be possible. >>>>>> >>>>>> Gerald >>>>>> >>>>>> >>>>>> >>>>>> On Mon, Sep 2, 2013 at 3:50 AM, Efecan Yilmaz >>>>>> <[email protected]>wrote: >>>>>> >>>>>>> Hi Gerald. Thanks for the answer. But I'm not trying to boot Android >>>>>>> from SD card. I'm trying to flash Android files into onboard eMMC. I >>>>>>> want >>>>>>> to boot Android without SD card. >>>>>>> >>>>>>> >>>>>>> On Thursday, 29 August 2013 17:29:52 UTC+3, Gerald wrote: >>>>>>> >>>>>>>> Did you look here? >>>>>>>> >>>>>>>> http://circuitco.com/support/index.php?title=Android >>>>>>>> >>>>>>>> Gerald >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Thu, Aug 29, 2013 at 9:17 AM, Efecan Yilmaz < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> I'm trying to flash Android into eMMC. I wrote an Angstrom image >>>>>>>>> into an SD card. I booted BBB wtih that SD card. I create three >>>>>>>>> partions on >>>>>>>>> eMMC for Android via terminal in Angstrom. From this point, I'm not >>>>>>>>> sure >>>>>>>>> which files I must copy to eMMC's boot and rootfs partitions. And I >>>>>>>>> think I >>>>>>>>> must modify some files because I used an image which runs on SD card >>>>>>>>> (I >>>>>>>>> think I must change mmcblk0 references to mmcblk1). Long story short: >>>>>>>>> >>>>>>>>> 1) Which files I need to copy to eMMC's which partitions? >>>>>>>>> 2) Which files should I modify for my image to run on eMMC? >>>>>>>>> (mmcblk0 to mmcblk1 problem) >>>>>>>>> >>>>>>>>> If you can help me, I'll be grateful :) >>>>>>>>> And sorry for my English :) >>>>>>>>> >>>>>>>>> -- >>>>>>>>> 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]. >>>>>>>>> >>>>>>>>> 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 [email protected]. >>>>>>> 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 [email protected]. >>>> 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 [email protected]. >>> 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 [email protected]. >>> 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 [email protected]. >> 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 [email protected]. > 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 [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
