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.
