yaoshi, thanks for the link, that pretty well lays it out and gives what I was looking for as to what and why.
Eric On Wed, Jul 23, 2014 at 5:33 AM, liyaoshi <liyao...@gmail.com> wrote: > Its not about software , Its about how hardware implement a stack / spec. > > You can read this first , to understand how a sdxc stack runs failed on a > sdhc host > > https://www.sdcard.org/downloads/pls/simplified_specs/part1_410.pdf > > > 2014-07-23 12:25 GMT+08:00 Eric Fort <eric.f...@gmail.com>: > > so that sounds like a software issue not a hardware issue. When I refer >> to hardware I really mean the electrical signaling on the interface to the >> host. only thing I can think of there is some subsystem in an soc ends up >> being too smart for it's own good in trying to handle those commands such >> that the host never actually sees the commands being sent/received on the >> interface. cmd length sounds like a linux kernel driver issue. >> >> Eric >> >> >> On Tue, Jul 22, 2014 at 9:14 PM, liyaoshi <liyao...@gmail.com> wrote: >> >>> Its about sdhc cmd format ，some sdhc cmd/resp will get different length >>> from sdxc >>> >>> >>> 2014-07-23 11:03 GMT+08:00 Eric Fort <eric.f...@gmail.com>: >>> >>> so one is completely unable to reformat an SDXC card with another >>>> filesystem type such as ext3? Is it simply a filesystem issue or are there >>>> hardware differences to be overcome? >>>> >>>> Eric >>>> >>>> >>>> On Mon, Jul 21, 2014 at 8:40 AM, Robert Nelson <robertcnel...@gmail.com >>>> > wrote: >>>> >>>>> On Mon, Jul 21, 2014 at 10:34 AM, Eric Fort <eric.f...@gmail.com> >>>>> wrote: >>>>> > so can someone link to something definitive stating that for the >>>>> beagle bone >>>>> > (black) 32GB SDHC is the biggest card supported (assuming this is >>>>> correct)? >>>>> >>>>> From: >>>>> http://en.wikipedia.org/wiki/Secure_Digital#SDXC >>>>> >>>>> The Secure Digital eXtended Capacity (SDXC) format, announced in >>>>> January 2009 and defined in Version 3.01 of the SD specification, >>>>> supports cards up to 2 TB (2048 GB), compared to a limit of 32 GB for >>>>> SDHC cards in the SD 2.0 specification. SDXC adopts Microsoft's exFAT >>>>> file system as a mandatory feature. >>>>> >>>>> aka: >>>>> microSDHC 32GB is your limit.. >>>>> >>>>> Regards, >>>>> >>>>> -- >>>>> Robert Nelson >>>>> http://www.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 beagleboard+unsubscr...@googlegroups.com. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>>> 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. >>>> >>> >>> -- >>> 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. >>> >> >> -- >> 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. >> > > -- > 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. > -- 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.
