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.
