Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75
Based on that error message, my guess is that those Sandisk cards are the first to support +1.8V operation. The kernel is detecting this, but getting confused as it doesn't know how to turn on +1.8V power to the SD (it isn't supported by that motherboard). On XO-1.5, we supported operating SD cards at +1.8V, but since we never encountered such a card the feature was dropped in XO-1.75/XO-4. All cards have to support operation at the +3.3V these systems provide. The kernel should recognize this limitation, and not try to negotiate for lower voltages. This sounds like a bug in build 21, please file a ticket. Thanks, wad On Oct 7, 2012, at 7:33 AM, George Hunt wrote: Hi all, I've been working on a XO-1.75 as XS project. The smallest form factor XS would use an SD card for School Server storage. So I purchased fast, large SD cards from Amazon. These cards work in my mac, and they initialize, and appear to work on the XO-1.5 running build 860. The XO-1.75 software is build 21 (12.1.0), firmware is Q4D17. The error message in the /var/log/messages is: Oct 7 11:18:44 schoolserver kernel: [157819.81] sdhci: Switching to 1.8V signalling voltage failed, retrying with S18R set to 0 Oct 7 11:18:44 schoolserver kernel: [157819.876896] mmc0: error -110 whilst initialising SD card In my reading about SD cards, I discover that some SD cards are not genuine. I have looked at /sys/... and the manufacturing number was 003 which is appropriate for sandisk. This error message is mentioned in Ticket #11736 I'd be happy to give more info, or do testing. George ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75
Hi, On Thu, Oct 18 2012, John Watlington wrote: The kernel should recognize this limitation, and not try to negotiate for lower voltages. This sounds like a bug in build 21, please file a ticket. I just pushed a change to arm-3.0-wip that might fix this -- George, please can you test? Thanks, - Chris. -- Chris Ball c...@laptop.org http://printf.net/ One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75
All my XO-1.75's are prepped for the SF summit this weekend. I can do it after Sunday. George On Thu, Oct 18, 2012 at 3:22 PM, Chris Ball c...@laptop.org wrote: Hi, On Thu, Oct 18 2012, John Watlington wrote: The kernel should recognize this limitation, and not try to negotiate for lower voltages. This sounds like a bug in build 21, please file a ticket. I just pushed a change to arm-3.0-wip that might fix this -- George, please can you test? Thanks, - Chris. -- Chris Ball c...@laptop.org http://printf.net/ One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Sandisk extreme 32GB and 16GB dont initialize in XO-1.75
Hi all, I've been working on a XO-1.75 as XS project. The smallest form factor XS would use an SD card for School Server storage. So I purchased fast, large SD cards from Amazon. These cards work in my mac, and they initialize, and appear to work on the XO-1.5 running build 860. The XO-1.75 software is build 21 (12.1.0), firmware is Q4D17. The error message in the /var/log/messages is: Oct 7 11:18:44 schoolserver kernel: [157819.81] sdhci: Switching to 1.8V signalling voltage failed, retrying with S18R set to 0 Oct 7 11:18:44 schoolserver kernel: [157819.876896] mmc0: error -110 whilst initialising SD card In my reading about SD cards, I discover that some SD cards are not genuine. I have looked at /sys/... and the manufacturing number was 003 which is appropriate for sandisk. This error message is mentioned in Ticket #11736 I'd be happy to give more info, or do testing. George ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel