Sandisk extreme 32GB and 16GB dont initialize in XO-1.75

[George Hunt]

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
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Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75

[George Hunt]

Just a word of thanks to Mikus. I tried the Transcend 32G, only $22, from
Amazon. It was recognized.

On Sun, Oct 7, 2012 at 10:17 AM, Mikus Grinbergs  wrote:

> I have a "permanent" SD card inserted into the (bottom) external slot of
> each of my XOs.  To date, I'm happily using a Transcend 16GB card in an
> XO-1.75 running 13.1.0 os4.   {I purchased that SD card from Amazon because
> it was cheap.)
>
> mikus
>
>
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Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75

[John Watlington]

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
> 
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Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75

[Jerry Vonau]

filed 

http://dev.laptop.org/ticket/12216

Jerry

On Thu, 2012-10-18 at 14:48 -0400, John Watlington wrote:
> 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
> > 
> > ___
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Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75

[Chris Ball]

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  
One Laptop Per Child
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Re: Sandisk extreme 32GB and 16GB dont initialize in XO-1.75

[George Hunt]

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  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  
> One Laptop Per Child
>
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