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: [157819.866661] 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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