lb wrote:lingon, what kernel and firmware version are you using for the UHS-1 card? How does booting fail (at what stage, and if applicable, what kinds of errors)?
If you used the Wheezy image as-is, a manual update of kernel and firmware might help.
Today I upgraded to the Debian Wheezy Beta
Linux raspberrypi 3.1.9+ #125 PREEMPT Sun Jun 17 16:09:36 BST 2012 armv6l GNU/Linux
This image works fine on the Transcend 8 GB card, but the SanDisk Extreme Pro 16 GB UHS-1 SDSDXP1-016G-X46 card still fails to boot from the very same image. With this new image the OK light turns green when trying to boot from the UHS-1 card. This is some progress compared to the previous Wheezy Alpha version.
My card lacks a Class 10 marking as in this picture
http://veikals.bfs.lv/images/thumbs/def ... 6g-x46.jpg
The similar SanDisk Extreme 16 GB UHS-1 card does have a Class 10 marking in addition to the UHS-1 marking.
http://www.memorycow.co.uk/image/cache/ ... 50x250.jpg
I don't know if the lack of a Class 10 marking is a problem or not. My UHS-1 card works fine with my SD-card reader though.
I used Hexxehs tool to update the kernel and firmware on the Debian Wheezy Beta image.
I was pleased to find out that now my SanDisk Extreme 16 GB UHS-1 card boots fine with this kernel:
Linux raspberrypi 3.1.9+ #135 PREEMPT Fri Jun 22 20:39:30 BST 2012 armv6l GNU/Linux
Thanks for the nice work with the boot firmware!
The following messages are seen at boot time:
dmesg | grep mmc0
[ 5.905733] Registered led device: mmc0::
[ 5.906173] mmc0: SDHCI controller on BCM2708_Arasan [platform] using platform's DMA
[ 5.921959] mmc0: BCM2708 SDHC host at 0x20300000 DMA 2 IRQ 77
[ 6.094250] mmc0: problem reading SD Status register.
[ 6.145648] mmc0: new high speed SDHC card at address e624
[ 6.165684] mmcblk0: mmc0:e624 SD16G 14.8 GiB
[ 17.407499] mmc0: missed completion of cmd 17 DMA (512/512 /) - ignoring it
[ 17.424891] mmc0: DMA IRQ 6 ignored - results were reset
The speed is the following:
sudo hdparm -Tt /dev/mmcblk0p1
Timing cached reads: 300 MB in 2.01 seconds = 149.53 MB/sec
Timing buffered disk reads: 50 MB in 3.11 seconds = 16.06 MB/sec