More RPI-B/SD card information [was: Re: RPi won't boot 10.2-BETA1 -- SOLVED]

[Glen Barber]

On Wed, Jul 15, 2015 at 08:54:03AM -0700, Carl Johnson wrote:
> Glen Barber <gjb at FreeBSD.org> writes:
> 
> > On Tue, Jul 14, 2015 at 08:54:06PM -0700, Carl Johnson wrote:
> >> I bought a new microSDHC card and that card works.  The new one is a
> >> 16GB SanDisk Ultra PLUS UHS-1 card in case anybody is keeping track.  I
> >> had tried two different Class 4 cards that didn't work, so maybe the
> >> faster speed is necessary now, or maybe it is picky about brands.
> >> 
> >
> > FWIW, I have a few class-10 cards that will absolutely not work, and
> > a few class-4 cards that work perfectly fine.
> >
> > After getting my test setup working properly (cards that work, etc.),
> > I looked into it a bit further, and it *seems* that all of my cards
> > (except one class-10 card) out of about 12 different SD cards work fine
> > with "normal data."
> >
> > Just an additional data point, although I realize it contradicts your
> > findings.
> 
> Thanks, that is useful to know.  The first class-4 card worked with a
> January 10.1-STABLE snapshot, but didn't work with June 10.1-STABLE or
> 11.0-CURRENT snapshots or the 10.2-BETA1 release.
> 

I did a bit more testing, and it seems the RPI-B is *very* picky about
what SD cards will work.  Below follows results of the tests, using the
20150716-r285616 RPI-B image (built last night, propagating now).

For completeness, I've included 'mmcinfo' output from u-boot, but what
is really interesting is cards (7) and (8).  To make sure the test was
run with a working card, I tested the BeagleBone Black image on card (7)
which booted fine.

 1) FAILED
 PNY class 4 SDHC 8GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 2
 OEM: 544d
 Name: SA08G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 7.2 GiB
 Bus Width: 4-bit
 
 2) SUCCESS
 Sandisk (Ultra) class 10 SDHC (I) 8GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 3
 OEM: 5344
 Name: SL08G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 7.4 GiB
 Bus Width: 4-bit
 
 3) FAILED
 Kingston class 4 SDHC 8GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 2
 OEM: 544d
 Name: SD08G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 7.4 GiB
 Bus Width: 4-bit
 
 4) FAILED
 Kingston class 4 SDHC 8GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 2
 OEM: 544d
 Name: SA08G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 7.2 GiB
 Bus Width: 4-bit
 
 5) SUCCESS
 Samsung (class unknown) SD 2GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 1b
 OEM: 534d
 Name: 00000 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: No
 Capacity: 1.9 GiB
 Bus Width: 4-bit
 
 6) SUCCESS
 Sandisk class 4 SDHC (I) 8GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 3
 OEM: 5344
 Name: SS08G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 7.4 GiB
 Bus Width: 4-bit
 
 7) FAILED
 Kingston class 4 SDHC 4GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 2
 OEM: 544d
 Name: SA04G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 3.6 GiB
 Bus Width: 4-bit

 8) SUCCESS
 Kingston class 4 SDHC 4GB
 U-Boot> mmcinfo
 Device: bcm2835_sdhci
 Manufacturer ID: 2
 OEM: 544d
 Name: SA04G 
 Tran Speed: 50000000
 Rd Block Len: 512
 SD version 2.0
 High Capacity: Yes
 Capacity: 3.6 GiB
 Bus Width: 4-bit

Glen

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