beaglebone boot from eMMC

[Warner Losh]

> On Mar 12, 2015, at 10:27 PM, Bernd Walter <ticso at cicely7.cicely.de> wrote:
> 
> On Wed, Mar 11, 2015 at 11:38:39AM +0100, Hellmuth Michaelis wrote:
>> Further investigation shows, if i dd the local image from /dev/mmcsd0 or a fresh image from remote to /dev/mmcsd1 i get sooner or later
>> 
>> GEOM_PART: integrity check failed (mmcsd1, MBR)
>> GEOM_PART: integrity check failed (diskid/DISK-5F817AAF, MBR)
>> 
>> on the serial console. Is the internal SD broken ?
>> 
>> I got similar messages when i used the copy script and during probing while start of the kernel.
> 
> I remember having seen similar problems when I tried using the eMMC last
> year.
> I also used crochet and the copy script, but IIRC ended when it didn't boot.
> Details should be on this list somewhere.

Last time I looked into issues like this it was due to gpart putting too much stock
in the BIOS returned geometry. usb devices rarely match each-other, let alone
the fake geometry we return from mmcsd. I suspect the root of these weird to
diagnose issues lies here.

Warner

>>> Am 11.03.2015 um 08:31 schrieb Emmanuel Vadot <elbarto at bocal.org>:
>>> 
>>> If you have all  C it means that the SoC can't find the MLO or that the MLO can't find u-boot.img I don't remember which one.
>>> 
>>> --
>>> Emmanuel Vadot
>>> 
>>>> On 11 Mar 2015, at 08:27, Hellmuth Michaelis <hm at hellmuth-michaelis.de> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> i???m running a recent current on a beaglebone black and i???m using crochet to build stuff. I???ve seen the copy to eMMC script in root and tried that. After running it, i checked the MSDOS and UFS partitions and it seems they are OK. But, after removing the SD card and trying to boot from the internal eMMC i just see ???C??????s coming out slowly of the serial console, nothing else is happening. Putting in the SD card and all runs well again.
>>>> 
>>>> Has someone a hint what to look for to get it working ?
> 
> --
> B.Walter <bernd at bwct.de> http://www.bwct.de
> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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