Raspberry Pi Compute Module

[Stephen Warren]

On 07/22/2015 10:58 AM, Stefan Wahren wrote:
> Hi Stephen,
> 
> Am 22.07.2015 um 05:41 schrieb Stephen Warren:
>> On 07/17/2015 11:08 AM, Stefan Wahren wrote:
>>> Hi all,
>>>
>>> is there anyone working on Mainline support for the Compute Module?
>>>
>>> I noticed the downstream kernel already has a bcm2708-rpi-cm.dtsi
>>
>> It is probably close enough that you can simply use bcm2835-rpi-b.dtb
>> for the CM too, for testing at least.
>>
>> I just tried this with latest U-Boot and a 4.2.0-rc3 kernel. The eMMC
>> works fine in U-Boot, but the kernel can't access it for some reason,
>> failing with e.g.:
>>
>> [    3.110503] Waiting for root device /dev/mmcblk0p2...
>> [    3.123895] mmc0: MAN_BKOPS_EN bit is not set
>> [    3.132264] mmc0: error -110 whilst initialising MMC card
>> [    3.788447] cfg80211: Calling CRDA to update world regulatory domain
>> [    4.204078] mmc0: MAN_BKOPS_EN bit is not set
>> [    4.212748] mmc0: error -110 whilst initialising MMC card
>> [    5.283981] mmc0: MAN_BKOPS_EN bit is not set
>> [    5.292657] mmc0: error -110 whilst initialising MMC card
>>
>> I had hoped that the kernel fixes for the VC MMU high address bits (via
>> the dma-ranges property in DT) would fix this, but I guess not since it
>> still doesn't work.
>>
> 
> thank your for testing.
> 
> Does defining the bus width as in bcm2708-rpi-cm.dtsi change anything?
> 
> &mmc {
>     status = "okay";
>     bus-width = <4>;
> };

Unfortunately not.