Raspberry Pi Compute Module

[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.