On 17/03/15 17:29, Stephen Warren wrote:
Do the RPi 1 and RPi 2 use different kernel binaries in the RPi Foundation's 
images? I'd assumed there was a single unified binary which supported both. The 
reason I ask is that I see:

We ship separate kernel binaries (kernel.img for 2835 and kernel7.img for 2836).
kernel.img is built from bcmrpi_defconfig, and kernel7.img is built from 
bcm2709_defconfig

A single unified binary would sure be nice, but I think we have too many 
non-device-tree drivers in our kernel and not enough experience to make this 
happen easily.
It's certainly a desirable goal (as it moving closer to the upstream mach-2835 
kernel).

I assume the SDHCI controller (RPi SD card, CM eMMC) is affected by this just 
as much; we need to use bus addresses not ARM physical addresses when 
programming any DMA there?

Yes. Any address given to the DMA controller should be a bus address.
Similarly any address exchanged with the GPU (e.g. framebuffer address from 
mailbox interface) should be a bus address.

Perhaps this would explain why I had issues with the eMMC on the CM (I think 
only in the kernel though, whereas U-Boot may have been fine; I'll have to 
check)

Using physical addresses when bus addresses are required can almost work, but 
with intermittent failure cases, so yes that sounds possible.

I assume 128M and 512M there should be 128K and 512K?

Yes, quite right.
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