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. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
