On 09/28/2016 01:02 PM, rom...@gmx.de wrote:
I noticed something strange in the boot messages:
When bootings with u-boot i can see-> Machine model: Raspberry Pi 3 Model B
Without u-boot it is-> Machine model: Raspberry Pi 3 Model B Rev 1.2
Why is there a difference when Im using the same device-tree? Could this
be the reason why spi and i2c is disabled?
quote from:
https://www.raspberrypi.org/documentation/configuration/device-tree.md
> The current implementation is not a pure Device Tree system - there
> is still board support code that creates some platform devices - but
> the external interfaces (I2C, I2S, SPI), and the audio devices that
> use them, must now be instantiated using a Device Tree Blob (DTB)
> passed to the kernel by the loader (start.elf).
From what I recall:
start.elf contains a default device tree blob. (dt-blob.bin)
Only a dt-blob.bin file will overwrite the device tree in second stage
boot loader(start.elf)
--
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