Am 19.11.2014 um 18:43 schrieb Stephen Warren:
On 11/18/2014 09:40 PM, Stephen Warren wrote:
Detect the board revision early during boot, and print the decoded model name.
Eventually, this information can be used for tasks such as:
- Allowing/preventing USB device mode; some models have a USB device on- board so only host mode makes sense. Others connect the SoC directly to the USB connector, so device-mode might make sense.
- The on-board USB hub/Ethernet requires different GPIOs to enable it, although luckily the default appears to be fine so far.
- The compute module contains an on-board eMMC device, so we could store the environment there. Other models use an SD card and so don't
support saving the environment (unless we store it in a file on the FAT boot partition...)
Set $fdtfile based on this information. At present, the mainline Linux kernel doesn't contain a separate DTB for most models, but I hope that will change soon.
BTW, I should have mentioned that I'm hoping the kernel people CC'd here will take a look at the DTB filenames this patch assumes, and comment on whether they seem reasonable. If so, we can formulate a patch for the kernel to actually create all those DTs in the nearish future.
The DTB filenames look good for me.