[PATCH U-Boot] ARM: rpi_b: detect board revision
swarren at wwwdotorg.org
Wed Nov 19 09:43:56 PST 2014
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
> 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.
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