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authorStephen Warren <swarren@wwwdotorg.org>2014-11-18 21:40:21 -0700
committerTom Rini <trini@ti.com>2014-12-08 09:35:42 -0500
commit6fe7845a9823c12aa673ad3590059528c184b987 (patch)
tree0a7ae3d163810facecf4576530befac2f05b903d /board/ppmc7xx
parent4c5bbc2328a24f5e1ee990c9a9527e48e5fb3b5f (diff)
ARM: rpi_b: detect board revision
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. Signed-off-by: Stephen Warren <swarren@wwwdotorg.org> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
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