On Fri, Jun 30, 2017 at 11:04 PM, Sergey Manucharian <s...@ara-ler.com> wrote: > Oh, thanks, William, I was inspired doing this by your post! > > The problem is that "usb start" starts u-boot's USB subsystem, it (probably) > has nothing to do with the CPU. > You explicitly mentioned that used a USB HDD with external power supply, but > I'm trying to boot off a USB flash drive. The CPU doesn't provide USB power > at early stage. If I provide power from an external source, everything works > fine. > > The latest u-boot supports loading overlays, I'm not sure whether it's > possible to load an overlays with the correct configuration of that pin and > then load kernel and stuff from USB flash drive.
Why not? zImage: "loadimage=load ${devtype} ${bootpart} ${loadaddr} ${bootdir}/${bootfile}\0" \ https://github.com/eewiki/u-boot-patches/blob/master/v2017.07-rc2/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L507 overlay: "load ${devtype} ${bootpart} ${rdaddr} ${uboot_overlay}; " \ https://github.com/eewiki/u-boot-patches/blob/master/v2017.07-rc2/0002-U-Boot-BeagleBone-Cape-Manager.patch#L800 both use the devtype & bootpart references.. Thus if the kernel/dtb are on the same partition of the usb flash drive as the overlays, everything just works.. But, you'll need to add the usb options here: https://github.com/eewiki/u-boot-patches/blob/master/v2017.07-rc2/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L277 Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYj57u-peKX_BgFJJYTzhbVgRkWDbZ7TU4Dw39UoMOxFsQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.