OK, that is the latest one (if you can downloaded this week, it changed at the weekend).Thomas.Baur wrote:I use the rpiboot I get with:
$ git clone --depth=1 https://github.com/raspberrypi/usbboot
O.k. That's one of the first thing I thought about too. How do you attach the data cable before attaching the power cable? In that moment you plug in the USB cable, the board automatically gets power supply. I thought already about, that perhaps, the board comes into some "brown out" state.gregeric wrote:Hi Thomas.
While the host Pi/PC is "Waiting for BCM2835/6/7", ensure jumper is at the Slave Boot Enable position, attach the data cable, then lastly the power cable to the CMIO board. It will take about 5 seconds for the VPU to timeout on booting from eMMC, then it will try USB. At that point you should get the idProduct=2763, prior to bootcode.bin being squirted over to the L1 cache.
I'm not a specialist in relation to VPU. But my suspicion is, that it first checks if there is >any< code what can be executed and then gives the control to the cpu unit. I'm not shure, but perhaps disabling the EMM on CB3 >could< result in reading zero to 0xffffffff what drives the VPU to the misunderstanding, that there is any bootable code. I said COULD, I'm not shure. This would have the consequence, that the VPU doesn't feel responsible for init usb unit register and the cpu cannot. Please keep in mind, that I'm talking about CB3 not CB1.gregeric wrote: Note that up till now, no ARM cores are turned on, it's all running off the SoC's VPU. It remains that way for the rest of the process: the whole mass storage device application is running on the VPU under ThreadX OS (or VPU bare metal maybe). It is completely agnostic about what data is on the eMMC - the corrupt root partition is all ARM code, which it cannot execute.
Check the schematic of the CMIOv3 boardThomas.Baur wrote:How do you attach the data cable before attaching the power cable? In that moment you plug in the USB cable, the board automatically gets power supply.
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