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Odd messages booting Cubox-i4 Pro "imx-gpc 20dc000.gpc: failed to get pu regulator: -517" and "ERROR: could not get clock /usdhc1_pwrseq:ext_clock(0)"



Does anyone know what the error messages 

Does anybody know what is causing the subject error messages?

It almost looks like the DTB is claiming a couple of devices that don't exist on this hardware... But I don't understand enough of that process to be sure.

Anybody got some clues?

I've attached the first several lines of the boot log, up-to and including the error messages, in hopes that they may have some information about the hardware.

Thanks!
Rick

> U-Boot 2015.10+dfsg1-3 (Nov 24 2015 - 22:14:29 +0000)
> 
> CPU:   Freescale i.MX6Q rev1.5 996 MHz (running at 792 MHz)
> CPU:   Extended Commercial temperature grade (-20C to 105C) at 29C
> Reset cause: WDOG
> Board: MX6 Cubox-i
> DRAM:  2 GiB
> MMC:   FSL_SDHC: 0
> No panel detected: default to HDMI
> Display: HDMI (1024x768)
> In:    serial
> Out:   serial
> Err:   serial
> Net:   FEC
> Hit any key to stop autoboot:  0 
> switch to partitions #0, OK
> mmc0 is current device
> Scanning mmc 0:1...
> Found U-Boot script /boot.scr
> 1474 bytes read in 32 ms (44.9 KiB/s)
> ## Executing script at 12000000
> 3415976 bytes read in 371 ms (8.8 MiB/s)
> 33984 bytes read in 98 ms (337.9 KiB/s)
> 17496691 bytes read in 1231 ms (13.6 MiB/s)
> Booting Debian 4.3.0-1-armmp from mmc 0:1...
> Kernel image @ 0x12000000 [ 0x000000 - 0x341fa8 ]
> ## Flattened Device Tree blob at 18000000
>    Booting using the fdt blob at 0x18000000
>    Using Device Tree in place at 18000000, end 1800b4bf
> 
> Starting kernel ...
> 
> [    0.098389] imx-gpc 20dc000.gpc: failed to get pu regulator: -517
> 
> [    1.485042] imx-sdma 20ec000.sdma: firmware: failed to load imx/sdma/sdma-imx6q.bin (-2)
> [    1.544474] imx-gpc 20dc000.gpc: failed to get pu regulator: -517
> [    1.551844] imx-gpc 20dc000.gpc: failed to get pu regulator: -517
> Loading, please wait...
> [    2.221380] imx-gpc 20dc000.gpc: failed to get pu regulator: -517
> [    2.257486] ERROR: could not get clock /usdhc1_pwrseq:ext_clock(0)
> 


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