Re: flash-kernel and dtb

[Karsten Merker <merker@debian.org>]

On Sat, Jun 14, 2014 at 10:36:43PM +0200, Rainer Dorsch wrote:

> I try to get the kernel up with manual tweaks in u-boot first:
> 
> CPU:   Freescale i.MX6Q rev1.2 at 792 MHz
> Reset cause: POR
> Board: MX6-CuBox-i
> DRAM:  2 GiB
> MMC:   FSL_SDHC: 0
> In:    serial
> Out:   vga
> Err:   vga
> Net:   FEC
> (Re)start USB...
> USB0:   lowlevel init failed
> USB1:   USB EHCI 1.00
> scanning bus 1 for devices... 1 USB Device(s) found
>        scanning usb for storage devices... 0 Storage Device(s) found
>        scanning usb for ethernet devices... 0 Ethernet Device(s) found
> Hit any key to stop autoboot:  0 
> CuBox-i U-Boot >  setenv mmcdev 0
> CuBox-i U-Boot > setenv mmcpart 2
> CuBox-i U-Boot > setenv ramdiskaddr 0x11800000
> CuBox-i U-Boot > setenv fdt_addr 0x18000000
> CuBox-i U-Boot > setenv scr_addr 0x19900000
> CuBox-i U-Boot > ext4load mmc 0:2 0x19900000 /boot/boot.scr
> 637 bytes read in 94 ms (5.9 KiB/s)
> CuBox-i U-Boot > source 0x19900000
> ## Executing script at 19900000
> 2857680 bytes read in 248 ms (11 MiB/s)
> 28603 bytes read in 126 ms (221.7 KiB/s)
> 10934444 bytes read in 620 ms (16.8 MiB/s)
> Booting Debian 3.15-rc8-armmp from mmc 0:2...
> Kernel image @ 0x10800000 [ 0x000000 - 0x2b9ad0 ]
> ## Flattened Device Tree blob at 18000000
>    Booting using the fdt blob at 0x18000000
> EHCI failed to shut down host controller.
>    Loading Ramdisk to 8ecf1000, end 8f75e8ac ... OK
>    Using Device Tree in place at 18000000, end 18009fba
> 
> Starting kernel ...
>
> but then the boot process is stuck.

It looks like you might not have set a console device, so
possibly the kernel boots, but you do not see any output.  Try
setting the console device on the kernel commandline with a
command like:

  setenv bootargs 'console=ttyS0,115200 rootwait panic=10'

(The example assumes that the serial port on the i.MX6 is ttyS0 and 
not something else such as ttyAMA0.)

HTH,
Karsten
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