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Re: kernel cross compile for RPi3 instructions

On Sat, Aug 26, 2017 at 11:35 PM, Roger Shimizu <rogershimizu@gmail.com> wrote:
On Sun, Aug 27, 2017 at 12:18 PM, Matt Zagrabelny <mzagrabe@d.umn.edu> wrote:
> Greetings,
> I have an RPi3 and have followed the instructions at [0] to install Stretch
> on the Pi.
> I am now hoping to cross compile and install the new kernel image (and
> modules). I have made some attempts at cross compiling the kernel and
> installing the image for u-boot.

For cross compile, I have an wiki entry you may be interested in:
- https://wiki.debian.org/HowToCrossBuildAnOfficialDebianKernelPackage

> It's currently not working and before I post details about my process and
> the console output I was wondering if anyone had a link to instructions for
> cross compiling a kernel and installing it to u-boot for an RPi3.

I don't have RasPi3, but for installation guide, I guess you can take
this as reference:
 - https://wiki.debian.org/RaspberryPi3

Thanks for the links. It does help.

I think my issue is related to generating the u-boot image.

Here is the console output when I try to boot my new image:


Net: Net Initialization Skipped
No ethernet found.
starting USB...
USB0: Core Release: 2.80a
scanning bus 0 for devices... 5 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
       scanning usb for ethernet devices... 1 Ethernet Device(s) found
Hit any key to stop autoboot:  0
swithc to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
reading /boot.scr
810 bytes read in 12 ms (65.4 KiB/s)
## Executing script at 02000000
Saving Environment to FAT...
writing uboot.env
FAT: Misaligned buffer address (000000003ab2aff0)
reading linux.uImage
5974654 bytes read in 392 ms (14.5 MiB/s)
reading bcm2837-rpi-3-b.dtb
12333 bytes read in 20 ms (601.6 KiB/s)
** No boot file defined **
## Booting kernel from Legacy Image at 01000000 ...
   Image Name:
   Image Type:   AArch64 Linux Kernel Image (gzip compressed)
   Data Size:    5974590 Bytes = 5.7 MiB
   Load Address: 00080000
   Entry POint:  00080000
   Verifying CHecksum ... OK
## Flattened Device Tree blob at 00000100
   Booting using the fdt blob at 0x000100
   Uncompressing Kernel Image ... OK
   reserving fdt memory region: addr=0 size=1000
   Loading Device Tree to 000000003ab27000, end 000000003ab2d02c ... OK

Starting kernel ...


and then it hangs forever.

I am hoping to find some instructions for generating the u-boot image for an RPi3 and check my workflow against that.



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