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)

done

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.

Thanks!

-m