Need help compiling rpi kernel

Question

Need help compiling rpi kernel

cedricp opened this issue 8 years ago · 14 comments

Hi,
I successfully built all packages for a bcm2708 platform, the binaries are working fine, but I have no luck to build a working Kernel...
If I use a pre-built one, the rpi boots up normally, but with the Openbrick's one, nop. I use the internal GCC toolchain, tested with version 3.18.16 and 4.1.20...
The generated zImage doesn't work with qemu, too. Is there something I'm missing ?
Regards.

cedricp commented 8 years ago

Thanks :)

Answer 1 · 2017-02-08T12:41:41.000Z

The Raspberries don't use zImage directly. The build script (see https://github.com/OpenBricks/openbricks/blob/master/packages/system/linux/build#L64 ) post-processes them to form kernel.img and kernel7.img, respectively. The script used for this can be found in ./config/platforms/arm/bcm270x/packages/linux/sources/ . The resulting boot files will be placed in <kernel_build_dir>/.install/boot and this is what you should be using.

Answer 2 · 2017-02-08T12:47:23.000Z

Thank you for that information, but I used the zImage for QEMU only. I do use the <kernel_build_dir>/.install/boot folder to boot the real RPI, but unsuccessfully, it remains stuck after one green led flash.

Answer 3 · 2017-02-08T12:48:26.000Z

Have you ever tested to compile the Kernel with the internal GCC toolchain ? ( I use the latest GIT devel branch with GCC4.9)

Answer 4 · 2017-02-08T12:51:48.000Z

By the way, is there a mailing list for Openbricks ? Would like to contribute as far I as can.

Answer 5 · 2017-02-08T13:55:27.000Z

3.18.16 is working on the PI, finally :) But still struggling to get a valid QEMU kernel file...

Answer 6 · 2017-02-08T14:58:26.000Z

Le 08/02/2017 à 13:51, CED a écrit : Hello,

By the way, is there a mailing list for Openbricks ? Would like to contribute as far I as can.

yes there is : https://groups.google.com/forum/#!forum/geexbox-devel

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Answer 7 · 2017-02-08T18:22:31.000Z

Have you ever tested to compile the Kernel with the internal GCC toolchain ? ( I use the latest GIT devel branch with GCC4.9)

I just recompiled 4.1.20 (have not tried 3.18 for many moons) and put it on an SD card using our script. It booted right away without any problems.

Did copy config.txt, all the *.dtb files and overlays? Do your 'firmware-arm-raspberrypi' and 'raspberrypi-userland' packages match the kernel version? If you are not sure, clean them out and rebuild them.

Answer 8 · 2017-02-09T08:33:12.000Z

Recompiled with 4.1.20, working now... But still looking for a way to build qemu kernel. Seems that I just have to get the generated zImage and give it to QEmu, but I remains stuck at startup... I found that : https://github.com/dhruvvyas90/qemu-rpi-kernel/tree/master/tools
Perhaps I must turn on/off a specific parameter of the Kernel, but I don't know which one !

Answer 9 · 2017-02-10T13:47:42.000Z

Unfortunately I have no idea either. Never tried QEMU...

Answer 10 · 2017-03-19T12:42:20.000Z

I have updated the RPi kernel to 4.9.15. It now uses pretty much the default config. Maybe it's worth another try. Be sure to update firmware and userland as well...

Answer 11 · 2017-05-17T17:36:58.000Z

Can we close this ?

Answer 12 · 2017-05-17T17:49:32.000Z

Of course !

Answer 13 · 2017-05-17T18:34:30.000Z

Thanks
Feel free to open a new issue if needed