Booting FIT kernels

[Rick Altherr]

Note that OpenBMC's Yocto builds put the .its used by the build system in
the deploy folder.

On Feb 13, 2017 7:06 PM, "Joel Stanley" <joel at jms.id.au> wrote:

> Hello,
>
> I've switched my kernel development workflow to use a FIT image
> containing the machine's dtb, initramfs and kenrel. By copying this
> over with tftp and booting it, I can test my changes with a real
> openbmc rootfs, but the changes go away once someone else reboots.
>
> This example uses witherspoon. Put the files in the root of your
> kernel object tree.
>
> 1. Download obmc-phosphor-initramfs-witherspoon.cpio.lzma[1]
> 2. Download http://ozlabs.org/~joel/openbmc.its
> 3. Build your kernel with `make`
> 4. Build your fit with `mkimgage -f openbmc.its myimage`
>
> You now have a FIT image called myimage. Copy it across to your tftp
> server and on a u-boot prompt as follows:
>
> ast > setenv serverip <tftp server>
> ast > tftp 0x83000000 myimage
> ast > bootm 0x83000000
>
> And off it goes! The magic was mostly working out where to find the
> .its file. In the future we could include this in the kernel tree and
> have a makefile rule that does the FIT-ing for us.
>
> Cheers,
>
> Joel
>
> [1] https://openpower.xyz/job/openbmc-build/distro=ubuntu,
> target=witherspoon/lastSuccessfulBuild/artifact/images/witherspoon/
>
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