[meta-xilinx] How to make uImage for zynqmp

[Cai, Chuntian (GE Transportation)]

Hi Nathan

I am not aware of that uImage is obsoleted for arm64, could you tell me how to use booti command to boot linux?

What address and how to set dtb and rootfs?

Thanks.



-----Original Message-----
From: Nathan Rossi [mailto:nathan at nathanrossi.com] 
Sent: Monday, October 10, 2016 5:31 PM
To: Cai, Chuntian (GE Transportation)
Cc: meta-xilinx at yoctoproject.org; Mike Looijmans
Subject: EXT: Re: [meta-xilinx] How to make uImage for zynqmp

On Mon, Oct 10, 2016 at 3:46 PM, Mike Looijmans <mike.looijmans at topic.nl> wrote:
> On 09-10-16 03:20, Cai, Chuntian (GE Transportation) wrote:
>
>> I using bitbake build Linux system for zcu102 board.
>>
>> I issue bitbake core-image-x11 , then I can found Image file in the 
>> deploy folder, But I could not find uImage, and I want use uImage

uImage is not a valid target for aarch64/arm64 in the kernel (like it is for arm). This is because "uImage" is actually shorthand for u-boot wrapped zImage. And arm64 does not have support for zImage, thus also does not have a uImage target.

(arm targets) https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/Makefile?id=refs/tags/v4.8#n365
(arm64 targets)
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/Makefile?id=refs/tags/v4.8#n135

---

A good question is why do you want to use uImage? If you are not aware it is possible to boot a linux "Image" with the U-Boot "booti"
command.

However it is possible to wrap the kernel image with mkimage (or a FIT blob if you are prepared to configure the image tree). For wrapping with mkimage the command you will need is similar to:

mkimage -A arm64 -O linux -T kernel -C none -a 0x80000 -e 0x80000 -d Image Image.ub

Also if you need mkimage, run the command using the mkimage built by OE from the sysroot relative to the tmp/deploy/images/<machine>/ directory of your build (assuming you are on a x86_64 host):

../../../sysroots/x86_64-linux/usr/bin/mkimage ...

>>
>>
>> Could you tell me how to build uImage rather than Image
>
>
> Just setting KERNEL_IMAGETYPE="uImage" in the kernel recipe or machine 
> config would do that.
>
> I think you can even specify multiple types in there.

You can, KERNEL_IMAGETYPES += "<extra ones>"

Regards,
Nathan

>
>
>
> Kind regards,
>
> Mike Looijmans
> System Expert
>
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