[yocto] FW: Problem to generate u-boot image

[Darren Hart]

On 05/31/2011 01:44 AM, Paul Eggleton wrote:
> On Friday 27 May 2011 09:17:45 Nikhil Kamath wrote:
>> $ bitbake u-boot_git
> 
> When specifying a target for bitbake you can't include the version (the 
> underscore _ and everything after it). Poky will take care of selecting the 
> version for you; in this case there is only one. So you should run the 
> following instead:
> 
> $ bitbake u-boot
> 
> FYI for future reference if you do have multiple version choices and want to 
> force one of them to be selected that is not the default, you need to add this 
> somewhere (initially local.conf, but it may become part of your custom distro 
> if you later create one):
> 
> PREFERRED_VERSION_packagename = "1.0"
> 
> (Assuming packagename is the name of the package and 1.0 is the version you 
> want to select.)
> 
> Cheers,
> Paul
> 

Paul is correct in all the above. However, u-boot is very
machine-specific, and there is no qemuarm u-boot configuration. In order
to build u-boot, you must define:

UBOOT_MACHINE
UBOOT_ENTRYPOINT
UBOOT_LOADADDRESS

In bernard and older releases, the first is usally defined in the
u-boot_git.bb as a machine override:

UBOOT_MACHINE_your-machine = "uboot-machine-config"

Where uboot-machine-config is a named machine config that upstream
u-boot ships with its sources. The second and third variable are usually
defined in the machine configuration file.

For example, for the beagleboard, these values are set as:

UBOOT_MACHINE = "omap3_beagle_config"
UBOOT_ENTRYPOINT = "0x80008000"
UBOOT_LOADADDRESS = "0x80008000"

If you aren't sure what those values should be, consider starting a
thread on the u-boot mailing list on how to configure u-boot for your
specific machine.

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel