Am 21.11.2015 um 12:48 schrieb Stefan Bruens:
> On Saturday 21 November 2015 08:49:47 Matwey V. Kornilov wrote:
>>>> The flavor of dtb (dtb file) is to be specified in
>>>> /etc/sysconfig/bootloader>
>>> That shouldn't be necessary, U-Boot is supposed to provide $fdtfile.
>>> In my testing I didn't need to specify a dtb file in extlinux.conf, only
>>> the dtb directory.
>>
>> That is great news, but I think it is better to provide optional
>> possibility to set the file manually. Let me describe use-case.
>>
>> BeagleBone Black supports the capes, and the kernel still doesn't have
>> an user-space API for overlays. So, to enable my specific hardware I
>> will modify am335x-beaglebone.dts and compile new version, say
>> am335x-beaglebone-with-geiger-counter-cap.dtb. Sure, when I will deploy
>> this to my production, I will make a package
>> dtb-am335x-with-geiger-counter-%{version}.rpm (Please, see above,
>> imagine, new kernel update has been issued and my build service has not
>> rebuild this package yet, so I'll receive an updated kernel and will not
>> receive and updated dtb package)
>>
>> How should u-boot guess what I want now? So, please, let the user some
>> freedom.
>
> One possibility instead of choosing a different filename, use a different
> directory name, e.g.:
> /boot/dtb-4.3.0-geiger-cape/*dtb
> or
> /boot/dtb-4.3.0/geiger-cape/*dtb
That still leaves the question of how to get that directory into
extlinux.conf - it can no longer be inferred from the kernel then.
If the answer is hand-editing FDTDIR, then on the perl-bootloader side
we only need to assure that on add/remove operations it does not
override such local changes.
Do we have any actual example of such a cape dtb package that's not
self-made? I encountered and dropped some binary .dtb files in
raspberrypi-firmware package, other than that I am not aware of any.
And when self-made, doesn't that involve having a modified kernel-source
package?
Regards,
Andreas
--
SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton; HRB 21284 (AG Nürnberg)
--
To unsubscribe, e-mail: [email protected]
To contact the owner, e-mail: [email protected]
