[PATCH v1 0/1] Fix booting kernels with ATAGS and extlinux

[Tom Rini]

On Thu, Jan 25, 2024 at 08:51:09AM +0200, Svyatoslav wrote:
> 
> 
> 25 січня 2024 р. 08:29:54 GMT+02:00, Dan Carpenter <dan.carpenter at linaro.org> написав(-ла):
> >On Wed, Jan 24, 2024 at 10:27:30PM +0200, Svyatoslav Ryhel wrote:
> >> Currently, if boot with extlinux.conf and do not set the fdt
> >> U-Boot will provide its own device tree. This behavior is
> >> beneficial if the U-Boot device tree is in sync with Linux,
> >> but it totally halts the booting of pre-dtb kernels (3.4 for
> >> example) since it uses ATAGs. To fix this, pass `-` in the
> >> fdt extlinux field as a signal that no tree should be used.
> >
> >Passing - doesn't seem like the most intuitive thing...  Is there a
> >different argument we could use?
> >
> 
> I agree that `-` is not the most intuitive argument,
> but this is a way to implement a fix with the least
> code posssible. To make this less obscure I have
> adjusted documentation. 

It's also how historically we do similar things. eg, "bootm
$kernel_addr_r - $fdt_addr_r". My question is can we re-work this,
cleanly, with guards around SUPPORT_PASSING_ATAGS to not increase size
anywhere that doesn't need this legacy case.

-- 
Tom
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