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.carpen...@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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