25 січня 2024 р. 08:29:54 GMT+02:00, Dan Carpenter dan.carpenter@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.
Currently if no fdt is specified u-boot will pass its own device tree and if leave fdt field blank u-boot will fail with the wrong name for the device tree. So there is NO way to boot ATAGs based kernel if u-boot has an appended tree and fdt support built in.
regards, dan carpenter