On Wed, Jul 07, 2021 at 12:58:55PM +0200, Stephan Gerhold wrote: > The U-Boot "stemmy" board is mainly intended to simplify booting > mainline Linux on various smartphones from Samsung based on ST-Ericsson > Ux500. While the mainline kernel is working great, there are still some > features missing there. In particular, it is currently not possible to > charge the battery when using the mainline kernel. > > This means that it is still necessary to boot the downstream/vendor > kernel from Samsung sometimes to charge the device. That kernel is > ancient, still uses board files + ATAGS instead of device trees and > relies on a strange very long kernel command line hardcoded in the > Samsung bootloader. > > Actually, since mainline is booted with device trees there is a very > simple way to make the old downstream kernel work as well: We can > simply take most of the ATAGS passed to U-Boot from the Samsung > bootloader and copy them as-is when booting a kernel without device > tree. That way the long command line and other needed ATAGS are copied > as-is without having to bother with them. > > The only exception is the ATAG_INITRD - since the initrd is loaded > by U-Boot, the atag for that should be generated in U-Boot so it points > to the correct address. All other ATAGS are copied as-is and not > generated in U-Boot. > > Also use the chance and provide a serial# for U-Boot by parsing the > ATAG_SERIAL that is also passed by the Samsung bootloader. > > Signed-off-by: Stephan Gerhold <step...@gerhold.net> > Reviewed-by: Linus Walleij <linus.wall...@linaro.org>
Applied to u-boot/master, thanks! -- Tom
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