On Sun, Jan 12, 2025 at 11:36:57PM +0100, Marek Vasut wrote: > Add empty weak assembler function armv8_switch_to_el2_prep() which is > jumped to just before U-Boot determines which EL it is running in and > decides which path to take to boot the Linux kernel. > > This weak function is meant to be used by architecture specific code > to implement jump to a firmware blob, which then returns right past > this weak function and continues execution of U-Boot code which then > boots the Linux kernel. One example of such use case is when U-Boot > jump tp TFA BL31, which switches from EL3 to EL2 and then returns to > U-Boot code newly running in EL2 and starts the Linux kernel. > > The weak function is called with caches already disabled and DM shut > down. Any preparatory work or even loading of more data must be done > in board_prep_linux(), this hook is meant only for the final jump to > the firmware and return to U-Boot before booting Linux. > > Signed-off-by: Marek Vasut <[email protected]>
Reviewed-by: Tom Rini <[email protected]> -- Tom
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