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| /rk3399_ARM-atf/plat/intel/soc/common/ |
| H A D | socfpga_psci.c | 7f7a16a6c0a49af593fa080eb66f72a20bb07299 Thu Mar 02 05:38:53 UTC 2023 Jit Loon Lim <jit.loon.lim@intel.com> fix(intel): update boot scratch to indicate to Uboot is PSCI ON
There is a use case where kernel requested ATF to power off/on only CPU0.
However, after ATF power off/on CPU0, CPU0 did not back into the state
to wait for ATF. Instead, CPU0 continue to reentry SPL boot sequence
because CPU0 is master/primary core. This causing the system reboot from
SPL again, while the slave core still in kernel.
To resolve this, ATF is set the boot scratch register 8 bit 17 whenever
it is a request from kernel to power off/on only CPU0. So, if this boot
scratch bit is set, CPU 0 will be able to put into a state to wait for
ATF.
Signed-off-by: Jit Loon Lim <jit.loon.lim@intel.com>
Change-Id: Ia0228c5396beaa479858f5bd02fc05139efd2423
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