4ce5f7ebe1
This patch fixes hangup of RISC-V multicore boot.
Currently boot sequence uses a riscv_cpu_wake_flag to notify wakeup
request for secondary core(s).
But initial value of riscv_cpu_wake_flag is undefined, so current
mechanism is going to hangup if riscv_cpu_wake_flag and mhartid of
secondary core have the same value.
This is an example situation of this problem:
- hart1: check riscv_cpu_wake_flag (value is 1) and end the loop
- hart1: set riscv_cpu_wake_flag to 0
- hart0: set riscv_cpu_wake_flag to 1
hart0 expects it will be changed to 0 by hart1 but it
has never happened
Note:
- hart0's mhartid is 0, hart1's mhartid is 1
- hart0 is main, hart1 is secondary in this example
Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
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| .. | ||
| core | ||
| include | ||
| CMakeLists.txt | ||
| Kconfig | ||
| Kconfig.core | ||
| Kconfig.isa | ||