TH1520（C910）boot information: CPU1、CPU2、CPU3: failed to come online ; only CPU0 succeed to come online about opensbi

[RevySR]

armbian kernel config is wrong.

The commit remove fdt_reset_thead
d1e0f7f

https://github.com/T-head-Semi/zero_stage_boot

[RevySR]

@RevySR Do you know how to make use of the changes in zero_stage_boot? I'm not sure about the steps to deploy it onto a board.

I don't know. Ren Guo knows how to do it

[pdp7]

@RevySR Do you know how to make use of the changes in zero_stage_boot? I'm not sure about the steps to deploy it onto a board.

[SiFiveHolland]

The problem is that upstream OpenSBI is missing a HSM driver for this SoC. With or without zero_stage_boot, a proper HSM driver is still needed for CPU power management (hotplug, cpuidle). And once OpenSBI has a real HSM driver, you don't need any assistance from zero_stage_boot for SMP bringup.

[guoren83]

The problem is that upstream OpenSBI is missing a HSM driver for this SoC. With or without zero_stage_boot, a proper HSM driver is still needed for CPU power management (hotplug, cpuidle). And once OpenSBI has a real HSM driver, you don't need any assistance from zero_stage_boot for SMP bringup.

Yes, the th1520 needs an SoC platform HSM driver. The zero_stage_boot is just for the CPU FPGA prototype to replace the reset_sample.

[guoren83]

@RevySR Do you know how to make use of the changes in zero_stage_boot? I'm not sure about the steps to deploy it onto a board.

I don't know. Ren Guo knows how to do it

Before zero_stage_boot gets into the first-stage bootloader, you could revert the removing reset-sample patch first.

[ixgbe01]

armbian kernel config is wrong.

The commit remove fdt_reset_thead d1e0f7f

https://github.com/T-head-Semi/zero_stage_boot

With the help of your advice, CPU1, CPU2, and CPU3 could succeed to come online normally. Thank you so much!