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m1n1: Resident EL3 PSCI for A7-A9, on by default #102

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m1n1: Resident EL3 PSCI for A7-A9, on by default #102

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6c1601e
Optional resident m1n1 EL3 PSCI
brkosebay Nov 8, 2026
6525d20
Merge main into j71t/psci
brkosebay Nov 12, 2026
7d41c32
m1n1: Resident EL3 PSCI for A7-A9, on by default
brkosebay Nov 12, 2026
8c737f8
Merge upstream main into j71t/psci
brkosebay Nov 13, 2026
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13 changes: 13 additions & 0 deletions boot/m1n1/README.md
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Expand Up @@ -28,3 +28,16 @@ gives the same tree as Hoolock's tip before updating `sources.toml`.

Scratch stays in ignored `boot/m1n1/.work/<device>/`. `--resume` reuses it only
if the recorded patch set is unchanged.

## Resident PSCI on A7-A9

Orchard patch 0015 adds the resident EL3 PSCI monitor (CPU_ON, CPU_OFF,
AFFINITY_INFO); 0016-0019 make it the default whenever m1n1 is entered at EL3
and add SYSTEM_RESET (warm reboot back into m1n1, which boots the default BLS
entry with the last launch's DTB) and SYSTEM_OFF (halt). Any PSCI-aware
kernel reboots, powers off and kexecs through its ordinary paths; m1n1 takes
IPI-stopped CPUs back by trapping EL1 WFI/WFE to EL3. EL1/EL2 entries keep
the spin table. Payload variables (append to `m1n1.bin`, e.g. with
`psci-loader`): `psci=0` turns PSCI off, `psci_reset=0` keeps only the CPU
lifecycle (no WFI/WFE traps), `psci_reset=proxy` stops in the proxy after a
reset. 0020 marks retained hardware in the device tree after a re-entry.
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