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kernel/configs/apple-16k/config: CONFIG_DRM_APPLE_G5P=y These options provide g5p and its Kconfig dependencies on both page sizes. Assisted-by: LLM
kernel/configs/apple-16k/config: CONFIG_APPLE_AOP_GYRO=m CONFIG_APPLE_AOP_PRESSURE=m These options provide aop and its Kconfig dependencies on both page sizes. Assisted-by: LLM
kernel/configs/apple-16k/config: # CONFIG_NVME_APPLE_ANS_EARLY_USB is not set These options provide warm-storage and its Kconfig dependencies on both page sizes. kernel/configs/apple-4k/config: # CONFIG_NVME_APPLE_ANS_EARLY_USB is not set These options provide warm-storage and its Kconfig dependencies on both page sizes. Assisted-by: LLM
Assisted-by: LLM
Assisted-by: LLM
Assisted-by: LLM
kernel/configs/apple-16k/config: CONFIG_APPLE_AOP_GYRO=m CONFIG_APPLE_AOP_PRESSURE=m These options provide aop and its Kconfig dependencies on both page sizes. Assisted-by: LLM
Assisted-by: LLM
kernel/configs/apple-16k/config: # CONFIG_NVME_APPLE_ANS_EARLY_USB is not set These options provide warm-storage and its Kconfig dependencies on both page sizes. kernel/configs/apple-4k/config: # CONFIG_NVME_APPLE_ANS_EARLY_USB is not set These options provide warm-storage and its Kconfig dependencies on both page sizes. Assisted-by: LLM
Assisted-by: LLM
Assisted-by: LLM
Assisted-by: LLM
Assisted-by: LLM
This was referenced Nov 8, 2026
Bring this branch onto current main. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
A7-A9 have no EL2 and boot without any PSCI firmware, so Linux on an iPad 5 could not bring secondary CPUs down and up again, and a kexec had nowhere to park them. CPU hotplug, kexec and a clean poweroff all need a PSCI implementation that stays resident after m1n1 hands over. Carry m1n1 patches that keep a small EL3 PSCI implementation resident: CPU_ON/CPU_OFF with a firmware rendezvous (EL1 WFI/WFE trap to EL3), SYSTEM_OFF, and a guarded SYSTEM_RESET that boots the default entry again. The loader marks retained hardware in the device tree after a PSCI re-entry. The resident PSCI is on by default on these SoCs; the shipped boot framing keeps psci_reset=0, so SYSTEM_RESET stays off unless a loader enables it. Adds boot/m1n1/psci-loader and its tests. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
The A9 AOP hosts the accelerometer, gyroscope, pressure and ambient-light sensors. Its firmware needs boot arguments and per-device calibration that m1n1 did not pass on S8003, and a reloaded AOP (after kexec or sleep) lost its sensor firmware state, so the sensors did not come back. m1n1 passes the A9 AOP boot arguments and sensor calibration. The kernel selects a certified AOP reload path through device-tree match data (bindings, DT, mailbox, pmdomain, IIO and AOP driver patches), keeps the AOP power domain and firmware state for that reload, and refuses a suspend that would interrupt the firmware's boot. The J71t firmware recipe gains the AOP pieces, the gyroscope and pressure drivers are enabled, and J71t's accelerometer and gyroscope move from missing to working, and its light sensor from untested to working. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
The TriStar charger subscribed to the PMU's RTC event 16 for source identification. An acknowledgement there could take the RTC's wake event, and the polled cover inputs had no driver enabled. Give RTC event 16 to the RTC alone and keep the PMU and RTC event split (DT, RTC and USB patches), so one consumer's acknowledgement cannot take the other's wake event. Enable KEYBOARD_GPIO_POLLED for the polled cover inputs. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
On J71t the NVMe controller (ANS) sits behind the H9P PCIe port, and resetting that port loses the controller until a cold boot. A kexec therefore has to hand over a stopped but powered ANS, with its DART translations retained, or the next kernel loses its root filesystem. The first version of this handoff panicked when a step failed, which with panic=0 is an indefinite hang. Keep the certified ANS kexec handoff: DT and bindings describe it, the DART, H9P and NVMe drivers stop queues and translations in order and the next kernel picks them up, and core/printk export what the modules need. Every failure on the outgoing side now ends in a native cold reset through apple_cold_reset() instead of a panic, with explicit returns after it. The port is handed over powered, with PERST# asserted and the link stopped, and the incoming kernel brings it up with the cold-boot sequence (port power cycle, NVMe mode, port enable, then link training). Retraining the powered port by PERST# alone, as iOS never does, left the root port in Detect.Quiet and cost a timeout on every warm boot. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
After a kexec the next kernel found the S8000 GPIO controller with interrupt modes armed by the previous kernel, the PIO SPI controller with queued transfers and an asserted chip select, and the touch controller still running. An orphaned GPIO interrupt fires forever and touch did not come back. Retire inherited GPIO interrupt modes before the chained parent interrupts are enabled, drain and idle the S8000 PIO SPI controller on shutdown and at probe, and stop the Apple Z2 touch controller before its SPI parent shuts down. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
A Mac grants an iPad more than the standard USB current, but the charger took the gadget's reported budget unchecked and the composite gadget could draw the extra current while the bus was suspended. Cap and log the USB host budget in the TriStar charger, draw no extra Apple current while suspended, and let the initramfs and orchard USB helpers opt J71t into the Mac current profile. Documented in docs/bring-up/charging/j71t-mac-current.md, with tests. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
The USB serial number changed between installed boots and RAM sessions, so the host saw a new device every boot and could not keep its SSH known_hosts entry or serial console name. Share one BOARD/hashed-ID serial format between installed boots and RAM sessions (usb-identity), and get the per-boot SSH identity through the existing ACM console. Documented in docs/device-protocol.md, with tests. Assisted-by: LLM
Bring this branch onto current main and the series it depends on. The merge keeps the other side's tree; the next commit carries the reworked version of this branch's change.
A warm restart through kexec needs the next kernel to see the pristine device tree from boot, the pstore region, the display state and the power domains that must not be cut while the next kernel starts. DT, OF, DRM, pmdomain and pstore patches retain the board-selected warm handoff state, so probe and shutdown keep what the next kernel needs: the pristine boot device tree, the pstore region, the display state and the Apple pmgr warm hold. The Orchard service file learns the retained state. Assisted-by: LLM
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Part 8 of 23 of the iPad 5 (J71t) series in this repository; merge after #110.
Problem
A warm restart through kexec needs the next kernel to see the pristine device tree from boot, the pstore region, the display state and the power domains that must not be cut while the next kernel starts.
Change
DT, OF, DRM, pmdomain and pstore patches retain the board-selected warm handoff state, so probe and shutdown keep what the next kernel needs: the pristine boot device tree, the pstore region, the display state and the Apple pmgr warm hold. The Orchard service file learns the retained state.
Testing
Dependencies
Depends on #110.
This branch is stacked on the PRs it depends on and carries their commits; the change of this PR is its last commit, "kernel: Retain the tethered warm boot state across kexec".
This update keeps the branch's earlier history: it merges the current base into the branch and adds the reworked change as a new commit on top.
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