What: /sys/class/remoteproc/.../firmware
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Date: October 2016
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Contact: Matt Redfearn <matt.redfearn@mips.com>
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Description: Remote processor firmware
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Reports the name of the firmware currently loaded to the
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remote processor.
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To change the running firmware, ensure the remote processor is
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stopped (using /sys/class/remoteproc/.../state) and write a new filename.
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What: /sys/class/remoteproc/.../state
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Date: October 2016
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Contact: Matt Redfearn <matt.redfearn@mips.com>
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Description: Remote processor state
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Reports the state of the remote processor, which will be one of:
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- "offline"
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- "suspended"
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- "running"
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- "crashed"
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- "invalid"
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"offline" means the remote processor is powered off.
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"suspended" means that the remote processor is suspended and
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must be woken to receive messages.
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"running" is the normal state of an available remote processor
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"crashed" indicates that a problem/crash has been detected on
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the remote processor.
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"invalid" is returned if the remote processor is in an
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unknown state.
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Writing this file controls the state of the remote processor.
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The following states can be written:
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- "start"
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- "stop"
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Writing "start" will attempt to start the processor running the
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firmware indicated by, or written to,
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/sys/class/remoteproc/.../firmware. The remote processor should
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transition to "running" state.
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Writing "stop" will attempt to halt the remote processor and
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return it to the "offline" state.
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What: /sys/class/remoteproc/.../name
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Date: August 2019
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KernelVersion: 5.4
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Contact: Suman Anna <s-anna@ti.com>
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Description: Remote processor name
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Reports the name of the remote processor. This can be used by
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userspace in exactly identifying a remote processor and ease
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up the usage in modifying the 'firmware' or 'state' files.
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What: /sys/class/remoteproc/.../coredump
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Date: July 2020
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Contact: Bjorn Andersson <bjorn.andersson@linaro.org>, Ohad Ben-Cohen <ohad@wizery.com>
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Description: Remote processor coredump configuration
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Reports the coredump configuration of the remote processor,
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which will be one of:
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"disabled"
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"enabled"
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"inline"
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"disabled" means no dump will be collected.
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"enabled" means when the remote processor's coredump is
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collected it will be copied to a separate buffer and that
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buffer is exposed to userspace.
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"inline" means when the remote processor's coredump is
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collected userspace will directly read from the remote
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processor's device memory. Extra buffer will not be used to
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copy the dump. Also recovery process will not proceed until
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all data is read by usersapce.
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What: /sys/class/remoteproc/.../recovery
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Date: July 2020
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Contact: Bjorn Andersson <bjorn.andersson@linaro.org>, Ohad Ben-Cohen <ohad@wizery.com>
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Description: Remote processor recovery mechanism
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Reports the recovery mechanism of the remote processor,
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which will be one of:
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"enabled"
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"disabled"
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"enabled" means, the remote processor will be automatically
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recovered whenever it crashes. Moreover, if the remote
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processor crashes while recovery is disabled, it will
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be automatically recovered too as soon as recovery is enabled.
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"disabled" means, a remote processor will remain in a crashed
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state if it crashes. This is useful for debugging purposes;
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without it, debugging a crash is substantially harder.
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