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