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hostfs: Document the backends and restrictions

This commit is contained in:
YAMAMOTO Takashi 2021-03-11 11:04:00 +09:00 committed by Xiang Xiao
parent a063974df2
commit 8d33f7adee
1 changed files with 21 additions and 0 deletions
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21
fs/hostfs/Kconfig
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@ -19,6 +19,24 @@ config FS_HOSTFS
be passed to the 'mount()' routine using the optional 'void *data'
parameter.
The backend implementation is arch-dependent.
As of writing this, it's implemented for sim, arm and xtensa.
Note: depending on the backend implementions, hostfs might
only provide very restricted subset of filesystem operations.
Sim: It's implemented with direct calls to the host OS API.
It likely consumes a lot of stack than ordinary NuttX codebase.
You likely need to make task stack sizes huge (e.g. 64KB) to
avoid stack overrun.
Arm, xtensa: It's implemented using a special CPU instruction
to trigger a trap for a hypervisor.
If you are using qemu, it has the `-semihosting` command line
option to enable the handling of the trap.
Theoretically, it can work for other environments as well.
E.g. a real hardware + JTAG + OpenOCD.
config FS_HOSTFS_RPMSG
bool "Host File System Rpmsg"
default n
@ -28,6 +46,9 @@ config FS_HOSTFS_RPMSG
Use Host file system to mount directories through rpmsg.
This is the driver that sending the message.
This effectively replaces the ordinary hostfs backend.
Right now, there is no way to enable both backends.
config FS_HOSTFS_RPMSG_SERVER
bool "Host File System Rpmsg Server"
default n