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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/library/os.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/library/os.rst b/docs/library/os.rst index a1eae4f24..19652ee2b 100644 --- a/docs/library/os.rst +++ b/docs/library/os.rst @@ -314,6 +314,12 @@ that the block device supports the extended interface. ``ioctl(6, ...)`` must also be intercepted. The need for others is hardware dependent. + Prior to any call to ``writeblocks(block, ...)`` littlefs issues + ``ioctl(6, block)``. This enables a device driver to erase the block + prior to a write if the hardware requires it. Alternatively a driver + might intercept ``ioctl(6, block)`` and return 0 (success). In this case + the driver assumes responsibility for detecting the need for erasure. + Unless otherwise stated ``ioctl(op, arg)`` can return ``None``. Consequently an implementation can ignore unused values of ``op``. Where ``op`` is intercepted, the return value for operations 4 and 5 are as |