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machine: clarify WriteAt semantics of BlockDevice #5010

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machine: clarify WriteAt semantics of BlockDevice #5010

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5 changes: 5 additions & 0 deletions src/machine/flash.go
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,11 @@ type BlockDevice interface {
io.ReaderAt

// WriteAt writes the given number of bytes to the block device.
//
// This interface directly writes data to the underlying block device.
// Different kinds of devices have different requirements: most can only
// write data after the page has been erased, and many can only write data
// with specific alignment (such as 4-byte alignment).
io.WriterAt

// Size returns the number of bytes in this block device.
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