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Index: share/man/man4/smb.4
===================================================================
--- share/man/man4/smb.4
+++ share/man/man4/smb.4
@@ -141,26 +141,25 @@
.Em BlockWrite
first sends the byte from
.Fa cmd
-to the device, followed by
+to the device, then the byte from
+.Fa wcount
+followed by
.Fa wcount
bytes of data that are taken from the buffer pointed to by
.Fa wbuf .
The SMBus specification mandates that no more than 32 bytes of
-data can be transferred in a single block read or write command,
-but since
-.Xr smbus 4
-is also used to access I2C devices, the limit has been increased
-to 1024.
+data can be transferred in a single block read or write command.
This value can be read from the constant
.Dv SMB_MAXBLOCKSIZE .
.It Dv SMB_BREAD Ta
.Em BlockRead
first sends the byte from
.Fa cmd
-to the device, then reads
-.Fa rcount
-bytes of data that from the device.
-This data is returned in the buffer pointed to by
+to the device, then reads a count of data bytes that the device
+is going to provide and then reads that many bytes.
+The count is returned in
+.Fa rcount.
+The data is returned in the buffer pointed to by
.Fa rbuf .
.El
.Pp

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