svn commit: r308532 - head/share/man/man4
Andriy Gapon
avg at FreeBSD.org
Fri Nov 11 15:16:38 UTC 2016
Author: avg
Date: Fri Nov 11 15:16:37 2016
New Revision: 308532
URL: https://svnweb.freebsd.org/changeset/base/308532
Log:
update SMB_BWRITE documentation, clarify SMB_BREAD
After removal of SMB_TRANS some information in the description of
SMB_BWRITE has become stale. E.g., the maximum block size has been
restored to 32.
Also, the descriptions of SMB_BREAD and SMB_BWRITE had some
incorrect information on the SMBus protocol details.
MFC after: 1 week
X-MFC with: r308242
Differential Revision: https://reviews.freebsd.org/D8431
Modified:
head/share/man/man4/smb.4
Modified: head/share/man/man4/smb.4
==============================================================================
--- head/share/man/man4/smb.4 Fri Nov 11 15:13:30 2016 (r308531)
+++ head/share/man/man4/smb.4 Fri Nov 11 15:16:37 2016 (r308532)
@@ -141,26 +141,25 @@ in
.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
More information about the svn-src-all
mailing list