dev_jmb39x_raid.cpp: Enhance LBA range from 33-62 to 1-255 (#1594).

smartctl.8.in: Update related documentation.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk@5366 4ea69e1a-61f1-4043-bf83-b5c94c648137

smartmontools/ChangeLog

 $Id$
 
+2022-04-30  Christian Franke  <franke@computer.org>
+
+	dev_jmb39x_raid.cpp: Enhance LBA range from 33-62 to 1-255 (#1594).
+	smartctl.8.in: Update related documentation.
+
 2022-04-27  Gabriele Pohl  <contact@dipohl.de>
 
 	drivedb.h:

smartmontools/dev_jmb39x_raid.cpp

@@ -3,7 +3,7 @@
  *
  * Home page of code is: https://www.smartmontools.org
  *
- * Copyright (C) 2019-21 Christian Franke
+ * Copyright (C) 2019-22 Christian Franke
  *
  * Based on JMraidcon (same license):
  *   Copyright (C) 2010 Werner Johansson
@@ -729,8 +729,8 @@ ata_device * smart_interface::get_jmb39x_device(const char * type, smart_device
     force = true;
     n1 += n2;
   }
-  if (!(n1 == len && port <= 4 && 33 <= lba && lba <= 62)) {
-    set_err(EINVAL, "Option -d %s,N[,sLBA][,force] must have 0 <= N <= 4 [, 33 <= LBA <= 62]", prefix);
+  if (!(n1 == len && port <= 4 && 1 <= lba && lba <= 255)) {
+    set_err(EINVAL, "Option -d %s,N[,sLBA][,force] must have 0 <= N <= 4 [, 1 <= LBA <= 255]", prefix);
     return 0;
   }
 

smartmontools/smartctl.8.in

@@ -729,11 +729,17 @@ some QNAP NAS devices.
 The integer N is the port number from 0 to 4.
 .br
 \fBWARNING: The ATA pass-through commands are issued via READ/WRITE commands
-to LBA 33 of the RAID volume.
+to a LBA of the RAID volume.
 Using this option with other devices may overwrite this sector.\fP
 .br
-The LBA could be selected in the range 33 (last sector of a GPT) to 62 (last
-sector of traditional boot area).
+The default LBA is 33.
+The LBA could be selected in the range from 1 to 255 inclusive.
+.br
+If a GPT partition table is used, LBA 33 contains the last 4 (of 128)
+entries of the partition table.
+These entries are zero filled in most cases.
+If a MBR partition table is used, LBA 33 may be zero filled or may contain
+code from a boot loader.
 .br
 By default, access to the device is refused if the selected sector is not
 zero filled.