added warning about rfx classic boards and dboard notes

1 files changed, 43 insertions, 1 deletions

diff --git a/host/docs/dboards.rst b/host/docs/dboards.rst
index b39c587f6..7f205c404 100644
--- a/host/docs/dboards.rst
+++ b/host/docs/dboards.rst
@@ -157,7 +157,7 @@ Modification usually involves moving/removing a SMT component
 and burning a new daughterboard id into the eeprom.
 
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
-DBSRX
+DBSRX - Mod
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Due to different clocking capabilities,
@@ -187,3 +187,45 @@ With the daughterboard plugged-in, run the following commands:
 
 * <args> are device address arguments (optional if only one USRP is on your machine)
 * <slot> is the name of the daughterboard slot (optional if the USRP has only one slot)
+
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+RFX - Mod
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Older RFX boards require modifications to use the motherboard oscillator.
+If this is the case, UHD will print a warning about the modification.
+Please follow the modification procedures below:
+
+**Step 1: Disable the daughterboard clocks**
+
+Move R64 to R84, Move R142 to R153
+
+**Step 2: Connect the motherboard blocks**
+
+Move R35 to R36, Move R117 to R115
+These are all 0-ohm, so if you lose one, just short across the appropriate pads
+
+**Step 3: Burn the appropriate daughterboard id into the EEPROM**
+
+With the daughterboard plugged-in, run the following commands:
+::
+
+    cd <prefix>/share/uhd/utils
+    ./usrp_burn_db_eeprom --id=<rx_id> --unit=RX --args=<args> --slot=<slot>
+    ./usrp_burn_db_eeprom --id=<tx_id> --unit=TX --args=<args> --slot=<slot>
+
+* <rx_id> choose the appropriate RX ID for your daughterboard
+
+  * **RFX400:** 0x0024
+  * **RFX900:** 0x0025
+  * **RFX1800:** 0x0034
+  * **RFX1200:** 0x0026
+  * **RFX2400:** 0x0027
+* <tx_id> choose the appropriate TX ID for your daughterboard
+
+  * **RFX400:** 0x0028
+  * **RFX900:** 0x0029
+  * **RFX1800:** 0x0035
+  * **RFX1200:** 0x002a
+  * **RFX2400:** 0x002b
+* <args> are device address arguments (optional if only one USRP is on your machine)
+* <slot> is the name of the daughterboard slot (optional if the USRP has only one slot)