add kernel PPM patch

README.md

@@ -5,7 +5,7 @@
 You can check your FPGA version by doing:
 
 ```
-root@orsXXX:~# AMARISOFT_PATH/trx_sdr/sdr_util version
+root@orsXXX:~# AMARISOFT_INSTALL/trx_sdr/sdr_util version
 SDR board utilities version 2023-09-09, Copyright (C) 2012-2023 Amarisoft
 === Device /dev/sdr0 ===
 Board ID:         0x4b01 (SDR50)
@@ -22,13 +22,19 @@ PCIe bus:         bus=0x01 FPGA PCI gen2 x1 (4.0Gb/s)   OK
 
 Please check "Software version" is 2023-09-09
 
-# Patch your FPGA
+# Upgrade your FPGA
 
-To patch your FPGA, first get the ORS 2023-09-09 bitstream from Rapid.Space, then:
+Do not use the ./sdr_util upgrade from Amarisoft, it will not work for ORS.
+To upgrade your FPGA, first get the ORS 2023-09-09 bitstream from Rapid.Space, then:
 
 ```
 root@orsXXX:~/ors-root-access/flash-fpga# ./init.sh
-root@orsXXX:~/ors-root-access/flash-fpga# ./patch-FPGA.sh
+root@orsXXX:~/ors-root-access/flash-fpga# ./upgrade-FPGA.sh
 ```
 
 Then do a hard reboot by unplugging the ORS and replugging it (make sure not to unplug it from the POE cable)
+
+# Patch your SDR driver
+
+root@orsXXX:~# cd AMARISOFT_INSTALL/trx_sdr
+root@orsXXX:~/AMARISOFT_INSTALL/trx_sdr# patch -p1 kernel/main.c < ~/ors-root-access/kernel-ppm.patch

kernel-ppm.patch

+--- /root/2023-09-14/trx_sdr-linux-2023-09-14/kernel/main.c    2023-09-14 10:06:02.000000000 +0000
++++ kernel/main.c    2024-07-16 14:11:34.257516942 +0000
+@@ -4239,7 +4239,7 @@
+         if (cdcm6208_initialize(s, PROFILE_INTERNAL) < 0)
+             return -1;
+         ss->tcxo_freq = 38400000; /* in Hz */
+-        PPM = 10;
++        PPM = 25;
+     }
+     if (s->has_si5324) {   /* CPRI 10G */
+         if (si5324_init(s, PROFILE_INTERNAL) < 0)