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--- doc:appunti:hardware:qnap_ts-120 [2022/02/11 09:34] – [Console seriale] niccolo
+++ doc:appunti:hardware:qnap_ts-120 [2022/02/12 07:04] – [Serial Console] niccolo
@@ Line 95: / Line 95: @@
 </code>
-===== Console seriale =====
+===== The Serial Console =====
-Vedere qui: [[http://www.cyrius.com/debian/kirkwood/qnap/ts-119/serial/]]
+{{ .:qnap:qnap-ts-120-serial-console-jtag.jpg?direct&400|QNAP TS-120: Console connector}}
+{{ .:qnap:qnap-ts-120-serial-console-closeup.jpg?direct&160|Serial Console JTAG Connector}}
+On the circuit board of the QNAP TS-120 there is a JTAG connector for the serial console. I used an old CD-ROM audio cable because it had the right connector. I wired only the **GND**, **TX** and **RX** pins from to QNAP to a serial-to-USB adapter. The adapter was inserted intp a GNU/Linux computer running the **minicom** program. The speed of the serial line was set to **115200**. The connector pinout is documented in this page: [[http://www.cyrius.com/debian/kirkwood/qnap/ts-119/serial/|Serial console for QNAP TS-11x/TS-12x]].
-I connect only the **GND**, **TX** and **RX** pins from QNAP to a serial-to-USB adapter. The speed was set to **115200**.
+^ Console Pinout  ^^
+^ 1  | TX        |
+^ 2  | VCC +3.3  |
+^ 3  | RX        |
+^ 4  | GND       |
+This is the boot process captured from the serial line:
-===== Tips =====
+<code>
+         __  __                      _ _
+        |  \/  | __ _ _ ____   _____| | |
+        | |\/| |/ _` | '__\ \ / / _ \ | |
+        | |  | | (_| | |   \ V /  __/ | |
+        |_|  |_|\__,_|_|    \_/ \___|_|_|
+ _   _     ____              _
+| | | |   | __ )  ___   ___ | |_
+| | | |___|  _ \ / _ \ / _ \| __|
+| |_| |___| |_) | (_) | (_) | |_
+ \___/    |____/ \___/ \___/ \__|  ** LOADER **
+ ** MARVELL BOARD: DB-88F6282A-BP LE TS-120 ,PHY=1.8v
+U-Boot 1.1.4 (Nov  5 2012 - 17:39:47) Marvell version: 3.5.3
+U-Boot code: 00600000 -> 0067FFF0  BSS: -> 006CD5C0
+Soc: MV88F6282 Rev 1CPU running @ 1600Mhz L2 running @ 533Mhz
+SysClock = 533Mhz , TClock = 200Mhz
+</code>
+===== Real Time Clock rtc0 =====
 Into the QNAP TS-120 there is a Real Time Clock. You can see the battery on the motherboard and the kernel will print this on the serial console:
 <code>
-hctosys: unable to open rtc device (rtc0)
+[    1.262622] hctosys: unable to open rtc device (rtc0)
-rtc-s35390a 0-0030: rtc core: registered rtc-s35390a as rtc0
+[    1.628724] rtc-s35390a 0-0030: rtc core: registered rtc-s35390a as rtc0
 </code>
-FIXME Why hctosys is started before the rtc0 device becomes available? Is it a problem? Can it be fixed?
+The problem is that the rtc support is **compiled as a module** and the kernel executes **hctosys** before the module is loaded, so before the **rtc0** device is available. When the **rtc0** device becomes available, the **udev** subsystem is triggered by the file **/usr/lib/udev/rules.d/85-hwclock.rules**. The rule says to run the script **/usr/lib/udev/hwclock-set**.
+Historically that script does nothing if **systemd** is running, because it assumes that the system clock was already set from the hardware clock. See Debian bug **[[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855203|#855203 - hwclock-set: Synchronize from hwclock despite systemd presence]]**.
+A quick and dirty solution is to edit the script **/lib/udev/hwclock-set** removing the systemd check:
+<code>
+#if [ -e /run/systemd/system ] ; then
+#    exit 0
+#fi
+</code>
+You should also comment-out the **hwclock** commands containing the **%%--systz%%** option, (from the man page: "//It is intended to be used in a startup script on systems with kernels above version 2.6 where you know the System Clock has been set from the Hardware Clock by the kernel during boot//"):
+<code>
+  #/sbin/hwclock --rtc=$dev --systz --badyear
+...
+  #/sbin/hwclock --rtc=$dev --systz
+</code>
 ===== Upgrading to 4 Tb Hard Disk =====