Add UART for linuxes

Signed-off-by: Egor Savkin <es@m-labs.hk>

src/SUMMARY.md

@@ -18,3 +18,4 @@
   - [Sinara 8451 Thermostat](./hw/thermostat.md)
 - [Software/Support](./sw_sup/software_support.md)
   - [Networking](./sw_sup/networking.md)
+  - [UART Logs](./sw_sup/uart_logs.md)

src/sw_sup/networking.md

@@ -13,11 +13,13 @@ a-la `I can't connect, please help`.
 5. Incompatible Ethernet cables/SFP RJ45. Try different cables and SFP adapters. 
    We usually test them with CAT6 cables, but lower categories should be supported too.
 6. SFP or Ethernet are not pushed til the end.
+7. Some weird bugs in Vivado, leading to not working SFP on certain combinations of builds and Kaslis 
 
 ## Ways to diagnose
 
 1. `ping` the device. If destination is unreachable, than it is either didn't connect to the network
     or connected to different address. If the packets just do not respond then it is not as clear, we cannot know all the truth.
-2. UART logs. TODO here is a link to ways to obtain them
-3. `nmap` and `arp` to scan your network to help your Kasli get discovered. May be restricted in your network.
-4. Become a router and capture all the packets when your Kasli tries to connect to the network.
+2. See the SFP0 light
+3. UART logs. TODO here is a link to ways to obtain them
+4. `nmap` and `arp` to scan your network to help your Kasli get discovered. May be restricted in your network.
+5. Become a router and capture all the packets when your Kasli tries to connect to the network.

src/sw_sup/software_support.md

@@ -6,3 +6,5 @@ process, which often includes answering similar questions and solving similar pr
 In the future, it may be revised and added to the official ARTIQ manual.
 
 I hope that helps!
+
+![curious_doge.jpg](../img/curious_doge.jpg)

src/sw_sup/uart_logs.md

@@ -0,0 +1,25 @@
+# UART Logs
+
+Used for network, booting, and most other issues debugging.
+
+## How to get them
+
+First, connect your Kasli/SoC to the PC with a micro-USB cable. Once you turn on the device, wait at least 15 seconds
+until its fully loaded.
+
+### Development shell
+
+1. `flterm /dev/ttyUSBX`, where `X` is usually third (index 2) from suggested variants.
+2. Restart the device with `artiq_flash start`
+3. If it didn't work, try all of `/dev/ttyUSBX`, and restart the device
+
+### Older Nix and other Linuxes
+
+1. Install `cutecom` via `nix-shell -p cutecom` or your package manager
+2. Run `cutecom` and follow settings from the picture: ![uart_cutecom.png](../img/uart_cutecom.png)
+3. Restart the device with `artiq_flash start`, or by power-cycling it (wait 30 seconds before turning on)
+4. If it didn't work, try all of `/dev/ttyUSBX`, and restart the device
+
+### Windows
+
+TODO