[J-core] New Numato Mimas, no serial output from boot loader or Linux

[Brian Bartholomew]

My Numato Mimas arrived today, and I'm following the recipe at
http://j-core.org/ to load it with Linux.  Below is a reconstruction
of what I've tried.  The results I saw matched the tutorial until the
"Hook up a serial console" step, where I saw no output, no "CPU tests
passed", nothing, with or without an sdcard inserted.  The switch is
towards the VGA connector.

The Dell laptop I'm doing this from is running Ubuntu 14.04.

$ sudo -i
root$ service modemmanager stop
root$ sudo apt-get purge modemmanager
root$ sudo apt-get install python3 python3-serial
root$ sudo apt-get install microcom

$ md5sum mimas_v2.bin vmlinux 
390768a7ef9061a19f163061c4e15ac3  mimas_v2.bin
cebf48571838f9cad0df9e3041ca28b2  vmlinux

Lines from dmesg:

[88266.084718] usb 1-1.2: new full-speed USB device number 49 using ehci-pci
[88266.182025] usb 1-1.2: New USB device found, idVendor=2a19, idProduct=1002
[88266.182065] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[88266.182082] usb 1-1.2: Product: Numato Lab Mimas V2 Spartan6 FPGA Development Board
[88266.182097] usb 1-1.2: Manufacturer: Numato Systems Pvt. Ltd.
[88266.183284] cdc_acm 1-1.2:1.0: This device cannot do calls on its own. It is not a modem.
[88266.183381] cdc_acm 1-1.2:1.0: ttyACM0: USB ACM device
[88330.709408] usb 1-1.2: USB disconnect, device number 49

$ sudo python3 MimasV2Config.py /dev/ttyACM0 mimas_v2.bin
****************************************
* Numato Lab Mimas V2 Configuration Tool *
****************************************
Micron M25P16 SPI Flash detected
Loading file mimas_v2.bin...
Erasing flash sectors...
Writing to flash 100% complete...
Verifying flash contents...
Flash verification successful...
Booting FPGA...
Done.

Copied vmlinux onto a 32 GB sdcard, I believe it was factory formatted
with a DOS-type filesystem.

Now with flash loaded and the sdcard inserted containing vmlinux, I
see this after powerup:

	blue LED on
	blue LED off
	888 on 7-segment and 3 green LEDs on
	green LEDs off
	middle 7-segment counts from 0 to 9
	--- on 7-segment

Meanwhile, no output after the terminal program connects:

$ stty -F /dev/ttyACM0 -crtscts && microcom -s 115200 /dev/ttyACM0
connected to /dev/ttyS0
Escape character: Ctrl-\
Type the escape character followed by c to get to the menu or q to quit

Thank you,
Brian