# GRMON Evaluation Version UART debug no long working?

**URL:** <https://discourse.grlib.community/t/grmon-evaluation-version-uart-debug-no-long-working/183>\
**Category:** General - Software\
**Created:** [1 August 2021 20:35 UTC](https://discourse.grlib.community/t/grmon-evaluation-version-uart-debug-no-long-working/183 "2021-08-01T20:35:50Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![lcvisser](https://avatars.discourse-cdn.com/v4/letter/l/a5b964/32.png) [@lcvisser](https://discourse.grlib.community/u/lcvisser)\
**Post date:** [1 August 2021 20:35 UTC](https://discourse.grlib.community/t/grmon-evaluation-version-uart-debug-no-long-working/183/1 "2021-08-01T20:35:50Z")

</div>

I just went from GRMON v3.2.11.1 to v3.2.13. I used to connect to my board with the command:

```auto
grmon -digilent -u

```

and then run a program, e.g.

```auto
grmon3> reset
grmon3> load myprogram.elf
grmon3> run

```

With v3.2.13 the exact same commands presents me with:

```auto
grmon3> run
  Debug support disabled!

```

What did I miss?

I’m using the open source version of GRLIB: Leon3 on a Digilent Arty-A7.

---

<div class="post-metadata">

**Author:** ![lcvisser](https://avatars.discourse-cdn.com/v4/letter/l/a5b964/32.png) [@lcvisser](https://discourse.grlib.community/u/lcvisser)\
**Post date:** [2 August 2021 19:29 UTC](https://discourse.grlib.community/t/grmon-evaluation-version-uart-debug-no-long-working/183/2 "2021-08-02T19:29:02Z")

</div>

For what it’s worth: no debug-related command seems to work: `disassemble`, `go`, `run` all give the same error “Debug support disabled!”. `bp`-related commands give me “Invalid CPU!”.

I’ve pasted below the initial output of GRMON and the output of `info sys`. I see that `dsu0` is disabled, but I don’t recall having changed anything to the board itself, and toggling switch 3 (DSU enable according to the design’s README) doesn’t change anything.

```auto
$ grmon -digilent -u

  GRMON debug monitor v3.2.13 64-bit eval version
  
  Copyright (C) 2021 Cobham Gaisler - All rights reserved.
  For latest updates, go to http://www.gaisler.com/
  Comments or bug-reports to support@gaisler.com
  
  This eval version will expire on 24/12/2021

JTAG chain (1): xc7a35t 
  GRLIB build version: 4261
  Detected frequency: 83.0 MHz
  
  Component Vendor
  LEON3 SPARC V8 Processor Cobham Gaisler
  JTAG Debug Link Cobham Gaisler
  GR Ethernet MAC Cobham Gaisler
  SPI Memory Controller Cobham Gaisler
  AHB/APB Bridge Cobham Gaisler
  LEON3 Debug Support Unit Cobham Gaisler
  Xilinx MIG Controller Cobham Gaisler
  Generic UART Cobham Gaisler
  Multi-processor Interrupt Ctrl. Cobham Gaisler
  Modular Timer Unit Cobham Gaisler
  AMBA Wrapper for OC I2C-master Cobham Gaisler
  SPI Controller Cobham Gaisler
  General Purpose I/O port Cobham Gaisler
  General Purpose I/O port Cobham Gaisler
  General Purpose I/O port Cobham Gaisler
  
  Use command 'info sys' to print a detailed report of attached cores

grmon3> info sys
  cpu0 Cobham Gaisler LEON3 SPARC V8 Processor    
            AHB Master 0
  ahbjtag0 Cobham Gaisler JTAG Debug Link    
            AHB Master 1
  greth0 Cobham Gaisler GR Ethernet MAC    
            AHB Master 2
            APB: 80000f00 - 80001000
            IRQ: 12
            edcl ip 192.168.0.175, buffer 16 kbyte
  spim0 Cobham Gaisler SPI Memory Controller    
            AHB: fff00000 - fff80000
            AHB: 00000000 - 20000000
            IRQ: 10
            SPI memory device read command: 0x0b
  apbmst0 Cobham Gaisler AHB/APB Bridge    
            AHB: 80000000 - 80100000
  dsu0 Cobham Gaisler LEON3 Debug Support Unit    
            AHB: 90000000 - a0000000
            Device is disabled
  mig0 Cobham Gaisler Xilinx MIG Controller    
            AHB: 40000000 - 50000000
            APB: 80000500 - 80000600
            SDRAM: 128 Mbyte
  uart0 Cobham Gaisler Generic UART    
            APB: 80000100 - 80000200
            IRQ: 2
            Baudrate 38425, FIFO debug mode available
  irqmp0 Cobham Gaisler Multi-processor Interrupt Ctrl.    
            APB: 80000200 - 80000300
  gptimer0 Cobham Gaisler Modular Timer Unit    
            APB: 80000300 - 80000400
            IRQ: 8
            8-bit scalar, 2 * 32-bit timers, divisor 83
  i2cmst0 Cobham Gaisler AMBA Wrapper for OC I2C-master    
            APB: 80000400 - 80000500
            IRQ: 3
  spi0 Cobham Gaisler SPI Controller    
            APB: 80000600 - 80000700
            IRQ: 5
            FIFO depth: 4, 1 slave select signals
            Maximum word length: 32 bits
            Controller index for use in GRMON: 0
  gpio0 Cobham Gaisler General Purpose I/O port    
            APB: 80000900 - 80000a00
            IRQ: 4
  gpio1 Cobham Gaisler General Purpose I/O port    
            APB: 80000a00 - 80000b00
            IRQ: 6
  gpio2 Cobham Gaisler General Purpose I/O port    
            APB: 80000b00 - 80000c00
            IRQ: 7
  

```