PCIe Mode

note

Please install or upgrade sima-cli before continuing. This guide is intended for use with the latest sima-cli version.

Before you begin:

Supported host platform: Ubuntu 22.04 LTS.
Windows 10/11 host support is currently in beta testing.
Configure your host machine's UEFI/BIOS settings for optimal performance and proper driver functionality.
- On Intel-based machines, enable SRIOV, IOMMU, and VT-D.
- On AMD-based machines, disable AMD-V and enable IOMMU.

SiMa.ai MLSoC PCIe card PCIe Dipswitch

On the MLSoC PCIe card, there are four dip switches as shown above. Make sure switch #1 is in OFF position.
Make sure the Run/Program switch is ON.
Power off the host machine, insert the DevKit into the PCIe slot, and power on the host machine.
On the Modalix Early Access PCIe card, keep the DIP switch in its factory-default position.
If the host motherboard provides both a primary (blue) and a non-primary (black) PCIe slot, install the SiMa PCIe card in the secondary (black) slot.
It is recommended to connect the card's serial/UART connector to the host for bring-up and debugging.
The PCIe card also has a physical Ethernet port for direct network access.

For a detailed view of the DevKit interfaces, switches and connectors, refer to the SiMa.ai DevKit Interface.

note

In rare cases, if you do not need the driver to be automatically loaded when the host machine reboots, create (or edit if already exists) /etc/modprobe.d/blacklist.conf and add the line blacklist sima_mla_drv. Once done, run update-initramfs and reboot the host machine. After reboot the drivers can be loaded manually using insmod or modeprobe.

Run the following command on the Linux host to install the latest driver.

sima-user@sima-user-machine:~$ sima-cli install drivers/linux
... ... ...
=== Driver Installation Validation ===
  Component            | Status     | Details
  ----------------------------------------------------------------
  GStreamer            | PASS       | ✅ GStreamer plugin 'pciehost' installed
  Kernel Module        | PASS       | ✅ Kernel module 'sima_mla_drv' installed
  PCI Devices          | PASS       | ✅ Detected SiMa PCIe device(s):
  - 0000:04:00.0 Modalix HHHL v2              driver=sima_mla_drv

✅ Installation complete.

To install a specific driver version, use the -v flag:

sima-user@sima-user-machine:~$ sima-cli install drivers/linux -v 2.1.0

note

After driver installation, power cycle the host machine before validation.

warning

PCIe driver support for the MLSoC PCIe card ended with SDK 2.0.0. The driver installed by the command above supports Modalix only. If you are using an MLSoC PCIe card, install the 2.0.0 driver using sima-cli install drivers/linux -v 2.0.0.

Run the following command on the Windows host to install the driver.

warning

This feature is currently in technical preview. Installing this driver will place the system into driver test-signing mode. You will be prompted to confirm before any system changes are made.

C:\Users\sima> sima-cli install drivers/windows
... ... ...
  ✅ Downloaded: pcie_develop_10082025_2.00.081025.1_B31.exe
  🚀 Running installation script in: C:\Users\sima
  📜 Script: pcie_develop_10082025_2.00.081025.1_B31.exe
  ╭─ Post-Installation Instructions ─╮
  │                                  │
  │  Driver successfully installed   │
  │                                  │
  ╰──────────────────────────────────╯
  ✅ Installation completed successfully.

Check the Windows device manager for the SiMa AI device.

Windows device manager showing SiMa AI device

note

After driver installation, power cycle the host machine before validation.

Run the discovery command to confirm PCIe enumeration:

sima-cli device discover

If setup is correct, the command output will list connected SiMa PCIe device(s).

Virtual Network

note

The Virtual Network feature is available in firmware version 1.5 and later on the Linux host. To use this feature, make sure your DevKit is updated to the latest firmware version.

This feature is only available for the Linux host system.

When connected to a host system via PCI Express (PCIe), the SiMa.ai DevKit establishes a virtual ethernet interface. This interface enables direct network communication between the host and the DevKit over high-speed PCIe bus.

The Virtual Network feature is primarily designed for debugging purposes, allowing users to:

Secure Shell (SSH): Access the DevKit's command-line interface remotely for troubleshooting and system management.
Secure Copy Protocol (SCP): Transfer files between the host and the DevKit securely, facilitating the movement of logs, configurations, and other necessary files during the development and debugging process.

This feature also allows users to:

Update firmware: Manually update firmware using the scp and ssh utilities, when following the File Copy Method.
Assign static IP Address (Ethernet over PCIe): Manually configure static IP address for your host machine/MLSoC device.

By default, 10.0.cardnum.1 address is assigned to the host machine and 10.0.cardnum.2 is assigned to the MLSoC device. However, for stable and consistent networking, you must disable the default IP address being assigned to the host interface by passing the module parameter default_ip=false when loading the module.

If the module is already loaded, remove and then reload it with the default_ip=false parameter, as shown below:

sudo modprobe -r sima_mla_drv
sudo modprobe sima_mla_drv default_ip=false

Persistent Configuration

To ensure the default_ip=false setting persists across system reboots, follow these steps:

Create a modprobe configuration file with the required option:

echo "options sima_mla_drv default_ip=false" | sudo tee /etc/modprobe.d/sima_mla_drv_options.conf

Update the initial RAM filesystem to include the new configuration:
```
sudo update-initramfs -u
```
Reboot the host machine to apply the changes:
```
sudo shutdown -r now
```
After the system restarts, verify that the parameter is correctly set:
```
cat /sys/module/sima_mla_drv/parameters/default_ip
```

Manual IP Assignment

When loading the module manually (using insmod), use the command below. This allows you to manually assign a static IP address to the host machine interface and in turn to the MLSoC device.

sudo insmod sima_mla_drv.ko default_ip=false

This also requires the host machine to have ifconfig utility installed.

ifconfig <eth interface> 20.1.2.1

Once an IP address is assigned to the host interface, IP + 1 will be assigned to SoC interface automatically. For example, if 20.1.2.1 is assigned to the host machine, the MLSoC IP will be 20.1.2.2.

When the interfaces are created, the host interface will have a MAC address in the format cardnum:S:I:m:A:0 and the SoC interface will have a MAC address of cardnum:S:I:m:A:1. The IP addresses are assigned upon creation as host:10.0.cardnum.1 and soc:10.0.cardnum.2. This also requires the host machine to have ifconfig utility installed.

ifconfig output on the host machine:

enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 65536
    inet 10.0.0.1  netmask 255.255.255.0  broadcast 10.0.0.255
    inet6 fe80::253:49ff:fe4d:4130  prefixlen 64  scopeid 0x20<link>
    ether 00:53:49:4d:41:30  txqueuelen 1000  (Ethernet)
    RX packets 14107  bytes 4460994 (4.4 MB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 818  bytes 74840 (74.8 KB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ifconfig output on the SiMa.ai DevKit:

eth2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 65536
    inet 10.0.0.2  netmask 255.255.255.0  broadcast 10.0.0.255
    inet6 fe80::253:49ff:fe4d:4131  prefixlen 64  scopeid 0x20<link>
    ether 00:53:49:4d:41:31  txqueuelen 1000  (Ethernet)
    RX packets 818  bytes 74840 (73.0 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 14109  bytes 4461636 (4.2 MiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

SSH from host to device; use default user name sima and password edgeai to connect.

sima-user@sima-user-machine:~$ ssh sima@10.0.0.2
The authenticity of host '10.0.0.2 (10.0.0.2)' can't be established.
ED25519 key fingerprint is SHA256:ulxwiRM+cCQNJ90R5Qn5eV+9hqvkVNo0eWQ9pY3l8E0.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.0.0.2' (ED25519) to the list of known hosts..
sima@10.0.0.2's password:
sima@davinci:~#

Virtual Network​

Virtual Network