This is an internal USB connection which provides RShim connectivity between the BMC and BlueField.
Provides Network Connection from BMC to BlueField DPU
By default, the BMC and BlueField interfaces are configured as follows:
Pushing BFB from BMC to BlueField Arm
To update the software on the BlueField Arm cores, the DPU must be booted up without mounting the eMMC flash device. This requires an external boot flow where a BFB (which includes ATF, UEFI, Linux kernel, and initramfs) is pushed from an external host via USB or PCIe. On BlueField DPUs with an integrated BMC, the USB interface is internally connected to the BMC and is enabled by default. Therefore, you must verify that the RShim driver is running on the BMC. This provides the ability to push a bootstream over the USB interface to perform an external boot.
Changing Default Credentials Using bf.cfg
DPU is ready" message appears in
Attempting to log in before all services are up prints the following message: "Permission denied, please try again."
Alternatively, Ubuntu users can provide a unique password that will be applied at the end of the BFB installation. This password would need to be defined in a
bf.cfg configuration file. To set the password for the ubuntu user:
Create password hash. Run:
Add the password hash in quotes to the
bf.cfgfile will be used with the
bfb-installscript in the following step.
- Minimum password length – 8
- At least one upper-case letter
- At least one lower-case letter
- At least one numerical character
Disable RShim on the host. Run on the host:
Enable RShim on the BMC. Run on the BMC shell:
Verify that the RShim service is running and that the
/dev/rshim0device is present.
The expected output for this command is
Normally, the BFB is first copied to the USB host and then written to the RShim device. However, since the BFB is too big to be stored on the BMC flash or tmpfs, these two steps can be combined, and the image can be written to the RShim device from the remote server directly.
This initiates a soft reset on the BlueField-2 and then pushes the bootstream. For Ubuntu BFBs, the eMMC is flashed automatically once the bootstream is pushed.
bf.cfgis needed as part of the boot process, run: