You can use the OpenBoot probe-nvme-all command to list all the flash accelerator devices (sometimes referred to as NVMe) in a system. The information displayed can provide the information you need to set one of the devices as the boot device.
In this example, a server with one physical domain has two factory installed flash accelerator cards. The lowest numbered card contains the preinstalled Oracle Solaris OS software. The lowest-numbered card has the /pci@301/pci@1/nvme@0 device path.
{0} ok probe-nvme-all /pci@315/pci@1/nvme@0 NVME Controller VID: 8086 SSVID: 108e SN:CVMD512100AA1P6N MN: INTEL SSDPEDME016T4S FR: 8DV1RA13 NN: 1 Namespace ID:1 Size: 1.600 TB /pci@301/pci@1/nvme@0 NVME Controller VID: 8086 SSVID: 108e SN:CVMD512100F81P6N MN: INTEL SSDPEDME016T4S FR: 8DV1RA13 NN: 1 Namespace ID:1 Size: 1.600 TB