A non-transitory machine-readable storage medium encoded with a system firmware,SFW, instance comprising instructions which, when executed by by a blade system (100, 200, 300), the blade system (100, 200, 300) including a compute blade device (140; 240; 340) and an expansion blade device (130; 230; 330), wherein each blade device is a physical computing device that comprises memory and at least one logical processor, and that is mounted in a blade enclosure, and wherein the blade system (100, 200, 300) is to run an operating system with resources of each of the compute blade device (140; 240; 340) and the expansion blade device (130; 230; 330), cause the blade system to: configure each of a compute logical processor (142; 242; 342) of the compute blade device and an expansion logical processor (132; 232; 332) of the expansion blade device (130; 230; 330) to operate as part of a single SFW domain associated with the SFW instance; identify available memory (144; 244; 344) of the compute blade device associated with the compute logical processor and available memory (134; 234; 334) of the expansion blade device associated with the expansion logical processor (132; 232; 332); make available, for use by the operating system, OS, of the blade system (100, 200, 300), the compute logical processor (142; 242; 342) and the identified memory (144; 244; 344) of the compute blade device and the identified memory (134; 234; 334) of the expansion blade device (130; 230; 330); and, in response to determining that the expansion blade device (130; 230; 330) is designated as an expansion blade device, make the expansion logical processor (132; 232; 332) unavailable to the OS such that the expansion logical processor (132; 232; 332) remains available to execute instructions of the SFW instance; wherein the instructions to make the expansion logical processor (132; 232; 332) unavailable comprise instructions that, when executed by the expansion logical processor (132; 232; 332), cause the expansion logical processor (132; 232; 332) to enter a system management mode, SMM, and remain in the SMM while the OS is executed by at least the compute logical processor (142; 242; 342). configure each of a compute logical processor (142; 242; 342) of the compute blade device and an expansion logical processor (132; 232; 332) of the expansion blade device (130; 230; 330) to operate as part of a single SFW domain associated with the SFW instance; identify available memory (144; 244; 344) of the compute blade device associated with the compute logical processor and available memory (134; 234; 334) of the expansion blade device associated with the expansion logical processor (132; 232; 332); make available, for use by the operating system, OS, of the blade system (100, 200, 300), the compute logical processor (142; 242; 342) and the identified memory (144; 244; 344) of the compute blade device and the identified memory (134; 234; 334) of the expansion blade device (130; 230; 330); and, in response to determining that the expansion blade device (130; 230; 330) is designated as an expansion blade device, make the expansion logical processor (132; 232; 332) unavailable to the OS such that the expansion logical processor (132; 232; 332) remains available to execute instructions of the SFW instance;