In dmidecode types0   BIOS Information1   System Information2   Baseboard (or Module) InformationWhat is the second entry? For exmaple, First is for bios, second for Motherboard. What does System here mean? CPU?The man page says:dmidecode  is  a  tool  for  dumping  a  computer's DMI (some say         SMBIOS) table contents in a  human-readable  format.  This  table         contains  a  description  of the system's hardware components, as         well as other useful pieces of information such as serial numbers         and  BIOS  revision.  Thanks to this table, you can retrieve this         information without having to  probe  for  the  actual  hardware.         While this is a good point in terms of report speed and safeness,         this also makes the presented information possibly unreliable.dmidecode -t system' didn't help either:[root@localhost ~]# dmidecode -t system\# dmidecode 2.12SMBIOS 2.4 present.Handle 0x0001, DMI type 1, 27 bytesSystem Information    Manufacturer:                                      Product Name:                                      Version:                                      Serial Number:                                      UUID: 89CFC20E-41D1-11DF-8DA9-001CC0C1735C    Wake-up Type: Power Switch    SKU Number: Not Specified    Family: Not SpecifiedHandle 0x0028, DMI type 12, 5 bytesSystem Configuration Options    Option 1: To Be Filled By O.E.M.Handle 0x0030, DMI type 32, 20 bytesSystem Boot Information    Status: No errors detected
dmidecode - what is the system?
linux;bios;dmidecode
system refers to the entire box.If you buy a pre-assembled computer with a specific model name, the vendor would put that information into the system block. If you buy components and assemble them yourself, that information remains empty.