Abstract: A method for firmware debug trace capture includes creating a hand-off block (“HOB”), capturing first debug trace statements during a boot sequence of a computer and writing the first debug trace statements to the HOB. A trace memory buffer can be created and the first debug trace statements can be copied from the HOB to the trace memory buffer. Second debug trace statements are captured during the boot sequence and appended to the trace memory buffer. In some configurations, the first debug trace statements can be written to the HOB during the pre-Extensible Firmware Interface initialization (“PEI”) phase of the boot sequence and the second debug trace statements can be written to the trace memory buffer during the driver execution (“DXE”) phase of the boot sequence.

Abstract: Technologies are disclosed herein for configuring a system memory of a computer system by determining which, of a plurality, of serial presence detect (SPD) tables to utilize, based at least in part on settings of one or more GPIO pins. The computer system may be available with variations of the configuration of system memory. The SPD tables corresponding to each of the different configurations of the system memory may be stored on the computer system, such as on an NVRAM of the computer system. After identifying the appropriate SPD table, a processor may load the SPD table to a memory reference code of the computer system. In some cases, the state GPIO pins indicating the system memory configuration is set at the time of manufacture of the computer system.

Abstract: A method for firmware debug trace capture includes creating a hand-off block (“HOB”), capturing first debug trace statements during a boot sequence of a computer and writing the first debug trace statements to the HOB. A trace memory buffer can be created and the first debug trace statements can be copied from the HOB to the trace memory buffer. Second debug trace statements are captured during the boot sequence and appended to the trace memory buffer. In some configurations, the first debug trace statements can be written to the HOB during the pre-Extensible Firmware Interface initialization (“PEI”) phase of the boot sequence and the second debug trace statements can be written to the trace memory buffer during the driver execution (“DXE”) phase of the boot sequence.

Abstract: A method for firmware debug trace capture includes creating a hand-off block (“HOB”), capturing first debug trace statements during a boot sequence of a computer and writing the first debug trace statements to the HOB. A trace memory buffer can be created and the first debug trace statements can be copied from the HOB to the trace memory buffer. Second debug trace statements are captured during the boot sequence and appended to the trace memory buffer. In some configurations, the first debug trace statements can be written to the HOB during the pre-Extensible Firmware Interface initialization (“PEI”) phase of the boot sequence and the second debug trace statements can be written to the trace memory buffer during the driver execution (“DXE”) phase of the boot sequence.