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46 Checkpoints & Beep Codes
ACPI/ASL Checkpoints
5.3 OEM-Reserved Checkpoint Ranges
Status Code Description
0x01 System is entering S1 sleep state
0x02 System is entering S2 sleep state
0x03 System is entering S3 sleep state
0x04 System is entering S4 sleep state
0x05 System is entering S5 sleep state
0x10 System is waking up from the S1 sleep state
0x20 System is waking up from the S2 sleep state
0x30 System is waking up from the S3 sleep state
0x40 System is waking up from the S4 sleep state
0xAC
System has transitioned into ACPI mode.
Interrupt controller is in PIC mode.
0xAA
System has transitioned into ACPI mode.
Interrupt controller is in APIC mode.
Status Code Description
0x05
OEM SEC initialization before microcode
loading
0x0A OEM SEC initialization after microcode loading
0x1D – 0x2A OEM pre-memory initialization codes
0x3F – 0x4E OEM PEI post memory initialization codes
0x80 – 0x8F OEM DXE initialization codes
0xC0 – 0xCF OEM BDS initialization codes